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患者男性,40岁,临床诊断:心悸待查。同步12导联心电图均为1/2电压。本图的心电图诊断是什么?有何依据?应与哪些心律失常相鉴别?
Male patient, 40 years old, clinical diagnosis: palpitations pending investigation. Synchronous 12-lead ECG are 1/2 voltage. What is the basis of this ECG diagnosis? Which arrhythmia should be differentiated?