Most lower extremity muscles had the strongest effect on frontalaxis, 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。
2
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。
3
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.