It watches the heartbeat, probably arrhythmias specifically. You can't monitor b... | Hacker News

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		BjoernKW on Sept 24, 2019 \| parent \| context \| favorite \| on: Bike crash left Spokane man unconscious, so his Ap... It watches the heartbeat, probably arrhythmias specifically. You can't monitor blood pressure with just a watch. You need a blood pressure cuff for that.

Symmetry on Sept 25, 2019 | [–]

The Apple watch can look at blood oxygen levels too which might have been what triggered the alert.

swayvil on Sept 25, 2019 | [–]

Does it watch heartbeat via the gyroscope? If so then that's a darn sensitive gyroscope.

defap on Sept 25, 2019 | [–]

Via an optical sensor that can perform photoplethysmography.

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