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At least 2.7 million people in the United States have atrial fibrillation, or an irregular heartbeat sometimes known as AFib. According to the American Heart Association, the risk for strokes among people with untreated AFib is five times as high as for those without. They are also twice as likely to die of a heart-related condition. Even so, says Judy Lenane, chief clinical officer for iRhythm Technologies, many AFib patients don't even know they have it.
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