患者男,65岁;临床诊断:冠心病。附图示:异位心搏呈rs形与窦性心搏形态相同,为交界区心律。窦性P波规律出现,大部分P波落在异位T波升支,P—P间期0.79s与R’—R’间期呈等频竞争;由于交界区起搏激动较窦性激动略提前故呈主导节律。窦性激动唯在异位搏动脱漏一次尚能夺获心室(见封三梯形图)。心室夺获未扰乱异位心律,证明交界区起搏点有传入阻滞保护;异搏间距呈整数倍数关系脱漏, Male patient, 65 years old; Clinical diagnosis: coronary heart disease. Attached figure: ectopic beats were rs-shaped sinus heart shape and the same as the border zone rhythm. The regularity of sinus P wave appeared. Most of the P wave was in the ascending branch of ectopic T wave. The interval between P-P 0.79s and R’-R ’showed equal frequency competition. A little premature was the dominant rhythm. Sinus excited only in the ectopic beat once missed the ventricular beat (see seal three ladder). Ventricular seizure did not disturb the ectopic rhythm, that the junction of the pacemaker has an access block protection; whisk interval was an integer multiple of the relationship between leakage,