Coronary dominance pattern in Myocardial bridged hearts

Posterior interventricular artery (PIA) present in the posterior interventricular groove over the inferior surface of the heart. Human hearts consist of either  Right coronary predominance or Left coronary predominance. Left coronary predominant people are more prone to get ischemic heart diseases. In left coronary predominance entire left ventricle except a part of the right ventricle adjoining anterior interventricular groove supplied by the left main coronary artery. Left coronary dominance has a poor prognosis in acute coronary syndrome when compared with the right coronary predominance. Myocardial bridging may be benign or malignant. So myocardial bridging with left coronary dominance may be a risk factor to the ischemic heart disease. The aim of the present study is to find out the coronary dominance pattern in myocardial bridged hearts in cadavers. Ninety cadaveric hearts were procured from the Department of Anatomy, IMS & SUM Hospital Bhubaneswar. After a simple dissecting procedure, myocardial bridges and coronary dominance patterns were observed. Myocardial bridging was present over the left anterior interventricular artery in 51(56.7%) hearts. Out of 51 myocardial bridged hearts, right coronary predominance is present in 45 (88.24%) hearts and left coronary predominance present in 6(11.76%) hearts.  Along with the left dominance, if myocardial bridge present over the left epicardial coronary artery, there may be an increased frequency of myocardial ischemia.