https://www.cnet.com/news/apple-watch-ecg-app-launches-in-hong-kong-and-europe/

Stanford and Apple released the full results of their heart study on March 16. The data showed that, of the 400,000 participants, 2,000 received an irregular heart rhythm alert. Fifty-seven percent of participants who received an irregular pulse notification went to the doctor. 

Apple News Plus service for news junkies: Get all the articles you want from select publishers.