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上图为1例男性、7岁、先天性心脏病室缺、动脉导管未闭患者的心电图Ⅱ导联记录。本图心电图诊断是什么?有何依据?应与哪些心律失常相鉴别?
The picture shows a male, 7 years old, congenital heart disease, patent ductus arteriosus in patients with ECG Ⅱ lead record. What is the basis of this electrocardiogram diagnosis? Which arrhythmias should be differentiated?