Most lower extremity muscles had the strongest effect on frontal axis, sagittal axis takes the second place, the third is vertical axis.
下肢大多数肌肉对额状轴作用最大，矢状轴次之，垂直轴最小。
Conclusion QRS prolongation and frontal plane QRS axis deviation after contrast medium injection may be a marker of myocardial ischemia.
结论注射造影剂后QRS时间延长及QRS额面电轴的变化可能是急性心肌缺血的标志。
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.
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。
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