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左房扩大在心电图上产生一个宽(0.12秒或更宽)而双峰(峰间距大于0.04秒)p 波·宽 p 波也可由心房内传导延迟引起,因此这种异常并非左房扩大所特有。异常的 V_1导联 P 波终末电势(简称PTF-V_1)系指 V_1导联阴性 P 波的深度
Left atrial enlargement produces a broad (0.12 second or wider) bimodal peak on the electrocardiogram (peak spacing greater than 0.04 seconds). The p-wave width p-wave can also be caused by an atrial conduction delay and is therefore not unique to left atrial enlargement . The abnormal V_1 lead P-wave terminal potential (referred to as PTF-V_1) refers to V_1 lead negative P-wave depth