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上图为一男性,72岁,临床诊断冠心病,患者的心电图 V_1导联连续记录。该图的诊断是什么?请借助梯形图探讨其发生机理。
The picture shows a male, 72 years old, clinically diagnosed coronary heart disease, patients with continuous recording of electrocardiogram V_1 lead. What is the diagnosis of the figure? Please use the ladder diagram to explore its mechanism.