CNET:

When I first started testing out the ECG feature on the Apple Watch Series 4 — which launched in December with the update to Watch OS 5.1.2 — the last thing I expected was to find something abnormal about my heart rhythm. But that’s exactly what happened when I was cross-referencing the Watch’s readings with medical-grade EKG equipment at the doctor’s office.

“We see on your Apple Watch the same early heartbeat that we see on the EKG,” said Dr. Gregory Marcus, professor of medicine and a cardiac electrophysiologist at UCSF Medical Center, as I sat on the hospital bed with cables attached to my body and an Apple Watch Series 4 on my wrist.

As I said in my newsletter this AM, these are exactly the results I would expect. The Apple Watch ECG feature isn’t a toy or a gimmick.