The Apple watch is being hailed a life saver in an article in the Sydney Morning Herald.
The writer recounts waking one morning feeling a little odd, along with several ailments that he may just put down to indigestion. He ignores these symptoms and decides to make a cup of tea however while putting on his Apple watch he decides to check the pulse on his right wrist, the beat wasn't right.
After getting confirmation via the Heart Rate Glance app on his watch then 2 more apps on his iPhone, he knew something was not right. He checked the Health app on his iPhone which collects the health and fitness data from the watch, confirming in a dashboard the irregularity and spiking of his heart beat.
With this knowledge he contacts his Doctor who suggested he get to his rooms immediately. The Doctor checks his vital signs & phoned for an ambulance. Minutes later the writer finds himself in hospital to be observed in the Cardiac unit for atrial fibrillation (the erratic heart beat) plus an angiogram. The next day a stent was installed in a blocked artery, a problem of which he knew nothing about.
So yes, this amazing technology alerted the writer to realise it wasn't simply the hangover of a big night but a life threatening episode.