Cinical analysis of 138 cases of coronary myocardial bridge

Objective To assess the prevalence of coronary myocardial bridge in patients underwent diagnostic angiography and its clinical features.Methods and Results Among 3356coronary angiograms performed in the department of the cardiology,Suining central hospital,138 patients had myocardial bridge over the left anterior descending arteries.The total prevalence of myocardial bridges was 4.11%.Among these patients,26 patients had coronary artery disease,6 patients had valvular heart disease and 6 patients had cardiomyopathy.100 patients had isolated myocardial bridges.Among the patients with isolated myocardial bridge,50 patients had70% systolic narrowing of coronary artery 34 patients had 50%～70%,16 patients had50%.Among 100 patients with isolated myocardial bridges,50 patients had chest pain and 36 patients had ST-T abnormality in electrocardiogram.26 patients were showed myocardial hypertrophy by left ventriculogram or echocardiogrm.Conclusion Myocardial bridge could be found by Coronary angiography.The prevalence of coronary myocardial bridging in the studied coronary angiographic popoulation was 4.11%.Myocardial bridge could be responsible for symptoms of myocardial ischemia,ST-T abnormality in electrocardiogram and positive result in exercise testing.The symptoms were associated with the degree of narrowing of the left anterior descending artery during systole.