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The Apple Watch can detect atrial fibrillation: so what now?

The Apple Heart Study demonstrates that the Apple Watch can detect atrial fibrillation inferred from the smartwatch heart-rate sensor with a high positive predictive value. However, we must now contend with many clinically relevant unknowns that were not addressed by the study, such as the ramifications of a false-positive result.

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Fig. 1: Inversion of the conventional workflow of scientific discovery.


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Correspondence to Gregory M. Marcus.

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Competing interests

G.M.M. has received research funding from Jawbone and Eight and consulting fees as a steering committee member for Johnson & Johnson. He also holds equity as a co-founder of InCarda and is a consultant for InCarda.

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Marcus, G.M. The Apple Watch can detect atrial fibrillation: so what now?. Nat Rev Cardiol 17, 135–136 (2020).

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