Objective To study the relationship between Noble grade and distribution of myocardial
bridge and
atherosclerosis.
Methods The clinical data of 192
patients with myocardial
bridge diagnosed by
coronary artery angiography were retrospectively analysed.The clinical symptoms,electrocardiographic and echocardiographic findings were analysed to explore the relationship between Noble grade and distribution of myocardial
bridge and
atherosclerosis,and the outcomes of medical
treatment were also investigated. Results The positive rate of myocardial
bridge detected by
coronary artery angiography was 10.2%,which was usually observed in the middle part of left anterior descending
coronary artery.All the
patients with grade 3 of Noble grade experienced
chest pain or palpitation,43.8% had ischemic ST-T changes on
electrocardiogram,and 37.5% had abnormal segmental ventricular wall on
echocardiography.However,
patients with Noble grade 1 and 2 did not have ischemic ST-T changes on
electrocardiogram or abnormal segmental ventricular wall on
echocardiography.The
prevalence of
atherosclerosis in proximal
coronary artery of myocardial
bridge was significantly higher than those of mural
coronary artery and distal
coronary artery(P