论文部分内容阅读
如前所述,冲动在心脏组织内的扩散受许多解剖与生理因素的影响。因此,传导障碍或传导阻滞常系多种电生理紊乱相互作用的结果。普遍认为,引起传导阴滞最常见机理之一是在行进的兴奋波之前,有一不应性或无反应的组织。经典的心脏生理学指出,心肌纤维兴奋之后有一个不应期,此时这些纤维对任何强度的刺激均无反应,或仅对比电舒张期发生者更强的刺激才起反应。最近,Rosenbaum等将发生在上述不应期的冲动阻滞命名为第三位相阻滞,其前提是冲动必须在跨膜动作电位第三位相(或终末快速复极相)时抵达阻
As mentioned earlier, impulsivity in heart tissue is affected by many anatomical and physiological factors. Therefore, conductive or conductive block is often the result of a variety of electrophysiological disorders. It is generally accepted that one of the most common mechanisms responsible for conduction-induced debility is an inanitary or non-responsive tissue prior to the excited waves of travel. Classical cardio-physiology states that there is a refractory period after cardiac fibrillation, at which point the fibers do not respond to any intensity stimulus or respond only to stronger stimuli than those that occur during electrical diastole. Rosenbaum et al. Recently named the impulse block in the above refractory period as the third phase block, provided that the impulse must arrive at the third phase of the transmembrane action potential (or terminal fast repolarization phase)