Accuracy of the Apple Watch for Detecting Atrial Fibrillation
Author Information
Author(s): Wasserlauf Jeremiah MD, MS, Vogel Kelly BS, Whisler Cailin MPH, Benjamin Emelia MD, ScM, Helm Robert MD, Steinhaus Daniel A. MD, Yousuf Omair MD, Passman Rod S. MD, MSCE
Primary Institution: North Shore University Health System, Evanston, Illinois, USA
Hypothesis
The study aims to determine the accuracy of the Apple Watch's irregular rhythm notification feature in detecting atrial fibrillation in patients with a history of nonpermanent AF.
Conclusion
The Apple Watch's irregular rhythm notification feature showed high specificity and a low rate of false positives, but its sensitivity for detecting atrial fibrillation was lower.
Supporting Evidence
- Eight out of eleven subjects with AF were detected by the Apple Watch.
- The watch had a sensitivity of 72% and specificity of 100% for detecting AF by subject.
- Only one false positive detection occurred during the study.
- Thirty participants were enrolled from three hospital systems.
- Participants were asked to wear the watch for at least 14 hours a day.
Takeaway
The Apple Watch can help detect a heart condition called atrial fibrillation, but it might miss some cases.
Methodology
Participants with a history of nonpermanent AF wore an Apple Watch for 6 months, and AF episodes were compared between the watch and implanted cardiac devices.
Potential Biases
The accuracy may vary based on skin tone due to the device's photoplethysmography technology.
Limitations
The study had a small sample size and the Apple Watch must be removed for charging, which may lead to missed AF episodes.
Participant Demographics
Mean age was 65.4 years, with 40% female participants.
Statistical Information
Statistical Significance
p = .635
Digital Object Identifier (DOI)
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