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Rosenblueth认为A-VN文氏现象(WP)是A-VN内“一阶延迟”(1-step delay)所造成,而非递减传导引起,动物实验已证实这一观点(译者注:也可以是多阶延迟).本文应用在这一屏障水平的联距来估计A-VN的不应期,结果发现A-VN不应期和心动周期长短直接有关,在WP的发展中不断缩短.方法:采用心房内调搏诱发WP及倒WP.图1中心房起搏的周期为350ms,第一个刺激S_1未下传,S_2的联距(A_0A_2)为400ms,A_2H_2从原有的AH(A_0H_0)100增至115ms,以后1∶1下传,逐跳延长直至S_6在A-VN被阻滞.从梯形图A看出,A-VN传导是以递增的斜线度表示,此法虽然方便,但
Rosenblueth argues that A-VN Wen’s phenomenon (WP) is caused by “1-step delay” within the A-VN rather than by degenerative conduction, and animal experiments have confirmed this view. It can also be a multi-stage delay.) In this paper, we estimate the refractory period of A-VN by using the joint distance at this barrier level. We found that the A-VN refractory period is directly related to the cardiac cycle length, Methods: The atrial pacing was used to induce WP and down WP. The atrial pacing cycle in Fig.1 was 350ms. The first stimulus was not transmitted to S_1, and the distance between the two S_2 (A_0A_2) was 400ms. A_2H_2 shifted from the original AH (A_0H_0) 100 is increased to 115ms and then 1: 1 is downgraded, hop by hop until S_6 is blocked at A-VN. As can be seen from Ladder A, A-VN conduction is expressed in increasing obliqueness Although convenient, however