A total of 523 consecutive and unselected patients were studied with both ECG for PTP-V, and UCG for left atrial size in order to evaluate PTF-V, in the diagnosis of left atrial enlargement.

• 523名连续的,无选择的病人既作心电图检查测量PTF-V_1,又进行超声心动图检查测量左房大小,以评价PTF-V_1诊断左房增大的价值。