Can a smartwatch save your life?

On a recent Saturday, my 87-year-old mother was feeling a bit woozy, so she pressed a button on the side of her Apple Watch to reveal her ECG, a recording of her heart’s electric rhythm. Thirty seconds later, three messages appeared on the watch’s screen. One showed the characteristic zigzag spikes of the ECG, or electrocardiogram. The second revealed that her heart rate, usually 80 beats per minutes, was down to only 40. The third said the results were “inconclusive,” with the advice: “Call your doctor.”

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