患者女性,22岁,临床诊断:病毒性心肌炎。附图(见第170页)为V_1导联连续描记:P波直立,P-R间期恒定为0.12秒,其后之QRS波正常。提早之P′波,联律间期固定为0.50秒,呈二联律。P′-R′为0.14-0.20。秒,P′后之QRS波形态多变,分别为LBBB型、RBBB型及介于两者之间的混合型3种。QRS形态及P′-R′的变化均与其前周期长短无关。心电图诊断:1.窦性心律;2. Female patient, 22 years old, clinical diagnosis: viral myocarditis. The drawing (see page 170) is a continuous trace of the V_1 lead: the P wave is upright, the P-R interval is constant at 0.12 seconds and the subsequent QRS wave is normal. Early P ’wave, the joint law interval is fixed at 0.50 seconds, was a binary law. P’-R ’is 0.14-0.20. S, QRS waveforms after P ’varied. They are LBBB type, RBBB type and mixed type between the two. QRS morphology and P’-R ’changes have nothing to do with the length of the previous period. ECG diagnosis: 1. sinus rhythm;