Evaluation of coronary myocardial bridge by electrocardiogram and treadmill exercise test

Abstract

Objective To analyze the electrocardiogram and treadmill exercise performance in patients with coronary artery myocardial bridge. Methods 176 patients with myocardial bridging diagnosed by coronary angiography were selected in the study.The performance of myocardial bridge electrocardiogram and treadmill exercise of different depth and stenosis was observed. Results Deep in myocardial bridge ischemic ST segment and T wave changes were significantly higher than superficial type(χ2=11.02, P<0.01). Systolic myocardial bridge Ⅲ grade stenosis of ischemic ST segment and T wave changes were significantly higher than gradeⅠand gradeⅡ(χ2=12.78, P<0.01; χ2=24.45, P<0.01). The positive rate of myocardial bridge deep in the treadmill exercise test was significantly higher than the superficial type.Myocardial bridge Ⅲ grade systolic stenosis, treadmill exercise test positive rate was significantly higher than gradeⅠand gradeⅡ(χ2=9.23, P<0.05; χ2=6.76, P<0.01). Conclusion Patients with myocardial bridge have various changes in the electrocardiogram and treadmill exercise, changes in deep in the type and degree of stenosis Ⅲ grade systolic are obvious. Key words: Myocardial bridge; Electrocardiogram; Treadmill exercise