单词	extrasystole
释义	extrasystole /ˌɛkstrəˈsɪst(ə)li / noun Medicine A heartbeat outside the normal rhythm, as often occurs in normal individuals.Ventricular tachycardia is defined as three or more ventricular extrasystoles in succession at a rate of more than 120 beats/min.... Toxic effects include anorexia, nausea, vomiting, headache, drowsiness, and visual disturbances, as well as extrasystoles and excessive slowing of the heart rate. Ventricular extrasystoles are also common and, in the context of the structurally normal heart, are almost always benign
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