Key result
Apple Watch ECG misidentifies atrial flutter as sinus rhythm, highlighting algorithm validation needs beyond AFib.
Why the study?
Consumer wearables are increasingly used to document palpitations, but their algorithms are almost exclusively validated for AF.
Does a single-lead Apple Watch ECG accurately detect atrial flutter compared to a standard 12-lead ECG in a patient with palpitations?
Case Report (n=1)
Does a single-lead Apple Watch ECG accurately detect atrial flutter compared to a standard 12-lead ECG in a patient with palpitations?
Smartwatch algorithms validated for atrial fibrillation may misclassify other supraventricular arrhythmias, such as atrial flutter with a regular ventricular response, highlighting the need for 12-lead ECG confirmation.
Requires 12-lead confirmation for smartwatch-detected rhythms; leaves open wearable algorithm accuracy for flutter beyond AF.
Consumer wearables are increasingly used to document palpitations, but their algorithms are almost exclusively validated for atrial fibrillation (AF). We report a 70-year-old man with recurrent palpitations, no prior cardiovascular history, and controlled hypertension. A single-lead Apple Watch ECG classified sinus rhythm at 75 bpm, while a same-day 12-lead ECG revealed typical atrial flutter with sawtooth waves and regular atrioventricular conduction. After adequate anticoagulation, the patient underwent successful electrical cardioversion with 120 J and remains in stable sinus rhythm. This case highlights that AF-validated smartwatch algorithms may miss other supraventricular arrhythmias, particularly with regular ventricular response. Smartwatches can aid AF screening and symptom capture, but persistent symptoms require confirmation with standard 12-lead ECG. Future work should prioritize algorithm refinement and rigorous, post-market validation beyond AF to ensure that consumer devices transition from wellness tools to clinically reliable instruments for arrhythmia management.
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Ratti et al. (2026) conducted a case report in atrial flutter (n=1). Apple Watch ECG vs. 12-lead ECG was evaluated on arrhythmia classification. An Apple Watch ECG misclassified typical atrial flutter as sinus rhythm in 1 patient, highlighting that AF-validated smartwatch algorithms may miss other supraventricular arrhythmias.
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