Methods Artificially replay the Dynamic electrocardiogram of 45 cases of PAf,record the time of atrial fibrillation(Af),and identify the site of atrial premature beat(APB).

• 方法对45例PAf患者的动态心电图人工回放,记录心房颤动(Af)发作次数、发作时间、发作前三个心房周期、联律间期,并根据触发Af的房性期前收缩的P波形态确定房性期前收缩部位。