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Does your morning coffee stir up heart rhythm trouble?

NCT ID NCT07823998

Knowledge-focused Sponsor: Jean-Benoît Le Polain de Waroux Source: ClinicalTrials.gov ↗

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 17, 2026 · Last updated Sep 18, 2026 · Updated 1 time

Summary

Researchers want to know whether caffeine consumption is linked to irregular heartbeats and daily physical activity in adults with heart failure, reduced left ventricular ejection fraction, and an implantable cardioverter-defibrillator (ICD). About 170 participants fill out a one-time questionnaire about coffee and other caffeine sources from the past week. The team then reviews heart rhythm data, heart rate, and activity already recorded by each person's ICD over the prior year. No extra visits, tests, or treatment changes are involved.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If a link appears, it could sharpen advice about coffee and exercise for people living with a defibrillator and weak heart pumping.
What could go wrong
This is an observational questionnaire study, so it can show associations but not cause and effect. People may misremember their caffeine intake, and the findings may not apply to other heart patients.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 170 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Oct 2026

An estimate. Start dates often move.

Expected to finish

Apr 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Patients with left ventricular systolic dysfunction (LVEF \<50%), i.e. HFrEF or HFmrEF, and an implantable cardioverter-defibrillator (ICD), including patients implanted with a cardiac resynchronization therapy defibrillator (CRT-D).

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Written informed consent obtained prior to any study procedure. 2. Age ≥18 years. 3. Left ventricular systolic dysfunction (LVEF \<50%), i.e. HFrEF or HFmrEF, documented on the most recent available transthoracic echocardiogram. 4. Presence of a transvenous implantable cardioverter-defibrillator (ICD), including cardiac resynchronization therapy defibrillators (CRT-D), implanted at least 12 months before the caffeine questionnaire. Exclusion Criteria: 1. Presence of channelopathies. 2. Subcutaneous implantable cardioverter-defibrillator (S-ICD), which does not provide ventricular ectopic beat counters, accelerometer-derived physical activity data or antitachycardia pacing, and therefore cannot generate the primary outcome measure. 3. Inability to complete the study questionnaire on coffee and caffeinated product consumption.

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Conditions

The condition(s) this trial relates to.

craniofacial microsomia impulse control disorder systolic heart failure

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HFMREF Hfref - heart failure with reduced ejection fraction ICD Ventricular arrhythmia

How to take part

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  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • AZ Sint-Jan Brugge

    Bruges, Belgium

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