415 DOES MYOCARDIAL BRIDGING TRIGGER MYOCARDIAL ISCHEMIA?

Abstract Background Myocardial bridging (MB) is a congenital epicardial coronary abnormality, in which segment of the artery runs through myocardium, determining dynamic stenosis during systole. Whether MB can be responsible by itself for myocardial ischemia remains unclear. Thus, we aimed to evaluate whether related cause signs and symptoms ischemia. Methods We enrolled 41 consecutive patients who underwent angiography because chest pain suspected ischemic heart disease were found have absence any significant flow-limiting other cardiac disease. A group 14 also disease, but free or abnormality (including MB) showed negative results at exercise stress test (EST) served as controls. All maximal treadmill EST according standard Bruce protocol. complete echocardiographic examination was performed rest peak exercise. Results Baseline parameters comparable between groups, whereas diastolic blood pressure (pDBP) slightly higher (p=0.044). No clinically differences baseline parameters, although E wave deceleration time (DcT) longer (p=0.038) global longitudinal strain (GLS) (p=0.05) group. During exercise, left ventricular ejection fraction (LVEF) improved significantly both groups (p<0.001), without difference 2 groups. GLS did not show changes with Moreover, among patients, no those positive vs. EST. Conclusions failed demonstrate impairment LV systolic function MB. dysfunction that developed ECG EST, compared evidence our data question about ability trigger clinical practice.