Araoye M A
Department of Medicine, University of Ilorin, Nigeria.
Afr J Med Med Sci. 1995 Sep;24(3):283-8.
Spatial magnitudes of instantaneous QRS and ST-T vectors were studied in 664 (333 male: 331 female) normal Nigerians aged 15 to 90 (Mean: 39.1 +/- 16.7) years. Measurements were made manually using 8 divisions (octets) per QRS or ST-T waves. Not only the maximum amplitude but also several identical points on the QRS, J-point and St-T curves were higher in males than females. The R wave, J-point and ST-T vectors were oriented leftwards, inferiorly and posteriorly. The ST-segments were not iso-electric. The rates of ventricular depolarization (dV/dt) varied from one octet to another with maximum dV/dt occurring during the third octet. Ventricular repolarization was slower with peak rates during the fifth octet. It is concluded that this technique is simple, informative and practicable at bedside; but further studies are required to explore its diagnostic usefulness in patients with heart disease.
对664名（333名男性，331名女性）年龄在15至90岁（平均39.1±16.7岁）的尼日利亚正常人群的瞬时QRS和ST-T向量的空间大小进行了研究。使用每个QRS或ST-T波8个分区（八位字节）手动进行测量。不仅男性的最大振幅高于女性，QRS、J点和St-T曲线上的几个相同点也是男性高于女性。R波、J点和ST-T向量向左、向下和向后定向。ST段并非等电位。心室去极化速率（dV/dt）在不同八位字节之间变化，最大dV/dt出现在第三个八位字节期间。心室复极化较慢，峰值速率出现在第五个八位字节期间。结论是，该技术简单、信息丰富且在床边可行；但需要进一步研究以探索其在心脏病患者中的诊断效用。
