综述近年来,临床与实验观察证实有二种心率依赖型束支传导障碍一种发生在心率快速时,又称第3位相束支阻滞;另一种出现在心率缓慢或较长的舒张问期后,又称第4位相束支阻滞。当心率不过快或过慢时,室内传导正常。如果一侧束支已完全阻滞,而对测束支又发生上述第3位相或第4位相阻滞,可以引起随心率减慢或增快而出现的阵发性房室传导阻滞。 Summary In recent years, clinical and experimental observations confirmed that there are two kinds of heart rate-dependent bundle branch conduction occurs in a fast heart rate, also known as the third phase bundle branch block; the other appears in slow heart rate or longer diastolic After the period, also known as the first four phase bundle branch block. When the heart rate is too fast or too slow, indoor conduction is normal. If the bundle branch has been completely blocked on one side and the third or fourth phase block on the beam branch occurs, paroxysmal atrioventricular block can occur as the heart rate slows or increases.