New York— More than 400,000 people have signed up for a Stanford University study being sponsored by Apple to examine whether Apple Watch can detect patients with undiagnosed heart-rhythm problems, one of the largest heart screening studies ever to be conducted. The study, details of which were published on Thursday by Stanford University researchers, will use the watch’s sensors to detect possible atrial fibrillation. People who have the condition are at risk of blood clots and strokes. In the US, it causes 750,000 hospitalisations a year and contributes to 130,000 deaths, according to the Centers for Disease Control and Prevention. Devices such as phones and Apple’s digital watch offer exciting new possibilities for researchers, as they contain sensors and other data-collection tools that huge numbers of people keep with them almost all the time. A total of 419,093 people have enrolled in the Stanford study, and results are expected next year. “One of the most exciting things in t...

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