Rationale and design of a large-scale, app-based study to identify cardiac arrhythmias using a smartwatch: The Apple Heart Study

• Published in: The American heart journal Vol. 207; pp. 66 - 75
• Main Authors: Turakhia, Mintu P., Desai, Manisha, Hedlin, Haley, Rajmane, Amol, Talati, Nisha, Ferris, Todd, Desai, Sumbul, Nag, Divya, Patel, Mithun, Kowey, Peter, Rumsfeld, John S., Russo, Andrea M., Hills, Mellanie True, Granger, Christopher B., Mahaffey, Kenneth W., Perez, Marco V.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.01.2019; Elsevier Limited
• Subjects: Algorithms; Arrhythmia; Atrial Fibrillation - diagnosis; Atrial Fibrillation - epidemiology; Atrial Flutter - diagnosis; Atrial Flutter - epidemiology; Cardiac arrhythmia; Collaboration; Consent; Data collection; EKG; Electrocardiography; Electrocardiography, Ambulatory - instrumentation; Fees & charges; Fibrillation; Fitness; Flutter; Health care; Health services utilization; Heart; Heart failure; Humans; Irregularities; Medical equipment; Medical personnel; Mobile Applications; Patient Acceptance of Health Care - statistics & numerical data; Patient Reported Outcome Measures; Physicians; Prospective Studies; Pulse rate; Screening; Smart devices; Smartphone; Smartphones; Smartwatches; Stroke; Telemedicine; Time Factors; Variability; Wearable Electronic Devices; Wearable technology; Wrist
• ISSN: 0002-8703; 1097-6744; 1097-6744
• DOI: 10.1016/j.ahj.2018.09.002

Smartwatch and fitness band wearable consumer electronics can passively measure pulse rate from the wrist using photoplethysmography (PPG). Identification of pulse irregularity or variability from these data has the potential to identify atrial fibrillation or atrial flutter (AF, collectively). The rapidly expanding consumer base of these devices allows for detection of undiagnosed AF at scale. The Apple Heart Study is a prospective, single arm pragmatic study that has enrolled 419,093 participants (NCT03335800). The primary objective is to measure the proportion of participants with an irregular pulse detected by the Apple Watch (Apple Inc, Cupertino, CA) with AF on subsequent ambulatory ECG patch monitoring. The secondary objectives are to: 1) characterize the concordance of pulse irregularity notification episodes from the Apple Watch with simultaneously recorded ambulatory ECGs; 2) estimate the rate of initial contact with a health care provider within 3 months after notification of pulse irregularity. The study is conducted virtually, with screening, consent and data collection performed electronically from within an accompanying smartphone app. Study visits are performed by telehealth study physicians via video chat through the app, and ambulatory ECG patches are mailed to the participants. The results of this trial will provide initial evidence for the ability of a smartwatch algorithm to identify pulse irregularity and variability which may reflect previously unknown AF. The Apple Heart Study will help provide a foundation for how wearable technology can inform the clinical approach to AF identification and screening.