患者男、76岁,因“腹痛、腹泻2天”入院,入院诊断为急性胃肠炎,既往有冠心病病史。入院常规心电图示(图1A):窦性心律,Ⅱ、aVF导联QRS波呈Qrs型,Ⅲ导联呈QS型,V2、V3、V4导联QRS起始部似有δ波,V1～V6导联R/S>1。患者无心悸胸痛等症状,急查心肌酶谱正常。入院3h后复查心电图(图1B)Ⅱ、aVF导联QRS波呈RS型,Ⅲ导联呈rS,V1导联 Male patient, 76 years old, due to “abdominal pain, diarrhea 2 days ” admission, admitted to hospital for diagnosis of acute gastroenteritis, previous history of coronary heart disease. Conventional electrocardiogram (Figure 1A): sinus rhythm, Ⅱ, aVF lead QRS wave was Qrs type, Ⅲ lead was QS type, V2, V3, V4 lead QRS beginning like a δ wave, V1 ~ V6 Lead R / S> 1. No palpitations in patients with chest pain and other symptoms, acute myocardial enzymes normal. ECG 3h after admission (Figure 1B) Ⅱ, aVF lead QRS wave was RS type, Ⅲ lead was rS, V1 lead