Atrial Fibrillation detection defined

This post on 9to5mac has this response which explains a lot!

Atrial fibrillation with a rapid ventricular response is not appropriately measured/monitored with a photoplethysmogram. The nature of atrial fibrillation is that the beats are irregular, and with a very fast rate the individual beats will not reliably perfuse the extremities, at least not to a level that can be consistently detected by an external device. It is a case of having the wrong tool for the job, rather than the tool functioning incorrectly. The best tool for the job is an implantable loop recorder–this measures continuous cardiac electrical activity (ECG) and will readily detect A-fib with RVR.

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