张某.男性,52岁,临床诊断:冠心病?心电图见附图:选择AVF及V导联。本例心电图特点:①全图为窦性心律,68次/分,P—R期间逐渐延长由0.16秒～0.46秒,每当延长到0.46秒时,其后出现较长的P—P间歇,且长P—P小于短P—P的两倍。②P—R间期的最大增量发生在最后一次窦性下传的心搏,而不是在第二次窦性下传的搏动。③漏搏前的P—R间期有时接 Zhang, male, 52 years old, clinical diagnosis: coronary heart disease? ECG see attached figure: Select AVF and V lead. The characteristics of the ECG in this case: ① The whole figure is sinus rhythm, 68 beats / min, P-R gradually extended from 0.16 seconds to 0.46 seconds, each time extended to 0.46 seconds, followed by a longer P-P intermittent, And the long P-P is less than twice the short P-P. ② The maximum increment of P-R interval occurs at the last sinus beats, not at the second sinus beats. ③ missed before the P-R pulse interval sometimes take