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正常情况下,窦房结作为起搏点控制其它自律组织(结间束、房间束、房室交界和房室束支等)的活动而产生窦性节律。目前认为窦房结的这种控制主要通过两种方式来实现。 1.抢先占领:由于窦房结的自律性高于其它潜在起搏点,所以在后者4期自动去极尚未达到阈电位水平之前,它们已经受到窦房结发出并依次传布而来的兴奋所激动而产生动作电位,其本身的自动兴奋就不可能出现,这就是自律性最高组织能够起主导作用的原因。 2.超速抑制:在自律性最高的窦房结兴奋驱动下,潜在起搏点被动兴奋的频率远远超
Under normal circumstances, the sinus node as a pacemaker to control other self-regulatory organizations (intercostal bundle, room bundle, atrioventricular junction and atrioventricular bundle branch, etc.) activity and produce sinus rhythm. At present, this control of the sinus node is mainly achieved by two ways. 1. Preemptive Occupation: As the sinus node autonomy is higher than other potential pacemaker points, so in the latter 4 automatically go to the threshold has not yet reached the threshold level, they have been issued by the sinus node and in turn spread from the excitement Excited by the action potential, its own automatic excitement can not appear, this is the highest self-regulatory organizations can play a leading role. 2. Overspeed inhibition: In the highest self-discipline sinus node excitation-driven, potential passive pace of pacemaker frequency far surpassed