# High-volume energy drinks · Gap in direct evidence for increased clinical arrhythmia

Verdict 2961 · Evidence Check

Stored-material review date: Not recorded  
Original evidence cut-off: 2026-08-26  
Review-criteria version: 1.0  
Public page/material preparation date: 2026-10-12

Clinical papers were not read directly; existing review summaries were checked. No new clinical-literature search was performed. Unverified does not mean that research is absent or that there is no effect.

## Assessment scope

- Population: 2019 biomarker trial: 34 healthy adults aged 18–40 without cardiovascular disease, hypertension, QT prolongation or regular medication use. Direct clinical-event populations/denominators are unverified.
- Ingredient, formulation and route: Single intake within one hour of 946 mL of energy drink containing about 300–320 mg caffeine
- Dose: Original research exposure: 946 mL, about 300–320 mg caffeine, one exposure within one hour. Actual composition/intake completion and long-term exposure are unverified; this is not dosing guidance.
- Comparator: 2019 within-person crossover of commercial drinks A/B versus placebo. Placebo composition/caffeine, effective n by condition and model details are unverified. The 2017 energy-drink-versus-caffeine comparison is a separate qualitative bibliography.
- Measured outcome: The selected question concerns directly increased clinical arrhythmia. Original grade ?, and no testing in the four-hour trial. Event definitions, verification, numerators/denominators, effects/intervals and direct follow-up are unverified.
- Duration: 2019 measurements every 30 minutes through 240 minutes after intake. Crossover visits/washout and actual clinical-event/long-term-risk observation are unverified.
- Questions outside this scope: Transferring QTc/blood-pressure biomarker changes to occurrence of clinical arrhythmia, hospitalization or death; Converting/calculating condition-specific QTc maxima into between-group differences or ± into CIs; Creating new blood-pressure quantities, clusters/conditions/denominators or zero clinical events; Interpreting the 10-ms power assumption as a clinical-arrhythmia threshold/effect; Copying 2019 n/effects/NCT/support disclosures to 2017/Mayo; Certifying author overlap as an identical cohort or earlier/blood-pressure descriptions as independent clinical-event replication; Summing participants/trials across two checklists, reports, conditions or time points; Creating long-term/small-dose/adolescent/disease-medication population benefits/harms or intake/prevention/treatment procedures

## Checklist items

### N01 · What is the original direction of the selected existing question?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The selected existing question is “Increased clinical arrhythmia,” distinguished from its subclaim verdict record. The original wording of the question about increased clinical events is retained.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. No new independent-claim certification, invented verdict or subclaim subdivision was made.
- Reason for missing information: No new independent-claim certification, invented verdict or subclaim subdivision was made.
- Required materials and conditions: Exact subclaim wording, Korean/English text and question/record relationship
- Materials to obtain first: Selected existing verdict record and complete parent summary
- Further research: If the question changes, retain the original existing wording, previous complete version and change event separately.
- Conditions for verification: Connect Exact subclaim wording, Korean/English text and question/record relationship to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Exact subclaim wording, Korean/English text and question/record relationship.
- Application exceptions: Do not count trials, participants or clinical events twice because two existing checklists were prepared.
- Remaining uncertainty: Preparation scope of the stored summary. No new independent-claim certification, invented verdict or subclaim subdivision was made.
- Referenced methods: Question-clarification principles in M03 §3.1, §3.2.1–3.2.4; detailed separation rules are our own design
- Related sources: R01

### N02 · How do the subclaim verdict and parent score/axes differ?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The subclaim is ?, with the note “The four-hour trial did not test clinical arrhythmia.” It has no score/status/axes fields. Parent D30, Caution and B/S/R1/I2/E-/B2/C0 are parent context.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Subclaim score/status/assessment axes are null; parent values are not inserted.
- Reason for missing information: Subclaim score/status/assessment axes are null; parent values are not inserted.
- Required materials and conditions: Actual subclaim grade/note, absent score/status/axes and parent D30
- Materials to obtain first: Original subclaim record and parent grade/score/axes and assessment history
- Further research: When evidence is updated, distinguish original value preservation from actual judgment events.
- Conditions for verification: Connect Actual subclaim grade/note, absent score/status/axes and parent D30 to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Actual subclaim grade/note, absent score/status/axes and parent D30.
- Application exceptions: Do not inherit parent D30 or historical cross-checks as a subclaim score, current content-review pass or new independence certification.
- Remaining uncertainty: Preparation scope of the stored summary. Subclaim score/status/assessment axes are null; parent values are not inserted.
- Referenced methods: M03 §3.1, §3.2.1–3.2.4 question-clarification principles; detailed separation rules are internally designed; M04 §4.5, §4.6.3; limits of this material conversion follow the review scope and internal design
- Related sources: R01

### N03 · What are the actual trial population and applicability boundaries?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The 2019 trial involved 34 healthy adults aged 18–40 without cardiovascular disease, hypertension, QT prolongation or regular medication use.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Detailed recruitment, sex, baseline QTc/blood pressure, caffeine habits, inclusion/exclusion and actual outcome population n are unverified.
- Reason for missing information: Detailed recruitment, sex, baseline QTc/blood pressure, caffeine habits, inclusion/exclusion and actual outcome population n are unverified.
- Required materials and conditions: Healthy adults aged 18–40, baseline exclusions and selected population
- Materials to obtain first: Recruitment/baseline characteristics, eligibility and outcome-specific flow
- Further research: Distinguish other population materials by baseline risk, medication, age and actual eligibility.
- Conditions for verification: Connect Healthy adults aged 18–40, baseline exclusions and selected population to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Healthy adults aged 18–40, baseline exclusions and selected population.
- Application exceptions: Do not extend the healthy young population to adolescents, patients, regular medication users or all consumers.
- Remaining uncertainty: Preparation scope of the stored summary. Detailed recruitment, sex, baseline QTc/blood pressure, caffeine habits, inclusion/exclusion and actual outcome population n are unverified.
- Referenced methods: M03 §3.2.1; detailed population conditions are Chamgap's own design
- Related sources: R01

### N04 · What are the actual identity and duration of the research exposure?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The original exposure was a single intake of 946 mL of energy drink containing about 300–320 mg caffeine within one hour.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Actual individual intake/completion, full composition, batches, other exposure and adherence are unverified.
- Reason for missing information: Actual individual intake/completion, full composition, batches, other exposure and adherence are unverified.
- Required materials and conditions: 946 mL, about 300–320 mg caffeine and one exposure within one hour
- Materials to obtain first: Product composition, actual exposure, intake completion and crossover records
- Further research: Connect nominal/actual and product-specific exposure differences with the relevant outcome.
- Conditions for verification: Connect 946 mL, about 300–320 mg caffeine and one exposure within one hour to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 946 mL, about 300–320 mg caffeine and one exposure within one hour.
- Application exceptions: Do not calculate or create can counts, caffeine equivalents, safe limits or intake/manufacturing/dosing guidance.
- Remaining uncertainty: Preparation scope of the stored summary. Actual individual intake/completion, full composition, batches, other exposure and adherence are unverified.
- Referenced methods: M03 §3.2.2–3.2.3; reverse labeling and test adaptations are Chamgap's own design
- Related sources: R01

### N05 · What are the identity and composition differences of drinks A/B and placebo?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary records investigators preparing commercial drinks in identical containers and participants consuming A, B and placebo separately.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Brands, quantities of A/B ingredients, placebo caffeine/calories/sugar, matching taste/appearance and separate effects of non-caffeine ingredients are unverified.
- Reason for missing information: Brands, quantities of A/B ingredients, placebo caffeine/calories/sugar, matching taste/appearance and separate effects of non-caffeine ingredients are unverified.
- Required materials and conditions: Commercial products A/B, preparation in identical containers and placebo composition
- Materials to obtain first: Trial product/placebo composition, preparation and distinguishability
- Further research: If actual product materials are provided, distinguish caffeine, combined ingredients and placebo differences.
- Conditions for verification: Connect Commercial products A/B, preparation in identical containers and placebo composition to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Commercial products A/B, preparation in identical containers and placebo composition.
- Application exceptions: Do not use the 2017 caffeine-comparison title to verify that the 2019 placebo was caffeine-matched.
- Remaining uncertainty: Preparation scope of the stored summary. Brands, quantities of A/B ingredients, placebo caffeine/calories/sugar, matching taste/appearance and separate effects of non-caffeine ingredients are unverified.
- Referenced methods: M03 §3.2.2–3.2.3; Reverse-direction labels and assessment adaptation are Chamgap design; M03 §3.2.3 and M08 §8.2.2–8.2.3; Chamgap application
- Related sources: R01

### N06 · How do 240-minute measurements differ from long-term observation?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The 2019 trial measured QTc and blood pressure every 30 minutes through 240 minutes after a single exposure.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Intervals/washout between crossover visits, complete actual follow-up, subsequent event collection and repeated/long-term intake are unverified.
- Reason for missing information: Intervals/washout between crossover visits, complete actual follow-up, subsequent event collection and repeated/long-term intake are unverified.
- Required materials and conditions: Measurements through 240 minutes, 30-minute intervals and acute time points
- Materials to obtain first: Visit/washout schedule, outcome collection and event follow-up scope
- Further research: Distinguish actual observation durations of acute biomarkers and long-term clinical outcomes in follow-up materials.
- Conditions for verification: Connect Measurements through 240 minutes, 30-minute intervals and acute time points to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Measurements through 240 minutes, 30-minute intervals and acute time points.
- Application exceptions: Do not convert four hours into sufficient clinical-event testing duration or long-term safety.
- Remaining uncertainty: Preparation scope of the stored summary. Intervals/washout between crossover visits, complete actual follow-up, subsequent event collection and repeated/long-term intake are unverified.
- Referenced methods: M03 §3.2.4, M15 §15.3.1–15.3.3; Question-specific outcome adaptations are designed by CHAMGAP; Design-specific harm questions in M19 §19.2; Detailed temporal relationships are internally designed
- Related sources: R01

### N07 · What are the sequence and analysis units of the crossover trial?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The recorded design is a randomized double-masked placebo-controlled crossover trial; the same participants underwent each drink condition.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Sequence-specific n, sequence generation/concealment, washout, carryover, period/sequence models and effective n by condition are unverified.
- Reason for missing information: Sequence-specific n, sequence generation/concealment, washout, carryover, period/sequence models and effective n by condition are unverified.
- Required materials and conditions: A/B/placebo in the same 34 people, sequence allocation and carryover/period effects
- Materials to obtain first: Crossover flow, sequence/period and original analysis model
- Further research: When materials are supplemented, distinguish conditions/time points within the same person and crossover assumptions.
- Conditions for verification: Connect A/B/placebo in the same 34 people, sequence allocation and carryover/period effects to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of A/B/placebo in the same 34 people, sequence allocation and carryover/period effects.
- Application exceptions: Do not sum A/B/placebo, repeated time points or two checklists as independent participants/trials.
- Remaining uncertainty: Preparation scope of the stored summary. Sequence-specific n, sequence generation/concealment, washout, carryover, period/sequence models and effective n by condition are unverified.
- Referenced methods: M08 §8.1–8.2.3; CHAMGAP adaptation; Distinction between studies and reports in M04 §4.6.1–4.6.2; Cohort/outcome connections are CHAMGAP adaptations
- Related sources: R01

### N08 · What are the common conditions and other exposures?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary preserves a healthy population and acute comparison of three drinks.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Pre-visit caffeine/meal/activity restrictions, measurement environment, concurrent exposure and actual condition implementation are unverified.
- Reason for missing information: Pre-visit caffeine/meal/activity restrictions, measurement environment, concurrent exposure and actual condition implementation are unverified.
- Required materials and conditions: Pre-visit caffeine/activity, meals, medication and measurement environment
- Materials to obtain first: Pre-visit conditions, concurrent exposure and actual implementation/measurement records
- Further research: Record actual common product-comparison conditions and other exposures together in follow-up materials.
- Conditions for verification: Connect Pre-visit caffeine/activity, meals, medication and measurement environment to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Pre-visit caffeine/activity, meals, medication and measurement environment.
- Application exceptions: Do not invent fasting/rest/restriction times or experimental/daily-life procedures absent from the stored review summary.
- Remaining uncertainty: Preparation scope of the stored summary. Pre-visit caffeine/meal/activity restrictions, measurement environment, concurrent exposure and actual condition implementation are unverified.
- Referenced methods: M03 §3.2.3, M08 §8.2.2–8.2.3; Chamgap adaptation
- Related sources: R01

### N09 · How were double masking, measurement and interpretation implemented?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The original design is described as double-masked, with investigators preparing drinks in identical containers.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Masking/unmasking of participants, staff, ECG readers and analysts, test techniques, equipment and interpretation details are unverified.
- Reason for missing information: Masking/unmasking of participants, staff, ECG readers and analysts, test techniques, equipment and interpretation details are unverified.
- Required materials and conditions: Roles masked, identical containers and ECG/blood-pressure collection
- Materials to obtain first: Masking, measurement/interpretation methods and original collection materials
- Further research: Connect actual masking by role and measurement processes to outcomes.
- Conditions for verification: Connect Roles masked, identical containers and ECG/blood-pressure collection to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Roles masked, identical containers and ECG/blood-pressure collection.
- Application exceptions: Do not newly verify masking of all interpretations or absence of measurement errors solely from identical containers or a design label.
- Remaining uncertainty: Preparation scope of the stored summary. Masking/unmasking of participants, staff, ECG readers and analysts, test techniques, equipment and interpretation details are unverified.
- Referenced methods: M08 §8.1–8.2.3; internal application; M08 Table 8.2.a, M03 §3.2.4; internal application
- Related sources: R01

### N10 · What are the registration identifier and current registration-content status?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: NCT03196908 appears in the first existing evidence record and research description. The 2017 citation has no separate registration identifier.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Registration dates, changes, original plans and current content/results disclosure are unread; the 2017 registration identity is unverified.
- Reason for missing information: Registration dates, changes, original plans and current content/results disclosure are unread; the 2017 registration identity is unverified.
- Required materials and conditions: 2019 NCT03196908 and registration history/plans
- Materials to obtain first: Original 2019 registration/plans and separate 2017 registration/method materials
- Further research: If registration materials are provided, distinguish the report, plans and actual reading scope.
- Conditions for verification: Connect 2019 NCT03196908 and registration history/plans to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 2019 NCT03196908 and registration history/plans.
- Application exceptions: Do not copy the 2019 NCT as the 2017 registration identifier or upgrade identifier presence to registration verification/link checks.
- Remaining uncertainty: Preparation scope of the stored summary. Registration dates, changes, original plans and current content/results disclosure are unread; the 2017 registration identity is unverified.
- Referenced methods: M04 §4.6.1–4.6.2 distinguishes studies from reports; cohort/result links are a Chamgap application; M08 Table 8.2.a and M04 §4.6.3; Chamgap application
- Related sources: R01, R02

### N11 · What are the bibliographies and source locations of the two reports?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: R01 is Shah SA et al., 2019, J Am Heart Assoc 8:e011318, PMID 31137991. R02 is Fletcher EA et al., 2017, the same journal 6:e004448, PMID 28446495. There is one evidence group and two citations.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. DOIs, PMCIDs, 2017 recruitment/result values and current external bibliography are absent from the stored review summary and were not looked up.
- Reason for missing information: DOIs, PMCIDs, 2017 recruitment/result values and current external bibliography are absent from the stored review summary and were not looked up.
- Required materials and conditions: Shah 2019, Fletcher 2017, PMIDs and evidence/citations
- Materials to obtain first: Original bibliography, full text and registration/population connections for each report
- Further research: When bibliography is supplemented, distinguish report identity, original results and change events.
- Conditions for verification: Connect Shah 2019, Fletcher 2017, PMIDs and evidence/citations to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Shah 2019, Fletcher 2017, PMIDs and evidence/citations.
- Application exceptions: Do not create an evidence group absent from the stored summary for R02 or infer DOI/PMCID from article numbers.
- Remaining uncertainty: Preparation scope of the stored summary. DOIs, PMCIDs, 2017 recruitment/result values and current external bibliography are absent from the stored review summary and were not looked up.
- Referenced methods: M04 §§4.6.1–4.6.2 distinction between studies and reports; cohort/outcome links are Chamgap adaptations
- Related sources: R01, R02

### N12 · What is the scope of investigator overlap and Mayo blood-pressure replication?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary states that 2017 involved overlapping investigators and was not independent replication; independent Mayo investigators replicated blood pressure only. Limited independent QTc replication is a historical description.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Actual participant overlap/trial relationships between 2017 and 2019 and Mayo bibliography/populations/values are unverified.
- Reason for missing information: Actual participant overlap/trial relationships between 2017 and 2019 and Mayo bibliography/populations/values are unverified.
- Required materials and conditions: Identical/unknown cohorts, author overlap and independent QTc/BP distinction
- Materials to obtain first: Authors/institutions, registration, participant families and actual Mayo reports
- Further research: Distinguish identical cohorts, investigator overlap, independent institutions and QTc/blood-pressure endpoint replication in new materials.
- Conditions for verification: Connect Identical/unknown cohorts, author overlap and independent QTc/BP distinction to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Identical/unknown cohorts, author overlap and independent QTc/BP distinction.
- Application exceptions: Do not equate investigator overlap with an identical cohort or create R03/independent clinical-arrhythmia evidence from unspecified Mayo mentions.
- Remaining uncertainty: Preparation scope of the stored summary. Actual participant overlap/trial relationships between 2017 and 2019 and Mayo bibliography/populations/values are unverified.
- Referenced methods: Study/report distinction in M04 §4.6.1–4.6.2; Cohort/outcome linkage is Chamgap application; M04 §4.6.1–4.6.2 and M15 §15.3.1; Chamgap application
- Related sources: R01, R02

### N13 · What is the original scope of support and disclosed relationships?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The original record states University of the Pacific support, no reported energy-drink-company funding and Sachin A. Shah’s expert-witness history in caffeine energy-drink litigation.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Product purchase/provision, analysis/publication support, current contracts/relationships and individual 2017 funding/COI disclosures are unread.
- Reason for missing information: Product purchase/provision, analysis/publication support, current contracts/relationships and individual 2017 funding/COI disclosures are unread.
- Required materials and conditions: 2019 university support, unreported company funding and litigation expert-witness history
- Materials to obtain first: Original support, product provision, author disclosures and analysis/publication roles for each report
- Further research: If disclosures are provided, distinguish reports, support types, external relationships and historical/current scope.
- Conditions for verification: Connect 2019 university support, unreported company funding and litigation expert-witness history to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 2019 university support, unreported company funding and litigation expert-witness history.
- Application exceptions: Do not upgrade university support or unreported company funding to new independence certification, absence of conflicts or identical 2017 support.
- Remaining uncertainty: Preparation scope of the stored summary. Product purchase/provision, analysis/publication support, current contracts/relationships and individual 2017 funding/COI disclosures are unread.
- Referenced methods: Chamgap's own conditions for independence and attribution. The official methodological sections used in this example do not validate every detail of these items.
- Related sources: R01, R02

### N14 · How are original dates, Korean/English text, corrections, axes and history retained?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The reference date is 2026-08-26, corrections are an empty array and deliberation an empty string. Complete stored review text preserves Korean/English content, synthesized summaries, verdict decisions, assessment axes and false flags.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Separate classification information and the primary-failed/secondary-positive indicator are absent from this stored review summary. Empty corrections are not a current external correction/retraction check.
- Reason for missing information: Separate classification information and the primary-failed/secondary-positive indicator are absent from this stored review summary. Empty corrections are not a current external correction/retraction check.
- Required materials and conditions: 2026-08-26, empty corrections/deliberation and parent/sibling context
- Materials to obtain first: Complete original stored review summary and actual correction/change events
- Further research: If changed materials arise, distinguish the complete pre-change original, events, versions and separate application.
- Conditions for verification: Connect 2026-08-26, empty corrections/deliberation and parent/sibling context to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 2026-08-26, empty corrections/deliberation and parent/sibling context.
- Application exceptions: Do not fill original grades, absences, empty values or historical cross-checks with new values/current completed review.
- Remaining uncertainty: Preparation scope of the stored summary. Separate classification information and the primary-failed/secondary-positive indicator are absent from this stored review summary. Empty corrections are not a current external correction/retraction check.
- Referenced methods: M04 §§4.5 and 4.6.3; limits of the current material conversion follow the review scope and Chamgap design
- Related sources: R01, R02

### N15 · Which materials were actually read?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The complete preserved 2961 JSON and its two existing selections were read for preparation. Reading of each report’s summary is distinguished from unread external originals in each checklist.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. External abstracts, full texts, registrations, plans, results/harms and disclosures have not been accessed or acquired; no link checks were performed.
- Reason for missing information: External abstracts, full texts, registrations, plans, results/harms and disclosures have not been accessed or acquired; no link checks were performed.
- Required materials and conditions: Complete local JSON summary, report-specific material items and unread external originals
- Materials to obtain first: User-provided original materials and actual acquisition/reading records
- Further research: Distinguish public availability, access, acquisition, actual reading scope and dates for new materials.
- Conditions for verification: Connect Complete local JSON summary, report-specific material items and unread external originals to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Complete local JSON summary, report-specific material items and unread external originals.
- Application exceptions: Do not convert original citation links, historical paper descriptions or copies into external full-text reading/successful access.
- Remaining uncertainty: Preparation scope of the stored summary. External abstracts, full texts, registrations, plans, results/harms and disclosures have not been accessed or acquired; no link checks were performed.
- Referenced methods: M04 §4.5–4.6 material collection/selection principles; acquisition/reading separation and hyperlink specifications are internally designed; M04 §4.5, §4.6.3; limits of this material conversion follow the review scope and internal design
- Related sources: R01, R02

### N16 · Are two checklists/material items distinguished from trials/participants?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The two existing questions have different scopes in the same complete stored summary. Connecting R01’s 34 people, A/B/placebo and time-point materials to both checklists creates no new participant or replication trial.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Unique trial count, participant total, actual inter-report cohort overlap and independence are not newly summed or certified.
- Reason for missing information: Unique trial count, participant total, actual inter-report cohort overlap and independence are not newly summed or certified.
- Required materials and conditions: s0/s1, two reports, conditions/time points and null unique trial/participant totals
- Materials to obtain first: Trial-report-participant-condition-time-point-question relationships
- Further research: Connect additional reports by distinguishing identical/different populations, institutions and endpoints.
- Conditions for verification: Connect s0/s1, two reports, conditions/time points and null unique trial/participant totals to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of s0/s1, two reports, conditions/time points and null unique trial/participant totals.
- Application exceptions: Do not add two checklists/reports/crossover conditions or 34-person values to create an independent total sample.
- Remaining uncertainty: Preparation scope of the stored summary. Unique trial count, participant total, actual inter-report cohort overlap and independence are not newly summed or certified.
- Referenced methods: M04 §4.6.1–4.6.2 distinguishes studies from reports; cohort/result links are a Chamgap application; M08 Table 8.2.a, M15 §15.3 and M19 §19.1.2–19.2.4; design-specific adaptation is Chamgap’s own design
- Related sources: R01, R02

### N17 · What is connected when new materials become available?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The two existing questions are prepared separately in the same seven-column format. Each condition was saved/frozen first, with a separate application timestamp retained.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. No new clinical search, calculation, effect/CI, reassessment, independence certification or model/internal content review was performed.
- Reason for missing information: No new clinical search, calculation, effect/CI, reassessment, independence certification or model/internal content review was performed.
- Required materials and conditions: Conditions, originals, observations, corrections, reading and change events
- Materials to obtain first: User-provided direct endpoint/denominator/plan, clinical event, correction and harm materials
- Further research: Separate actual additions/changes into complete prior originals, events, condition versions/freezing, separate application and current handoff.
- Conditions for verification: Connect Conditions, originals, observations, corrections, reading and change events to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Conditions, originals, observations, corrections, reading and change events.
- Application exceptions: Original candidate pending/eligibility indications are historical; do not reactivate them as active review/waiting.
- Remaining uncertainty: Preparation scope of the stored summary. No new clinical search, calculation, effect/CI, reassessment, independence certification or model/internal content review was performed.
- Referenced methods: M04 §§4.5 and 4.6.3; limits of the current material conversion follow the review scope and Chamgap design
- Related sources: R01, R02

### N18 · What is the direct definition of clinical arrhythmia?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The selected question is “Increased clinical arrhythmia”; the stored review note explicitly states that the four-hour trial did not test clinical arrhythmia.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Arrhythmia types, symptom/ECG verification, assessment criteria, baseline arrhythmia exclusions and occurrence definitions are unverified.
- Reason for missing information: Arrhythmia types, symptom/ECG verification, assessment criteria, baseline arrhythmia exclusions and occurrence definitions are unverified.
- Required materials and conditions: Actual clinical-arrhythmia types, diagnosis/verification and symptoms/assessment
- Materials to obtain first: Direct clinical-event definitions, verification/adjudication and diagnostic materials
- Further research: Retain a proposal to specify event types, verification levels, occurrence times and original populations in clinical-event materials.
- Conditions for verification: Connect Actual clinical-arrhythmia types, diagnosis/verification and symptoms/assessment to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Actual clinical-arrhythmia types, diagnosis/verification and symptoms/assessment.
- Application exceptions: Do not convert QTc prolongation, blood-pressure signals or assumed palpitations into actual arrhythmia diagnoses.
- Remaining uncertainty: Preparation scope of the stored summary. Arrhythmia types, symptom/ECG verification, assessment criteria, baseline arrhythmia exclusions and occurrence definitions are unverified.
- Referenced methods: M03 §3.2.4, M15 §15.3.1–15.3.3; Question-specific outcome adaptations are designed by CHAMGAP; M19 §19.1.2–19.2.4; Detailed distinctions are designed by CHAMGAP
- Related sources: R01

### N19 · Does the QTc biomarker answer increased event occurrence?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: QTc is an ECG marker of delayed ventricular repolarization. The parent states that QTc prolongation cannot immediately be called clinical-arrhythmia occurrence.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Connections/validation between biomarker changes and direct arrhythmia occurrence, and occurrence data by population/duration, are unverified.
- Reason for missing information: Connections/validation between biomarker changes and direct arrhythmia occurrence, and occurrence data by population/duration, are unverified.
- Required materials and conditions: Separation of delayed-repolarization biomarkers and direct clinical events
- Materials to obtain first: Direct event follow-up, diagnoses and outcomes separate from exposures/biomarkers
- Further research: Retain a proposal to distinguish biomarkers, symptoms and verified events in actual clinical materials.
- Conditions for verification: Connect Separation of delayed-repolarization biomarkers and direct clinical events to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Separation of delayed-repolarization biomarkers and direct clinical events.
- Application exceptions: Do not convert biomarker P values/means/the 10-ms assumption into clinical-arrhythmia effects or event counts.
- Remaining uncertainty: Preparation scope of the stored summary. Connections/validation between biomarker changes and direct arrhythmia occurrence, and occurrence data by population/duration, are unverified.
- Referenced methods: M03 §3.2.4; internally defined extension boundary; M03 §3.2.4, M15 §15.3.1–15.3.3; question-specific outcome adaptation is internally designed
- Related sources: R01

### N20 · Are arrhythmia event counts and at-risk population denominators available?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary records that arrhythmia, hospitalization and death were not tested. The 34 people are participants in the biomarker crossover trial.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Clinical-arrhythmia numerators, actual at-risk/condition-specific denominators, recurrent/first occurrences and person-time are unverified.
- Reason for missing information: Clinical-arrhythmia numerators, actual at-risk/condition-specific denominators, recurrent/first occurrences and person-time are unverified.
- Required materials and conditions: Clinical-event numerators, exposure/comparator denominators, baseline disease and recurrent events
- Materials to obtain first: Direct event counts, at-risk/exposure denominators and person/event relationships
- Further research: Retain a proposal to distinguish person counts, recurrent events, exposure conditions and risk periods in clinical materials.
- Conditions for verification: Connect Clinical-event numerators, exposure/comparator denominators, baseline disease and recurrent events to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Clinical-event numerators, exposure/comparator denominators, baseline disease and recurrent events.
- Application exceptions: Do not convert untested outcomes into zero events or copy 34 as a verified arrhythmia denominator.
- Remaining uncertainty: Preparation scope of the stored summary. Clinical-arrhythmia numerators, actual at-risk/condition-specific denominators, recurrent/first occurrences and person-time are unverified.
- Referenced methods: M08 Table 8.2.a, M15 §15.3, M19 §19.1.2–19.2.4; Design-specific adaptations are designed by CHAMGAP; M19 §19.1.2–19.2.4; CHAMGAP adaptation
- Related sources: R01

### N21 · How do four-hour measurements differ from clinical-risk periods?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: 2019 measurements occurred every 30 minutes through 240 minutes after intake. The study is not recorded as sufficiently capturing subsequent clinical events.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Continuous event monitoring, emergency/hospitalization follow-up, post-exposure risk windows and long-term follow-up are unverified.
- Reason for missing information: Continuous event monitoring, emergency/hospitalization follow-up, post-exposure risk windows and long-term follow-up are unverified.
- Required materials and conditions: 240 minutes of acute biomarker measurements, actual event follow-up and long-term exposure
- Materials to obtain first: Clinical verification, timing/risk windows and long-term follow-up materials
- Further research: Retain a proposal to distinguish measurement times from actual event observation/verification periods.
- Conditions for verification: Connect 240 minutes of acute biomarker measurements, actual event follow-up and long-term exposure to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 240 minutes of acute biomarker measurements, actual event follow-up and long-term exposure.
- Application exceptions: Do not convert four-hour test markers into completed clinical-event testing or absence of long-term events.
- Remaining uncertainty: Preparation scope of the stored summary. Continuous event monitoring, emergency/hospitalization follow-up, post-exposure risk windows and long-term follow-up are unverified.
- Referenced methods: Design-specific harm questions in M19 §19.2; Detailed temporal relationships are internally designed; M03 §3.2.4, M15 §15.3.1–15.3.3; Question-specific outcome adaptations are designed by CHAMGAP
- Related sources: R01

### N22 · What are the actual contrasts and adjustments for clinical events?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: Original A/B/placebo comparisons concern QTc and blood pressure. Actual estimates comparing increased clinical arrhythmia are not provided in the stored review summary.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Clinical-event contrasts, baseline risk, caffeine/concurrent-exposure adjustment and crossover/observational-design models are unverified.
- Reason for missing information: Clinical-event contrasts, baseline risk, caffeine/concurrent-exposure adjustment and crossover/observational-design models are unverified.
- Required materials and conditions: Verified energy-drink-versus-comparator arrhythmia effects and models
- Materials to obtain first: Direct clinical comparisons, numerators/denominators and confounding/analysis definitions
- Further research: Retain a proposal to connect actual exposure, comparator populations, baseline risk and models with events in clinical materials.
- Conditions for verification: Connect Verified energy-drink-versus-comparator arrhythmia effects and models to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Verified energy-drink-versus-comparator arrhythmia effects and models.
- Application exceptions: Do not transfer biomarker A/B pairwise P values or caffeine content to between-condition clinical-event effects.
- Remaining uncertainty: Preparation scope of the stored summary. Clinical-event contrasts, baseline risk, caffeine/concurrent-exposure adjustment and crossover/observational-design models are unverified.
- Referenced methods: M19 §19.2.2–19.2.4, M03 §3.2.3; CHAMGAP adaptation; M08 §8.2.2, M15 §15.3.1; CHAMGAP adaptation
- Related sources: R01

### N23 · Are arrhythmia effects, CIs and power provided?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: Unreported 95% CIs and the 10-ms assumption in the stored review summary concern between-condition QTc comparisons. Clinical-arrhythmia effects/CIs were not provided.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Direct arrhythmia risk differences/RRs/HRs, CIs, power and minimum important differences are unverified.
- Reason for missing information: Direct arrhythmia risk differences/RRs/HRs, CIs, power and minimum important differences are unverified.
- Required materials and conditions: Direct clinical-event effects, intervals, denominators and power
- Materials to obtain first: Clinical occurrence effects, intervals, actual denominators and plans
- Further research: If direct clinical estimates are provided, connect measures, denominators, durations and uncertainty.
- Conditions for verification: Connect Direct clinical-event effects, intervals, denominators and power to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Direct clinical-event effects, intervals, denominators and power.
- Application exceptions: Do not calculate arrhythmia effects/CIs/risk rates from the QTc 10-ms assumption, ±, P values or n.
- Remaining uncertainty: Preparation scope of the stored summary. Direct arrhythmia risk differences/RRs/HRs, CIs, power and minimum important differences are unverified.
- Referenced methods: M15 §15.3.1–15.3.3; Chamgap adaptation; M08 Table 8.2.a, M15 §15.3, M19 §19.1.2–19.2.4; design-specific adaptations are Chamgap design
- Related sources: R01

### N24 · What are the prespecified and actual clinical-arrhythmia collection plans?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The original prespecified primary endpoint was QTc; the stored review summary explicitly states that clinical arrhythmia was not tested.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Prespecified arrhythmia endpoints, active/passive collection, surveillance plans, plan dates and actual implementation are unverified.
- Reason for missing information: Prespecified arrhythmia endpoints, active/passive collection, surveillance plans, plan dates and actual implementation are unverified.
- Required materials and conditions: Event plans, diagnosis, surveillance and primary/supportive/exploratory hierarchy
- Materials to obtain first: Original plans, clinical-event collection/assessment and outcome hierarchy
- Further research: Retain a proposal to distinguish prespecified plans from actual collection and the scope of events tested in new materials.
- Conditions for verification: Connect Event plans, diagnosis, surveillance and primary/supportive/exploratory hierarchy to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Event plans, diagnosis, surveillance and primary/supportive/exploratory hierarchy.
- Application exceptions: Do not inherit primary QTc or an NCT identifier as prespecified/actually tested clinical arrhythmia.
- Remaining uncertainty: Preparation scope of the stored summary. Prespecified arrhythmia endpoints, active/passive collection, surveillance plans, plan dates and actual implementation are unverified.
- Referenced methods: M08 Table 8.2.a, M04 §4.6.3; Chamgap's own application
- Related sources: R01

### N25 · How do event missingness, non-collection and non-reporting differ?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: Only the preserved description of untested arrhythmia in a biomarker trial was read this time. External original materials/supplementary tables are unread.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Distinctions among absent event collection, non-reporting, undetermined findings, observation loss and zero events, and direct materials, are unverified.
- Reason for missing information: Distinctions among absent event collection, non-reporting, undetermined findings, observation loss and zero events, and direct materials, are unverified.
- Required materials and conditions: Actual clinical-event collection, observation loss and reporting level
- Materials to obtain first: Clinical collection methods, follow-up flow, omissions/missingness and original tables
- Further research: Retain a proposal to distinguish actual non-occurrence of events from absent collection/follow-up in clinical materials.
- Conditions for verification: Connect Actual clinical-event collection, observation loss and reporting level to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Actual clinical-event collection, observation loss and reporting level.
- Application exceptions: Do not convert currently unread/untested materials into failed access, zero arrhythmias or confirmed increased arrhythmia.
- Remaining uncertainty: Preparation scope of the stored summary. Distinctions among absent event collection, non-reporting, undetermined findings, observation loss and zero events, and direct materials, are unverified.
- Referenced methods: M08 §8.2.2 and M15 §15.3.1: in-house application; M08 Table 8.2.a, M15 §15.3 and M19 §19.1.2–19.2.4: design-specific adaptation is in-house.
- Related sources: R01

### N26 · Are hospitalization, death and symptoms separate outcomes?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary states that arrhythmia, hospitalization and death were not directly tested. Symptom-occurrence values were not provided either.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Definitions, denominators and durations for symptoms, verified arrhythmia, emergency care/hospitalization and death are unverified.
- Reason for missing information: Definitions, denominators and durations for symptoms, verified arrhythmia, emergency care/hospitalization and death are unverified.
- Required materials and conditions: Distinction among arrhythmia, palpitations/symptoms, hospitalization and death
- Materials to obtain first: Direct verification, numerators/denominators and risk periods for each clinical outcome
- Further research: Retain a proposal to record symptoms, diagnoses, healthcare use and death as separate event outcomes.
- Conditions for verification: Connect Distinction among arrhythmia, palpitations/symptoms, hospitalization and death to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Distinction among arrhythmia, palpitations/symptoms, hospitalization and death.
- Application exceptions: Do not assume symptoms to create new events or sum event types into a composite occurrence rate.
- Remaining uncertainty: Preparation scope of the stored summary. Definitions, denominators and durations for symptoms, verified arrhythmia, emergency care/hospitalization and death are unverified.
- Referenced methods: M03 §3.2.4, M15 §15.3.1–15.3.3; Question-specific outcome adaptations are designed by CHAMGAP; CHAMGAP’s interpretation boundary, informed by M19 principles; no official causality tool was run
- Related sources: R01

### N27 · What are applicability gaps for patients, adolescents and long-term exposure?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The original 2019 population comprised healthy adults aged 18–40, excluding disease, hypertension, QT prolongation and regular medication use.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Direct arrhythmia materials for baseline arrhythmia/cardiovascular risk, adolescents, medication/mixed exposure, small doses and repeated/chronic intake are unverified.
- Reason for missing information: Direct arrhythmia materials for baseline arrhythmia/cardiovascular risk, adolescents, medication/mixed exposure, small doses and repeated/chronic intake are unverified.
- Required materials and conditions: Healthy young people, one high-volume exposure and other risks/durations
- Materials to obtain first: Direct clinical occurrence materials by exposure/risk population/duration
- Further research: Retain a proposal to distinguish actual risk populations, exposures, durations, concurrent medication and events in clinical materials.
- Conditions for verification: Connect Healthy young people, one high-volume exposure and other risks/durations to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Healthy young people, one high-volume exposure and other risks/durations.
- Application exceptions: Do not newly establish/create clinical harms/safety, prevention/treatment or intake-care guidance for populations outside the trial.
- Remaining uncertainty: Preparation scope of the stored summary. Direct arrhythmia materials for baseline arrhythmia/cardiovascular risk, adolescents, medication/mixed exposure, small doses and repeated/chronic intake are unverified.
- Referenced methods: M03 §3.2.1–3.2.4; dose, duration and effect-modification details are Chamgap’s own design; M03 §3.2.1; detailed population conditions are Chamgap’s own design
- Related sources: R01

### N28 · Are earlier QTc and independent blood-pressure descriptions direct arrhythmia replication?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: 2017 is an earlier bibliography with QTc prolongation direction; Mayo is a description of independent blood-pressure replication. The stored review summary has no independent replication results for direct arrhythmia occurrence.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Actual clinical-event collection, bibliography, samples and verification materials from earlier/separate trials, and independent direct arrhythmia research, are unverified.
- Reason for missing information: Actual clinical-event collection, bibliography, samples and verification materials from earlier/separate trials, and independent direct arrhythmia research, are unverified.
- Required materials and conditions: Separation of 2017 biomarkers, Mayo blood pressure and direct clinical-event materials
- Materials to obtain first: Clinical outcomes and population/institution/registration connections in each actual report
- Further research: Retain a proposal to distinguish biomarker replication, institutional independence and direct clinical-event replication in additional materials.
- Conditions for verification: Connect Separation of 2017 biomarkers, Mayo blood pressure and direct clinical-event materials to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Separation of 2017 biomarkers, Mayo blood pressure and direct clinical-event materials.
- Application exceptions: Do not transfer earlier overlapping-investigator or independent blood-pressure descriptions into independently established increased clinical arrhythmia.
- Remaining uncertainty: Preparation scope of the stored summary. Actual clinical-event collection, bibliography, samples and verification materials from earlier/separate trials, and independent direct arrhythmia research, are unverified.
- Referenced methods: M04 §4.6.1–4.6.2, M15 §15.3.1; CHAMGAP adaptation; Distinction between studies and reports in M04 §4.6.1–4.6.2; Cohort/outcome connections are CHAMGAP adaptations
- Related sources: R01, R02

### N29 · What is the scope of the original ? grade and untested-outcome note?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The selected grade is ?, with the note “The four-hour trial did not test clinical arrhythmia.” Parent D30 biomarker-harm context is retained in its original role.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Direct clinical occurrence, risks/CIs, testing and long-term materials are unverified. This preparation does not assess effects or grades.
- Reason for missing information: Direct clinical occurrence, risks/CIs, testing and long-term materials are unverified. This preparation does not assess effects or grades.
- Required materials and conditions: Selected clinical-event question, original ? and gap in direct evidence
- Materials to obtain first: Direct clinical-event comparison/verification materials and user-provided originals
- Further research: If new direct materials are provided, preserve original ? and originals/change events while distinguishing separate judgment and preparation.
- Conditions for verification: Connect Selected clinical-event question, original ? and gap in direct evidence to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Selected clinical-event question, original ? and gap in direct evidence.
- Application exceptions: Do not copy parent D in place of the selected ? or display the question “Increased clinical arrhythmia” as a confirmed observed conclusion.
- Remaining uncertainty: Preparation scope of the stored summary. Direct clinical occurrence, risks/CIs, testing and long-term materials are unverified. This preparation does not assess effects or grades.
- Referenced methods: Question-clarification principles in M03 §3.1, §3.2.1–3.2.4; detailed separation rules are internally designed; M04 §4.6.3, M15 §15.3.1–15.3.3; status separation is internally designed
- Related sources: R01

### H01 · Are biomarkers, harms and clinical-event collection distinguished?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: Original materials record QTc/BP time changes and no testing of arrhythmia/hospitalization/death. Direct materials for the selected clinical events are unverified.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Complete adverse/serious event lists, collection/relatedness assessment and verified clinical-event lists are unverified.
- Reason for missing information: Complete adverse/serious event lists, collection/relatedness assessment and verified clinical-event lists are unverified.
- Required materials and conditions: QTc/BP testing, verified clinical events and adverse-event definitions
- Materials to obtain first: Collection plans, harm definitions and direct clinical outcome tables
- Further research: Retain a proposal to distinguish measured biomarkers, symptoms and verified events in follow-up materials.
- Conditions for verification: Connect QTc/BP testing, verified clinical events and adverse-event definitions to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of QTc/BP testing, verified clinical events and adverse-event definitions.
- Application exceptions: Do not convert biomarker worsening into clinical-event counts or untested outcomes into zero adverse events.
- Remaining uncertainty: Preparation scope of the stored summary. Complete adverse/serious event lists, collection/relatedness assessment and verified clinical-event lists are unverified.
- Referenced methods: M19 §19.1.2–19.2.4; Detailed distinctions are designed by CHAMGAP
- Related sources: R01

### H02 · What are harm timing and actual exposure?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: Research exposure was 946 mL with about 300–320 mg caffeine within one hour; measurements covered 240 minutes.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Actual completed exposure, individual response times, post-follow-up events and long-term risk periods are unverified.
- Reason for missing information: Actual completed exposure, individual response times, post-follow-up events and long-term risk periods are unverified.
- Required materials and conditions: Single research exposure, acute measurement and event-risk periods
- Materials to obtain first: Actual exposure, response times and event follow-up/risk windows
- Further research: Retain a proposal to distinguish exposure, testing times and clinical-event risk periods in harm materials.
- Conditions for verification: Connect Single research exposure, acute measurement and event-risk periods to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Single research exposure, acute measurement and event-risk periods.
- Application exceptions: Do not convert the original exposure into recommended intake, a safe dose or prevention/treatment methods.
- Remaining uncertainty: Preparation scope of the stored summary. Actual completed exposure, individual response times, post-follow-up events and long-term risk periods are unverified.
- Referenced methods: M19 §19.2 design-specific harm questions; timing details are Chamgap-designed
- Related sources: R01

### H03 · How do between-condition biomarker differences differ from clinical harm comparisons?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: The stored review summary records maximum QTc and blood-pressure time differences, while direct clinical arrhythmia/hospitalization/death comparisons were not tested.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Clinical-event contrasts, original numerators/denominators, durations and intervals are unverified.
- Reason for missing information: Clinical-event contrasts, original numerators/denominators, durations and intervals are unverified.
- Required materials and conditions: Biomarker outcomes for A/B/placebo and clinical-event comparisons
- Materials to obtain first: Actual clinical-event comparators, counts and estimates
- Further research: Retain a proposal to connect direct harm materials using event definitions, comparisons and intervals separate from biomarkers.
- Conditions for verification: Connect Biomarker outcomes for A/B/placebo and clinical-event comparisons to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Biomarker outcomes for A/B/placebo and clinical-event comparisons.
- Application exceptions: Do not transfer biomarker P values to clinical-harm P values or between-condition event risks.
- Remaining uncertainty: Preparation scope of the stored summary. Clinical-event contrasts, original numerators/denominators, durations and intervals are unverified.
- Referenced methods: M19 §§19.2.2–19.2.4 and M03 §3.2.3; Chamgap adaptation
- Related sources: R01

### H04 · What are safety and event denominators?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The 34 people in the stored review summary are healthy adult crossover-trial participants; separate denominators for each event/safety analysis were not provided.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Condition-specific exposure, measurement, event collection, serious-harm denominators and repeated-observation aggregation are unverified.
- Reason for missing information: Condition-specific exposure, measurement, event collection, serious-harm denominators and repeated-observation aggregation are unverified.
- Required materials and conditions: 34 people and actual denominators by condition/time/event
- Materials to obtain first: Safety/event denominators, condition-specific flow and original counts
- Further research: Retain a proposal to distinguish person, condition, time-point and measurement/event denominators in originals.
- Conditions for verification: Connect 34 people and actual denominators by condition/time/event to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 34 people and actual denominators by condition/time/event.
- Application exceptions: Do not multiply crossover conditions/time measurements into participant counts or calculate risk rates from unread materials.
- Remaining uncertainty: Preparation scope of the stored summary. Condition-specific exposure, measurement, event collection, serious-harm denominators and repeated-observation aggregation are unverified.
- Referenced methods: M19 §§19.1.2–19.2.4; Chamgap adaptation; M08 Table 8.2.a, M15 §15.3 and M19 §§19.1.2–19.2.4; design-specific adaptation is Chamgap-designed
- Related sources: R01

### H05 · What are alternative harm factors and ingredient-specific attribution?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: Exposure was commercial energy drink with about 300–320 mg caffeine. The stored review summary preserves a whole-product comparison.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Non-caffeine ingredients, composition, other exposures, baseline susceptibility and alternative causes/relatedness assessment for individual events are unverified.
- Reason for missing information: Non-caffeine ingredients, composition, other exposures, baseline susceptibility and alternative causes/relatedness assessment for individual events are unverified.
- Required materials and conditions: Caffeine, combined ingredients, baseline/concurrent exposures and relatedness
- Materials to obtain first: Original ingredients, concurrent exposures, baseline risk and harm-case assessment
- Further research: Retain a proposal to distinguish whole products, ingredient-specific attribution and alternative factors in direct harm materials.
- Conditions for verification: Connect Caffeine, combined ingredients, baseline/concurrent exposures and relatedness to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Caffeine, combined ingredients, baseline/concurrent exposures and relatedness.
- Application exceptions: Do not attribute every signal to caffeine alone or established harm from a particular ingredient, or invent mechanisms/event cases.
- Remaining uncertainty: Preparation scope of the stored summary. Non-caffeine ingredients, composition, other exposures, baseline susceptibility and alternative causes/relatedness assessment for individual events are unverified.
- Referenced methods: M19 §§19.2.2–19.2.4 design considerations; detailed confounding records are Chamgap-designed
- Related sources: R01

### H06 · Are unread, untested, unreported and zero events distinguished?

Verification status: Unverified  
Reading scope: Summary read; external materials not read

- Current findings: Actual reading this time concerns preserved JSON summaries; the original description of untested clinical events is retained.
- Why unverified: Required direct definitions, values and materials are unverified within the current stored-summary/unread-external-material scope. Distinctions among collection, non-reporting, undetermined findings and actual zero events in external originals, and all harm outcomes, are unverified.
- Reason for missing information: Distinctions among collection, non-reporting, undetermined findings and actual zero events in external originals, and all harm outcomes, are unverified.
- Required materials and conditions: Actual reading level, untested clinical endpoints and original reports
- Materials to obtain first: Original collection plans, complete results, missingness reasons and reading records
- Further research: Only for provided materials, connect actual zero events, missingness, non-reporting and non-collection with locations/durations.
- Conditions for verification: Connect Actual reading level, untested clinical endpoints and original reports to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Actual reading level, untested clinical endpoints and original reports.
- Application exceptions: Do not convert currently unread materials into zero side effects, failed access, an absent paper or confirmed direct clinical harm.
- Remaining uncertainty: Preparation scope of the stored summary. Distinctions among collection, non-reporting, undetermined findings and actual zero events in external originals, and all harm outcomes, are unverified.
- Referenced methods: M19 §§19.1.2–19.2.4 and M04 §4.6.3; Chamgap adaptation
- Related sources: R01, R02

### H07 · Are harms across reports, conditions and two checklists protected from duplicate counting?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: Two checklists prepare different existing questions from the same stored 2961 summary. The 2017/2019 bibliographies involve overlapping investigators; actual participant overlap is unverified.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Actual relationships of identical events/people across reports, independent harm families and repeated events by condition are unverified.
- Reason for missing information: Actual relationships of identical events/people across reports, independent harm families and repeated events by condition are unverified.
- Required materials and conditions: 2017/2019, author overlap, conditions/time points and two questions in the same summary
- Materials to obtain first: Report-person-condition-time-point-event-question relationships
- Further research: Retain a proposal to distinguish repeated reports of the same event from different populations/new events in harm materials.
- Conditions for verification: Connect 2017/2019, author overlap, conditions/time points and two questions in the same summary to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of 2017/2019, author overlap, conditions/time points and two questions in the same summary.
- Application exceptions: Do not equate investigator overlap with the same cohort or count two bibliographies/checklists as new independent-event replication.
- Remaining uncertainty: Preparation scope of the stored summary. Actual relationships of identical events/people across reports, independent harm families and repeated events by condition are unverified.
- Referenced methods: M04 §§4.6.1–4.6.2; harm-material adaptation is Chamgap-designed; M04 §§4.6.1–4.6.2 distinction between studies and reports; cohort/outcome links are Chamgap adaptations
- Related sources: R01, R02

### H08 · What are safety gaps for long-term use and vulnerable populations?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: The parent emphasizes a single high-volume exposure in healthy young adults; the original safety status is Caution.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. Direct harm/clinical-event materials for chronic/repeated intake, other doses, adolescents, disease/medication and mixed exposures are unverified within this scope.
- Reason for missing information: Direct harm/clinical-event materials for chronic/repeated intake, other doses, adolescents, disease/medication and mixed exposures are unverified within this scope.
- Required materials and conditions: Selected healthy adults, single high-volume exposure and chronic use/patients/adolescents
- Materials to obtain first: Direct harms and clinical follow-up by exposure/duration/risk population
- Further research: Retain a proposal to record direct materials together with actual exposure, population and observation duration.
- Conditions for verification: Connect Selected healthy adults, single high-volume exposure and chronic use/patients/adolescents to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Selected healthy adults, single high-volume exposure and chronic use/patients/adolescents.
- Application exceptions: Do not create safe-dose, intake/care, arrhythmia prevention/treatment or medical-replacement procedures.
- Remaining uncertainty: Preparation scope of the stored summary. Direct harm/clinical-event materials for chronic/repeated intake, other doses, adolescents, disease/medication and mixed exposures are unverified within this scope.
- Referenced methods: M19 §§19.1.2–19.2.4; Chamgap adaptation
- Related sources: R01

### H09 · Are signals distinguished from direct causal or clinical confirmation?

Verification status: Partly verified  
Reading scope: Summary read; external materials not read

- Current findings: Original s0 is D for the no-QTc/BP-effect claim; s1 is ? for increased clinical arrhythmia. Biomarker signals and the gap in direct clinical events are retained separately.
- Why unverified: Information from the stored summary is connected; this does not mean new clinical verification, fulfilled conditions or completed content review. No new benefit/harm assessment, occurrence effect, causal/independence certification or treatment selection was created.
- Reason for missing information: No new benefit/harm assessment, occurrence effect, causal/independence certification or treatment selection was created.
- Required materials and conditions: Biomarker signals, original D, direct clinical ? and unverified information
- Materials to obtain first: Actual biomarker/clinical-event materials, denominators, intervals and verification
- Further research: Retain a proposal to distinguish observation, relatedness, direct clinical-effect levels and change events in additional materials.
- Conditions for verification: Connect Biomarker signals, original D, direct clinical ? and unverified information to actual endpoints, exposures, comparisons, time, denominators and reading levels; distinguish unverified information.
- Why this condition is needed: Preparation condition retaining the original scope of Biomarker signals, original D, direct clinical ? and unverified information.
- Application exceptions: Do not label original question wording as proven observation or combine biomarkers and clinical events into a new harm assessment.
- Remaining uncertainty: Preparation scope of the stored summary. No new benefit/harm assessment, occurrence effect, causal/independence certification or treatment selection was created.
- Referenced methods: Chamgap interpretive boundary informed by M19 principles; no formal causality tool was run
- Related sources: R01

## Evidence and sources

### R01

Shah SA, et al. Impact of High Volume Energy Drink Consumption on Electrocardiographic and Blood Pressure Parameters: A Randomized Trial. J Am Heart Assoc. 2019;8:e011318. PMID: 31137991.

[PubMed](https://pubmed.ncbi.nlm.nih.gov/31137991/)

Materials actually read: Summary read; external materials not read  
Findings recorded in the summary: Maximum Bazett-QTc changes: A +17.9±13.9 ms, B +19.6±15.8 ms, placebo +11.9±11.1 ms; overall P=.005; blood-pressure time interactions are separate. The original boundary states that direct clinical arrhythmia, hospitalization and death were not tested.  
Record level: First existing evidence record / Parent QTc and blood-pressure biomarker outcomes  
Independent replication: Shah 2019 pivotal direct biomarker trial and Fletcher 2017 earlier report with overlapping investigators. Actual participant/registration relationships are unverified; an identical cohort is not established. Mayo blood-pressure replication is qualitative stored-summary context without a bibliography; no R03 is created. Two checklists/conditions/time points are not summed.

| Material | Public availability | Access status | Actually read | Notes |
|---|---|---|---|---|
| Stored summary | Locally preserved summary | Local copy acquired | Summary read | The relevant bibliography, results and scope in the complete stored summary were read for preparation; this is not external full-text reading. |
| External abstract | Current publication and access unverified | Access not attempted; not acquired | Not read | Only the citation URL in the review summary is connected; no current abstract/access verification was made. |
| External full text | Current publication and access unverified | Access not attempted; not acquired | Not read | Only the existing bibliographic link is connected; current full-text location, public availability and access are unverified. |
| Registration | Current publication and access unverified | Access not attempted; not acquired | Not read | Original NCT03196908 identity; content/history are currently unread. |
| Protocol | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item; file existence/public availability, definitions, hierarchy and dates are unverified. |
| Statistical analysis plan | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item for crossover/conditions/time/missingness, contrasts and clinical collection scope. |
| Results, denominator and harm details | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item for biomarkers, effective n by condition, intervals and direct clinical-endpoint collection; unread materials are not changed to zero events. |
| Support and interests | Current publication and access unverified | Access not attempted; not acquired | Not read | Report-specific support/roles/current relationships are unread; 2019 support descriptions are not copied as individual 2017 disclosures. |

### R02

Fletcher EA, et al. Randomized Controlled Trial of High-Volume Energy Drink Versus Caffeine Consumption on ECG and Hemodynamic Parameters. J Am Heart Assoc. 2017;6:e004448. PMID: 28446495.

[PubMed](https://pubmed.ncbi.nlm.nih.gov/28446495/)

Materials actually read: Summary read; external materials not read  
Findings recorded in the summary: The earlier 2017 trial with overlapping investigators has only energy-drink-versus-caffeine bibliography and a summary of QTc prolongation direction. Sample, values, registration and clinical-event collection are unverified.  
Record level: Second report in the existing citations · Qualitative context of the parent counterview  
Independent replication: Shah 2019 pivotal direct biomarker trial and Fletcher 2017 earlier report with overlapping investigators. Actual participant/registration relationships are unverified; an identical cohort is not established. Mayo blood-pressure replication is qualitative stored-summary context without a bibliography; no R03 is created. Two checklists/conditions/time points are not summed.

| Material | Public availability | Access status | Actually read | Notes |
|---|---|---|---|---|
| Stored summary | Locally preserved summary | Local copy acquired | Summary read | The relevant bibliography, results and scope in the complete stored summary were read for preparation; this is not external full-text reading. |
| External abstract | Current publication and access unverified | Access not attempted; not acquired | Not read | Only the citation URL in the review summary is connected; no current abstract/access verification was made. |
| External full text | Current publication and access unverified | Access not attempted; not acquired | Not read | Only the existing bibliographic link is connected; current full-text location, public availability and access are unverified. |
| Registration | Current publication and access unverified | Access not attempted; not acquired | Not read | 2017 registration identifier is absent from the review summary; the 2019 identifier is not copied. |
| Protocol | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item; file existence/public availability, definitions, hierarchy and dates are unverified. |
| Statistical analysis plan | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item for crossover/conditions/time/missingness, contrasts and clinical collection scope. |
| Results, denominator and harm details | Current publication and access unverified | Access not attempted; not acquired | Not read | Required material item for biomarkers, effective n by condition, intervals and direct clinical-endpoint collection; unread materials are not changed to zero events. |
| Support and interests | Current publication and access unverified | Access not attempted; not acquired | Not read | Report-specific support/roles/current relationships are unread; 2019 support descriptions are not copied as individual 2017 disclosures. |

## Review criteria and methods

These are Chamgap's own application conditions, informed by the relevant sections of official methodological guidance. They do not constitute official assessment-tool certification or a new efficacy score.

- M03 [Cochrane Handbook 6.5 (2024), chapter updated 2023-08](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-03) · §3.1, §3.2.1–3.2.3, MECIR C5/C7/C13 · Clearly record the question, eligibility conditions and reasons for changes, and distinguish variations in interventions. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work.
- M04 [Cochrane Handbook 6.5.1 (2025), chapter updated 2025-03](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-04) · §4.5, §4.6.1–4.6.3, MECIR C42 · Distinguish studies from reports and link them; do not omit a study solely because results are unreported. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work.
- M08 [Cochrane Handbook 6.5 (2024), chapter updated 2019-10](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-08) · §8.1–8.2.3, Table 8.2.a · Define the outcome and effect of interest, then examine randomization, deviations, missing data, measurement and selective reporting. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work.
- M15 [Cochrane Handbook 6.5 (2024), chapter updated 2023-08](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-15) · §15.2.4, §15.3.1–15.3.3 · Distinguish effect estimates, intervals, importance and applicability. Sample size alone does not determine precision. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work.
- M19 [Cochrane Handbook 6.5 (2024), chapter updated 2019-10](https://www.cochrane.org/authors/handbooks-and-manuals/handbook/current/chapter-19) · §19.1.2, §19.2.1–19.2.4 · Harm questions may require different designs, populations and follow-up from efficacy questions. Case reports do not establish incidence rates. · Methodological principles stated in existing pilot materials and condition templates were referenced. The methodological text was not reviewed again in this work.

## What the statuses mean

- Met: The original content has been reviewed as meeting the conditions. This status is not used in this preparation.
- Partly verified: Some information in the stored summary was linked during preparation; clinical verification or review is not complete.
- Unverified: Required direct values, definitions or materials have not been established within the current storage and reading scope. This does not mean zero effect, no papers or failed access.
- Review incomplete: Review of existing content or actual review incomplete.
- Not reported: Used only when original materials were actually read and the outcome was judged unreported. Not used for external materials unread in this work.
- Inaccessible: Used only when an actual access attempt has a recorded failure. Not used for access that was not attempted in this work.
- Insufficient evidence for the conditions: Indicates insufficient direct materials for the relevant scope or conditions; it is not a new grade.
- Not applicable: Used when the reason it does not apply to the original question is stated.
- Conflicting data: Retains the scope of conflicting statements in original materials; it is not an arbitrary reassessment.

## Change history

2026-10-12 · Public page/materials 1.0. Public reader pages and materials were prepared from the existing 38 items. No new clinical search, verification-status change or scoring was performed.