上图取自一例男性、64岁、冠状动脉硬化性心脏病患者的心电图II导联,上下两行为连续记录。这帧心电图的诊断是什么?有何根据?应该与哪些心律失常相鉴别? The above picture is taken from an electrocardiogram II lead of a male, 64-year-old patient with coronary artery disease. The upper and lower two rows are recorded continuously. What is the basis for the diagnosis of this ECG? What arrhythmia should be differentiated?