心功能不全时的心律失常

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尽管近年来心血管疾病的患病率有所下降,但心功能不全的发生率则上升了,而且其死亡率仍然很高,心功能不全的死因包括2个方面:①快速室性心律失常及缓慢心律失常;②泵衰竭。心功能不全时心律失常的发生机制  在心功能不全时的心律失常的原因很多,慢性心梗时的心肌纤维化易发生折返性心律失常,扩张性心肌病时常可见到束支折返性室性心动过速。而有很多实验结果显示,心功能不全时的心律失常往往与心内膜下心肌自律性增高或触发活动有关,在肥厚的心肌以及衰竭的心肌可见到动作电位时程延长,有助于早期去极化的产生,此外肌浆网内钙离子自发性
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