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男,18岁。1984年12月因胸痛就诊。一周前有“上感”史,既往无器质性心脏病史。体查心脏无异征。 心电图分析(图见插页) 一、窦性心律不齐伴交界性逸搏。如图中Ⅱ所示:P波顺序发生,同导联P波形态相同,R—R间期0.76～1.12秒,P—R间期0.14秒。R_3属交界性逸搏,QRS前有未下传的窦性P波,无P—R段。二、位相3右束支传导阻滞。图中ⅡV_1左均可见R—R间期在0.76秒时,QRS波群呈完全右束支传导阻滞图形;R—R在0.84～1.12秒时,QRS波群恢复正常图形;R—R为0.50秒时全部呈右束支传导阻滞图形(V_1右)。由此可见,位相3束支传导阻滞的临界
Male, 18 years old. December 1984 due to chest pain. A week ago, “the sense of” history, past no organic heart disease history. Physical examination heart no sign. ECG analysis (see insert) First, sinus arrhythmia with borderline escape. As shown in Figure II: P wave sequence occurs, with the same lead P wave morphology, R-R interval 0.76 ~ 1.12 seconds, P-R interval of 0.14 seconds. R_3 is a borderline esophageal rhythm, there is no pre-QRS Sinus P waves, no P-R segment. Second, Phase 3 Right bundle branch block. In the Fig. ⅡV, the left R-R interval was 0.76 seconds, and the QRS complex showed a complete right bundle branch block. When R-R was between 0.84 and 1.12 seconds, the QRS complex returned to normal. R-R was At 0.50 seconds all showed a right bundle branch block pattern (V_1 right). Thus, the phase 3 bundle branch block the critical