患者女,5岁。法洛氏四联症。术前心电图(图1A)显示:窦性心律,右心室肥大。术后第1d心电图(图1B)显示:I、aVL、V_6导联呈R型且宽钝,Ⅱ、Ⅲ、aVF呈rS型且S波宽钝,S_Ⅲ>S_Ⅱ,aVL呈qR型,电轴左偏-63°,P波与QRS波无关,各有其固定频率,心房率150次/min,心室率80次/min,呈窦性心动过速(ST)、加速性室性心动过速、三度房室 Female patient, 5 years old. Tetralogy of Fallot. Preoperative ECG (Figure 1A) shows: sinus rhythm, right ventricular hypertrophy. The postoperative 1st day electrocardiogram (Fig. 1B) showed that the leads of I, aVL and V_6 were R type and wide and blunt. The Ⅱ, Ⅲ and aVF showed rS type and the S wave was broad and blunted. S_Ⅲ> S_Ⅱ and aVL showed qR type. Left deviation of -63 °, P wave and QRS wave has nothing to do, each with its fixed frequency, atrial rate 150 beats / min, ventricular rate 80 beats / min, was sinus tachycardia (ST), accelerated ventricular tachycardia Third-degree atrioventricular