Decreased heart rate variability as a predictor for sudden death was known in China in the third century A.D.
Cheng
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D002309:Cardiology / Q000266:history; D002681:China; D016757:Death, Sudden, Cardiac; D006331:Heart Diseases / Q000266:history / Q000503:physiopathology; D006339:Heart Rate; D049690:History, Ancient; D006801:Humans