少数预激综合征患者当心率超过临界值时预激波消失,提示旁道存在快频率依赖性传导阻滞.本文作者曾报道1例间歇性预激综合征患者,其旁道有效不应期异常延长,当窦性激动落在此不应期时旁道传导受阻,预激波消失,类似快频率依赖性束支传导阻滞表现.然而,间歇性预激综合征的旁道表现为慢频率依赖性传导 A few pre-excitation syndrome patients when the heart rate exceeds the critical value of the disappearance of pre-shock wave, suggesting that there is a fast frequency-dependent conduction block.We have reported one patient with intermittent WPW syndrome, the effective refractory period Abnormal prolongation, when the sinus motion falls in this refractory period, the bypass pathway is blocked and the pre-shock wave disappears, which is similar to the performance of the fast-frequency dependent bundle branch block.However, the side effects of intermittent WPW syndrome are slow Frequency-dependent conduction