It’s the first known time doctors used a fitness tracker to guide such a decision.

Doctor’s made a decision to shock a man’s heart back to rhythm based on his Fitbit data, showing that such devices can do far more than just track your exercise. The 42-year old patient arrive at an ER in Camden, New Jersey with an atrial fibrillation (a fast and irregular heartbeat), meaning he needed immediate medical treatment. But which kind? Using a defibrillator could trigger a stroke in some cases, but not using one could also trigger a stroke. Luckily they noticed he was wearing a Fitbit, and its data confirmed his abnormal heart rate happened around the same time he had a seizure.

According to a research paper, “it was noted that he was wearing a wrist activity tracker (Fitbit Charge HR) which was synchronized with an application on the patient’s smartphone, recording his pulse rate as part of a fitness program. [There was] an immediate persistent increase to a range of 140 to 160 bpm at the approximate time of the patient’s seizure.” That meant the arrhythmia wasn’t caused by a chronic condition, meaning it was unlikely that the patient had a blood clot that could be dislodged by a defibrillation. Based on that information, the team elected to do an electrical cardioversion, shocking the patient’s heart back to a normal rhythm.

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