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Illustration shows the Einthoven triangle and how to use the Apple Watch to record leads I through III.
From Behzadi A, Sepehri Shamloo A, Mouratis K, Hindricks G, Arya A, Bollmann A. Feasibility and reliability of smartwatch to obtain 3-lead electrocardiogram recordings. Sensors (Basel) 2020;20(18):5074.13 Used under the terms of the Creative Commons CC-BY license.
