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本研究通过对１１９名心脏病患者同步检查体在心电图及二维超声心动图，探讨Ｐ波时间及Ｐｔｆｖ１估测左房内径的价值及两者诊断左房扩大的敏感性与特异性。结果表明：Ｐ波时间≥１１０ｍｓ诊断左房扩大的敏感性为５６．９６％，特异性为５９．２６％，Ｐｔｆｖ１≥－３０ｍｓ·ｍｍ诊断左房扩大的敏感性为６９．２３％，特异性为８１．４８％。随着左房内径的增大，Ｐ波时间逐渐延长，Ｐｔｆｖ１逐渐增大。经分析在明采用Ｐ波时间诊断左房扩大不如Ｐｔｆｖ１可靠，Ｐｔｆｖ１不仅可以诊断左房扩大，而且可以半定量估测左房扩大的程度。
In this study, 119 patients with heart disease synchronous examination in the electrocardiogram and two-dimensional echocardiography, P wave time and Ptfv1 estimate the value of left atrial diameter and the diagnosis of both left atrial enlargement sensitivity and specificity. The results showed that the sensitivity and specificity of P wave time ≥110 ms in diagnosing left atrium enlargement were 56.96% and 59.26%, respectively. The sensitivity of Ptfv1≥-30 ms · mm in diagnosing left atrium enlargement was 69.23% 81.48%. With the increase of the diameter of the left atrium, the P wave time gradually extended and Ptfv1 gradually increased. Analysis of the use of P wave time in the diagnosis of left atrial enlargement less reliable than Ptfv1, Ptfv1 can not only diagnose the left atrial enlargement, and semi-quantitative assessment of left atrial enlargement.