arrhythmia AE extrasystoles AE 早搏（额外收缩） JX, LW, YH Extrasystoles AE is an arrhythmia AE that shows a premature contraction of the heart that is independent of the normal rhythm of the heart and arises in response to an impulse in some part of the heart other than the normal impulse from the sinoatrial node. The extrasystole is followed by a pause, as the heart electrical system "resets" itself and the contraction following the pause is usually more forceful than normal. 早搏 心脏期前收缩 期外收缩 期前收缩 WEB: http://www.medicinenet.com/script/main/art.asp?articlekey=32159 早博 MedDRA: 10015856