论文部分内容阅读
室性早搏的发生机理主要有二:自律性增高与折返机理。一、自律性增高:任何传导系统,由于4相逐渐自发除极,当达到阈电位时,即可产生自身节律。引起自律性增高的条件主要有:①4相坡度增加或舒张除极速度增快;②阈电位降低(即阈电位值更负);③静息电位负值减
There are two main mechanisms of premature ventricular contractions: increased self-discipline and reentry mechanism. First, increased self-discipline: any conduction system, due to gradually spontaneous 4 phase depolarization, when the threshold potential, you can produce their own rhythm. Caused by increased self-discipline conditions are: ① 4-phase gradient increase or diastolic depolarization speed; ② threshold potential decreased (ie, more negative threshold value); ③ resting potential negative minus