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Premature Atrial ContractionsCRAVENCT03671759

Coffee and Real-time Atrial and Ventricular Ectopy

A study testing Start: On Caffeine and Start: Off Caffeine in people with Premature Atrial Contractions and Premature Ventricular Contractions, run by University of California, San Francisco at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Atrial fibrillation (AF) and heart failure (HF) are morbid, costly, and incompletely understood diseases that have reached epidemic proportions worldwide. A dose-dependent relationship exists between premature atrial and ventricular contractions (PACs and PVCs) and development of AF and HF, respectively. Read more about this study

Who is it for?
Ages 18 years and olderHealthy volunteers can take part
What is being tested?
Start: On Caffeine and Start: Off Caffeine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
108 participants
Where
1 siteUnited States
Study dates
1 May 2019to 25 Mar 2020
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Are age 18 or older
  • Have a smartphone
  • Are able to use the Eureka mobile application
  • Are willing to provide a saliva sample for genetic processing
  • Drink coffee or coffee-based products at least once a year
  • Are willing to abstain from coffee, caffeinated products, or minimally caffeinated products (decaffeinated coffee) for at least 2 days when instructed

Who cannot join

  • Have a history of atrial fibrillation, heart failure
  • Have an ICD or pacemaker
  • Have treatment with beta blockers, non-dihydropyridine calcium channel blockers, or Vaughn-Williams class 1 or 3 antiarrhythmic medications
  • Have a medical reason to avoid coffee

Trial locations and contacts

1 site in 1 country.

United States1 site
  • University of California, San Francisco

    San Francisco, California, 94143

Other trials in United States

About this study

Atrial fibrillation (AF) and heart failure (HF) are morbid, costly, and incompletely understood diseases that have reached epidemic proportions worldwide. A dose-dependent relationship exists between premature atrial and ventricular contractions (PACs and PVCs) and development of AF and HF, respectively. Identifying and understanding the mechanisms of additional modifiable risk factors for ectopy has the potential to markedly reduce the healthcare burden of these diseases. In considering how to modify the prevalence of these ectopic beats, the investigators believe common exposures in daily life are prime candidates. Current guidelines suggest that caffeine may be an important trigger for frequent ectopy, although large population-based studies have not demonstrated an association between caffeine consumption and development of clinically significant arrhythmias. No study has employed an actual randomization intervention to assess the effects of caffeine on cardiac ectopy. Utilizing the Eureka platform, the investigators plan to utilize the N-of-1 strategy to rigorously investigate the real-time effect of caffeine intake on ectopy.

Read the detailed description

This study is designed as a N to 1 randomized trial, where each participant will be randomized to consume or abstain from coffee each day of a 14 day monitoring period. Participants will wear an automatically recording electrocardiographic monitor (ZIO® XT Patch), continuous glucose monitor (Dexcom G6), and a fitness tracker (Fitbit INSPIRE) while utilizing Eureka-a mobile application. We will compare participant self-report of caffeine consumption, glucose monitoring, fitness levels, sleep health, and heart rhythm data in order to better understand the relationship between acute caffeine consumption and heart rhythm changes. Participants will also be genotyped for caffeine metabolism-related SNPs. A total of 100 participants will be enrolled at the UCSF study site.

Being tested
Start: On Caffeine, Start: Off Caffeine
Keywords
Caffeine, Coffee, Arrhythmias, Palpitations, Cardiac ectopy, PACs, PVCs
Medical subject headings
Atrial Premature Complexes, Ventricular Premature Complexes, Arrhythmias, Cardiac

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Start: On CaffeineBehavioural

    In this two-day block, participants will be instructed to consume caffeine for one day and avoid caffeine the next day.

  • Start: Off CaffeineBehavioural

    In this two-day block, participants will be instructed to avoid caffeine for one day and consume caffeine the next day.

Study groups in NCT03671759
Study groupRoleWhat they receive
Experimental: N-of-1ExperimentalParticipants will be randomized in two-day blocks to consume then avoid caffeine ("Start: On Caffeine") or avoid then consume caffeine ("Start: Off Caffeine"). Using an N-of-1 strategy delivered by the NIH-funded, UCSF-run Eureka platform utilizing a mobile smartphone-based application, participants will receive instructions and answer questions to help us understand the relationship between caffeine and heart rhythm.
Receives: Behavioral: Start: On Caffeine; Behavioral: Start: Off Caffeine

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change in PAC frequency

    Participants will be wearing a continuously recording ECG monitor for two weeks. The primary outcome will be change in premature atrial contraction (PAC) frequency due to caffeine consumption or avoidance during the enrollment period.

    Measured: Baseline and after completion of coffee consumption, up to 2 weeks

Secondary outcomes (6)
  1. Change in SVT episodes

    Participants will be wearing a continuously recording ECG monitor for two weeks. A secondary outcome will be change in supraventricular tachycardia (SVT) episodes due to caffeine consumption or avoidance during the enrollment period.

    Measured: Baseline and after completion of coffee consumption, up to 2 weeks

  2. Change in VT episodes

    Participants will be wearing a continuously recording ECG monitor for two weeks. A secondary outcome will be change in ventricular tachycardia (VT) episodes episodes due to caffeine consumption or avoidance during the enrollment period.

    Measured: Baseline and after completion of coffee consumption, up to 2 weeks

  3. Mean daily glucose levels

    Participants will be wearing a continuous glucose monitor (Dexcom G6) that will record serum glucose levels. A secondary outcome will be difference in mean daily glucose levels due to caffeine consumption or avoidance during the enrollment period.

    Measured: 2 weeks

  4. Mean step count

    Participants will be wearing a fitness tracker (Fitbit INSPIRE) that will record step counts. A secondary outcome will be difference in mean step counts due to caffeine consumption or avoidance during the enrollment period.

    Measured: 2 weeks

  5. Mean sleep duration

    Participants will be wearing a fitness tracker (Fitbit INSPIRE) that will record sleep duration. A secondary outcome will be difference in mean sleep duration due to caffeine consumption or avoidance during the enrollment period.

    Measured: 2 weeks

  6. Change in PVC frequency

    Participants will be wearing a continuously recording ECG monitor for two weeks. The primary outcome will be change in ventricular contraction (PVC) frequency due to caffeine consumption or avoidance during the enrollment period.

    Measured: Baseline and after completion of coffee consumption, up to 2 weeks

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted14 Sep 2018
  2. Study start1 May 2019
  3. Primary completion25 Mar 2020
  4. Study completion25 Mar 2020

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Other
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
108 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03671759
Sponsor's protocol ID
18-25195
Acronym
CRAVE
Status last verified
Oct 2022
First submitted
12 Sep 2018
Last updated
7 Oct 2022
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Chugh SS, Blackshear JL, Shen WK, Hammill SC, Gersh BJ. Epidemiology and natural history of atrial fibrillation: clinical implications. J Am Coll Cardiol. 2001 Feb;37(2):371-8. doi: 10.1016/s0735-1097(00)01107-4.

    PubMed 11216949
  • Coyne KS, Paramore C, Grandy S, Mercader M, Reynolds M, Zimetbaum P. Assessing the direct costs of treating nonvalvular atrial fibrillation in the United States. Value Health. 2006 Sep-Oct;9(5):348-56. doi: 10.1111/j.1524-4733.2006.00124.x.

    PubMed 16961553
  • Roger VL, Go AS, Lloyd-Jones DM, Benjamin EJ, Berry JD, Borden WB, Bravata DM, Dai S, Ford ES, Fox CS, Fullerton HJ, Gillespie C, Hailpern SM, Heit JA, Howard VJ, Kissela BM, Kittner SJ, Lackland DT, Lichtman JH, Lisabeth LD, Makuc DM, Marcus GM, Marelli A, Matchar DB, Moy CS, Mozaffarian D, Mussolino ME, Nichol G, Paynter NP, Soliman EZ, Sorlie PD, Sotoodehnia N, Turan TN, Virani SS, Wong ND, Woo D, Turner MB; American Heart Association Statistics Committee and Stroke Statistics Subcommittee. Heart disease and stroke statistics--2012 update: a report from the American Heart Association. Circulation. 2012 Jan 3;125(1):e2-e220. doi: 10.1161/CIR.0b013e31823ac046. Epub 2011 Dec 15. No abstract available.

    PubMed 22179539
  • Dewland TA, Vittinghoff E, Mandyam MC, Heckbert SR, Siscovick DS, Stein PK, Psaty BM, Sotoodehnia N, Gottdiener JS, Marcus GM. Atrial ectopy as a predictor of incident atrial fibrillation: a cohort study. Ann Intern Med. 2013 Dec 3;159(11):721-8. doi: 10.7326/0003-4819-159-11-201312030-00004.

    PubMed 24297188
  • Dukes JW, Dewland TA, Vittinghoff E, Mandyam MC, Heckbert SR, Siscovick DS, Stein PK, Psaty BM, Sotoodehnia N, Gottdiener JS, Marcus GM. Ventricular Ectopy as a Predictor of Heart Failure and Death. J Am Coll Cardiol. 2015 Jul 14;66(2):101-9. doi: 10.1016/j.jacc.2015.04.062.

    PubMed 26160626
  • Blomstrom-Lundqvist C, Scheinman MM, Aliot EM, Alpert JS, Calkins H, Camm AJ, Campbell WB, Haines DE, Kuck KH, Lerman BB, Miller DD, Shaeffer CW, Stevenson WG, Tomaselli GF, Antman EM, Smith SC Jr, Alpert JS, Faxon DP, Fuster V, Gibbons RJ, Gregoratos G, Hiratzka LF, Hunt SA, Jacobs AK, Russell RO Jr, Priori SG, Blanc JJ, Budaj A, Burgos EF, Cowie M, Deckers JW, Garcia MA, Klein WW, Lekakis J, Lindahl B, Mazzotta G, Morais JC, Oto A, Smiseth O, Trappe HJ; European Society of Cardiology Committee, NASPE-Heart Rhythm Society. ACC/AHA/ESC guidelines for the management of patients with supraventricular arrhythmias--executive summary. a report of the American college of cardiology/American heart association task force on practice guidelines and the European society of cardiology committee for practice guidelines (writing committee to develop guidelines for the management of patients with supraventricular arrhythmias) developed in collaboration with NASPE-Heart Rhythm Society. J Am Coll Cardiol. 2003 Oct 15;42(8):1493-531. doi: 10.1016/j.jacc.2003.08.013. No abstract available.

    PubMed 14563598
  • Dixit S, Stein PK, Dewland TA, Dukes JW, Vittinghoff E, Heckbert SR, Marcus GM. Consumption of Caffeinated Products and Cardiac Ectopy. J Am Heart Assoc. 2016 Jan 26;5(1):e002503. doi: 10.1161/JAHA.115.002503.

    PubMed 26813889
  • Marcus GM, Rosenthal DG, Nah G, Vittinghoff E, Fang C, Ogomori K, Joyce S, Yilmaz D, Yang V, Kessedjian T, Wilson E, Yang M, Chang K, Wall G, Olgin JE. Acute Effects of Coffee Consumption on Health among Ambulatory Adults. N Engl J Med. 2023 Mar 23;388(12):1092-1100. doi: 10.1056/NEJMoa2204737.

    PubMed 36947466

Questions about this trial

What is this clinical trial studying?

A study testing Start: On Caffeine and Start: Off Caffeine in people with Premature Atrial Contractions and Premature Ventricular Contractions, run by University of California, San Francisco at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 7 Oct 2022. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change in PAC frequency (time frame: Baseline and after completion of coffee consumption, up to 2 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT03671759, which also lists 8 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 Oct 2022.

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