Thanks. I’m just amazed the ECG can be accurate from a watch on the wrist.
As an older person, it’s probably good to keep a check on my heart.
You just have to bear in mind that ECG is currently only warning of atrial fibrillation. There's far more a cardiologist can learn from an ECG than that.
As I see it, this is "enabling technology" - once the hardware capability has been installed it opens the door to all sorts of other software-enabled capabilities.
Due to many countries' laws regarding medical diagnostic products, those capabilities have to be thoroughly tested before they can be released to the public. So, the Apple Watch's ability to detect afib and other heart issues is no gimmick - it's just one of the first of many possible uses that has made it all the way through the legal/medical testing and licensing process. There will be more in the future.
Unlike the ECG in the doctor's office, the Watch is with you at all times. Unlike the heart rate monitor you may have in your bedroom, this one is monitoring your heart whenever the Watch is on your wrist. Not only does this mean you can catch potential crises as they occur, but your Watch is also collecting that data continuously - there's a whole lot a physician can learn when being able to view a large, long-term data set compared to what can be collected during a brief office visit.
So is it as accurate? Absolute accuracy isn't really the point. It's like the proverbial tree that falls in the forest. Of course it makes a sound. The trick is being there to hear it. It may not be as accurate or sensitive as a laboratory-grade medical device, but it's certainly good enough to be an early warning system.