患者女性、60岁、临床诊断:冠心病,心电图示:P波窦性、P—P间距规则、频率86次/min,P波与QRS波大部分无关,R—R规则、频率48次/min,为房室交界处逸搏节律。当逸搏起搏点激动下传通过左束支时,此时左束支因病变,激动在左束支内传导时间反而超过右束支0.04-0.06s以上,第2、3个QRS激动通过 Patient female, 60 years old, clinical diagnosis: coronary heart disease, electrocardiogram: P wave sinus, P-P spacing rules, frequency of 86 beats / min, P wave and QRS wave mostly irrelevant, R- min, for the atrioventricular junction escape rhythm. When the esophageal pacing stroke is excited and transmitted through the left bundle branch, the left bundle branch at this time due to lesions, the activation of the left bundle branch conduction time but more than the right bundle branch 0.04-0.06s above the 2nd and 3rd QRS excited by