Chirife R, Feitosa G S, Frankl W S
Br Heart J. 1975 Dec;37(12):1281-5. doi: 10.1136/hrt.37.12.1281.
The validity of various electrocardiographic P wave measurements was tested in 48 patients by comparing them to left atrial dimensions determined by echocardiography (echo), a proved method of left atrial size estimation. Of all the measurements considered, only the width of the P wave (PW), the P terminal force in lead V1 (PV1), and the PW/PR segment ratio (PW/PR) showed statistically significant correlations with left atrial size measurements by echo, with r values of 0-746, 0-491, and 0-479, respectively. The results indicated that P widths in excess of 105 ms were present in all the patients who had left atria equal to or greater than 3-8 cm by echo and in 11 per cent of patients without atrial enlargement (false positives), and that when measurements were less than 105 ms left atrial enlargement was unlikely.
通过将各种心电图P波测量值与经超声心动图（echo）测定的左心房尺寸进行比较，对48例患者进行了各种心电图P波测量的有效性测试，超声心动图是一种已证实的左心房大小估计方法。在所有考虑的测量值中，只有P波宽度（PW）、V1导联的P波终末电势（PV1）以及PW/PR段比值（PW/PR）与超声心动图测量的左心房大小显示出统计学上的显著相关性，r值分别为0.746、0.491和0.479。结果表明，所有经超声心动图显示左心房等于或大于3.8 cm的患者以及11%无心房扩大的患者（假阳性）中均存在P波宽度超过105 ms的情况，而当测量值小于105 ms时，左心房扩大的可能性不大。
