心电图半定量估测左房内径的价值

A study of semiquantitative estimation of left atrial size by means of electrocardiogram

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 order to study the value of P wave duration(PWD)and P wave in lead V1(Ptfv1) in estimation of left atrial(LA)size and reexamine the sensitivity and specificity of PWD and Ptfv1 for diagnosis of LA enlargement.We examined the two-dimensional electocardiogram and electrocardiogram in 119 patients with heart disease.The results showed that the sensitivity and specificity of PWD≥110 ms were 56.90% and 59.26%,whereas those of the Ptfv1≥-30 ms.mm were 69.23% and 81.48%,respectively.The PWD progressively lengthened and the magnitude of Ptfv1 gradually increased as LAsize increased.This study indicates that the PWD used for diagnosis of LA enlargement is less effective than the Ptfv1.The Ptfv1 can be used not only for identification of LA enlargement,but also for estimation of the degree of LA enlargement.