Coffee vs. AFib: can ditching your morning cup keep your heart in rhythm?

NCT ID NCT05121519

Completed Disease control Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether stopping coffee helps prevent atrial fibrillation (AFib) from returning after a heart shock treatment called cardioversion. Two hundred coffee drinkers with AFib were randomly assigned to either keep drinking coffee or avoid it for six months. Researchers tracked how many people in each group had another AFib episode.

What this could mean

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

Active substance: coffee
What this could lead to: If quitting coffee reduces AFib recurrence, it could offer a simple lifestyle change to help manage the condition.
What could go wrong: This is a small, completed trial. Results may not apply to everyone, and quitting coffee might not make a difference for all patients.

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

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Conditions

The condition(s) this trial relates to.

atrial fibrillation

As listed by the trial registrant

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

ATRIAL FIBRILLATION COFFEE

Contacts and locations

Locations

Royal Adelaide Hospital

Adelaide, Australia
Sunnybrook Health Science Centre

Toronto, Canada
UCSF Parnassus

San Francisco, California, 94143, United States

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