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阵发性室上性心动过速(室上速)是指源于希氏束以上的一种常见的快速型心律失常。一.机制:至今认识到有三种机制即折返激动、自律性增强及触发活动。折返是主要机制,自律性增强者不及5%,而触发活动的临床意义尚待进一步研究。折返的基础是心脏房室间或房室结内存在传导速度不同和不应性不同的途径使激动得以在其中循环反复。神经性、生理性及病理性原因都可以改变组织传导性和应激性,导致折返激动的形成。
Paroxysmal supraventricular tachycardia (SVS) is a common type of tachyarrhythmia that originates from more than a His bundle. I. Mechanism: So far, three mechanisms have been recognized, namely, rejuvenation, self-discipline enhancement and triggering activities. Reentry is the main mechanism, less than 5% self-discipline enhancer, and the clinical significance of triggering activity remains to be further studied. The basis of reentry is the way in which there is a difference in conduction velocity and non-responsiveness in the heart atrioventricular node or atrioventricular node, so that the stimulus can be circulated repeatedly therethrough. Neurogenic, physiological, and pathological causes can both change tissue conductivity and stress, resulting in the formation of reentry activation.