To me, it's an issue of scale as much as anything. The Apple Watch will throw up about 8,000 false positives in a population of 1 million Sales of the watch reached 8 million per quarter recentlyhttps://twitter.com/rjalex/status/1074763789902462976 …
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There also has not been any benefit demonstrated of screening for AF, particularly in younger/asymptomatic patients, which is why current guidelines do not recommend itpic.twitter.com/TmssrwLSy9
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It's also worth noting that the 99.6% specificity is from Apple's own study, of just 600 patients. Other studies with similar designs have found real-world specificities of 75-80%, which would make the outlook much worse
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If the real-world specificity is actually 80%, then for every 1 million people with the watch there will be just under 200,000 misdiagnoses That is a HUGE problem
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