Harvard Heart Letter

Heart rhythm monitoring with a smartwatch

These wrist-worn devices are better than ever at gathering data. But itís still too early to use them to screen for atrial fibrillation. The original wristband monitors were pretty basic: they tracked your movement and tallied your daily steps. But before long, these digital devices could also estimate your heart rate, thanks to a sensor that measures changes in blood flow through your skin. Now, there are smartwatches with special sensors that…

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