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临床上以心电图 P 波时间增宽诊断左房肥大,因操作方便,至今仍不失其适用价值,但敏感性较低。近年来,由于心电向量理论日趋完善,促使心电图有所进展。临床工作者很重视水平面电轴 V_1导联 P 波终末向量(PTF)的变化,发现在左房异常的心电图中,有时肢体导联 P 波正常而 PTF v_1已有
Clinically, the diagnosis of left atrial hypertrophy due to P wave of ECG is widened. Due to the convenience of operation, its applicable value has not been lost yet, but the sensitivity is low. In recent years, due to the increasingly perfect ECG vector theory, prompting the progress of ECG. Clinicians attach great importance to the change of the P-wave terminal (PTF) of the horizontal axis V_1 lead, and found that in the ECG with left atrial abnormality, the P wave of the limb lead is normal and the PTF v_1 has been