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Apple Watch for Atrial Fibrillation Monitoring After Surgery

This study is looking at how well the Apple Watch AFib History tool can track atrial fibrillation (AFib), a type of irregular heartbeat, after surgery. It compares the Apple Watch's results to those from a standard monitoring device called the Zio Patch. You might be able to join if you are 22 or older, have a history of AFib, and are having mitral valve surgery with a specific procedure called Cox-Maze IV ablation. The main goal is to see how accurate the Apple Watch is at measuring AFib over one year after your surgery. The study is currently unclear on its enrollment status and plans to include 75 participants.

Study design
This is an observational study comparing two devices in 75 participants. Each participant will use both the Apple Watch and the Zio Patch concurrently.
What's involved
You will have monitoring periods at 1 month, 3 months, 6 months, and 1 year after surgery. You will also complete questionnaires at the start and during follow-up.
Compensation
Not stated in the trial record.
Follow-up
Participants will be followed for up to 1 year after their surgery.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.

NCT07122947

Surveillance Trial of the Apple Watch in Reliable Burden Assessment in Unseen Recurrence of Surgically Treated AF

Recruiting
Not specifiedAges 22+Observational
The Cleveland Clinic
~75 participants
Updated 2026-09-08 on ClinicalTrials.gov
What's tested:Apple Watch: AFib HistoryZio Patch

At a glance

Recruiting sites
2 of 2 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Accuracy of AF burden
Measured over From enrollment to 1 year postoperatively

Conditions

Atrial Fibrillation

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Atrial Fibrillation

NCT07122947

Where you'd take part

This study runs at 2 sites. They're the same protocol — you choose where, and that choice sets who your contact draft is addressed to.

  • Cleveland Clinic

    Cleveland, Ohiostudy coordinator listed

    Recruiting

  • Washington University School of Medicine in St. Louis

    St Louis, Missouristudy coordinator listed

    Recruiting

Sites open and close at different times, so the status above is per site — it can differ from the study's overall status.

Study leadership

  • Marc Gillinov, MD · PRINCIPAL_INVESTIGATOR · The Cleveland Clinic

Who to contact

Nadia Bakir, MD
[email protected]
216-312-4443
Email the study team

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Eligibility criteria

Inclusion

22 years of age or older
Documented or current history of atrial fibrillation (paroxysmal, persistent, or long-standing persistent)
Undergoing elective mitral valve surgery (repair or replacement) with concomitant surgical ablation using a Cox-Maze IV lesion set and left atrial appendage occlusion procedure, with and without concomitant tricuspid valve procedure (repair or replacement)
Use or access to Apple iPhone
Willing and able to provide informed consent and wear both the Apple Watch and Zio Patch at pre-specified intervals for the duration of the study period
Willing and able to participate in long-term follow up including study visits and surveys

Exclusion

Presence of a cardiac pacemaker
Heart failure with reduced ejection fraction (\<40%)
Concomitant aortic valve replacement or coronary artery bypass graft
Personal or family history of adhesive skin allergies to adhesives or hydrogels
Tattoos located on the skin of the wrist or forearm where the Apple Watch will be placed
Pregnancy

What this trial measures

  • Accuracy of AF burdenFrom enrollment to 1 year postoperatively

    This will be measured by comparing the weekly AF burden estimates from the Apple Watch AF History feature to the Zio Patch ambulatory ECG monitoring device. Weekly AF burden is defined as the percentage of time in AF over the prior seven consecutive days and will be measured at 3 months, 6 months, and 1 year postoperatively.