This ECG was recorded during a routine checkup of a 77-year-old man who had a heart attack 8 months earlier. He was in the countryside when he felt constrictive chest pain lasting ≈2 hours but was not hospitalized until 20 hours later. A coronary angiogram was performed the following day. Based on ECG demonstrated in Figure 1, where is the culprit lesion? Where was the myocardial infarction (MI) located? Figure 1. The 12-lead ECG (see text for description). Please turn the page to read the diagnosis. This ECG shows sinus rhythm with left-axis deviation in the frontal plane (left anterior hemiblock) with notches in the S wave, a broad R>S in V1, and Rs with progressively decreased voltage until V6. In frontal plane leads, the voltage was low in all leads, and the T wave was flat in I leads and left …

中文翻译：

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慢性心肌梗塞

在例行检查八个月前心脏病发作的77岁男子的常规检查中记录了此心电图。当他感觉到持续约2小时的缩窄性胸痛，但在农村时才住院，直到20小时后才住院。第二天进行冠状动脉造影。根据图1所示的心电图，罪魁祸首在哪里？心肌梗塞（MI）在哪里？图1. 12导联心电图（请参见文字说明）。请翻页阅读诊断。此心电图显示窦性心律，其前轴左轴偏斜（左前半块），S波中有凹口，V1中宽R> S，而Rs电压逐渐降低直至V6。在额线引线中，所有引线的电压均低，I引线中的T波平坦，而左...