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上图取自一例31岁、女性、因心悸、胸闷两周就诊患者的心电图V_1导联,其中第二、三行为连续记录,第三行前四个心搏重复第二行末四个心搏,这幅心电图的诊断是什么?有何根据,应与哪些心律失常相鉴别?
The above picture is taken from a 31-year-old female with v-lead of electrocardiogram due to palpitations and chest tightness two weeks of treatment. The second and third rows recorded consecutively. In the third row, the first four beats repeated the last four beats in the second row, What is the basis for the diagnosis of this ECG? What arrhythmia should be differentiated?