Acknowledgment: The author thanks Paloma del Álamo for providing the Apple Watch; Javier Cobos del Álamo for language corrections; Luisa Lozano Gallego and Ana Martín Gómez for recording the ECGs; and José Luis de Unzueta, José Juan Gómez de Diego, Daniel Morales Salinas, and Angela McInerney for contributing to the video.

Disclosures: The author has disclosed no conflicts of interest. The form can be viewed at

Reproducible Research Statement:Study protocol: See the Supplement. Statistical code: Not available. Data set: Available from Dr. Miguel Ángel Cobos Gil (e-mail,

Cobos Gil MÁ. Standard and Precordial Leads Obtained With an Apple Watch. Ann Intern Med. 2019;:. [Epub ahead of print 26 November 2019]. doi:

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