方法观察34例经冠状动脉造影确诊为左冠状动脉狭窄而右冠状动脉无病变的冠心病患者，注射造影剂前后QRS时间和额面电轴的变化。
Methods QRS duration and frontal plane QRS axis were measured before and after injection of contrast medium in 34 patients with left coronary artery disease identified by coronary angiography.
结果冠状动脉狭窄发生率依次为前降支、右冠、回旋支及其他分支。
Results the stenosis of coronary artery occurred in left anterior descending most frequently, right coronary artery secondly, left circumflex thirdly and other branches.
冠状动脉各支在70％相位窗上显示率最高，LAD、LCA、RCA分别为96％、92％、86％，右冠状动脉在40％相位窗上显示率也较高，为74％；
The rate of demonstration of every artery (LAD96% LCA92% RCA86% ) was highest in 70% reconstruction window and relatively higher in RCA (74% ) in 40% reconstruction window .
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