Myocardial bridging is anatomically defined as the muscle overlying the intramural segment of a major epicardial coronary artery, mainly the mid-portion of the left anterior descending (LAD) coronary artery. Myocardial bridging is present when a segment of a major epicardial coronary artery, the ‘tunnelled artery’, runs intramural through the myocardium. Myocardial bridging has been associated with angina, arrhythmia, depressed left ventricular function, myocardial stunning, and early death after cardiac transplantation, and sudden death. Seventy formalin fixed cadaveric hearts specimens irrespective of age, sex, and race were collected and serially numbered from 1 to 78. The left coronary artery (LCA) was dissected out carefully avoiding damage to the small branches and the number of terminal branches of the main trunk at subepicardial level were noted. The location, type, number and direction of myocardial bridges were noted. With the help of digital calipers, the length of myocardial bridges were measured, noted and photographs were taken. Out of the total seventy eight hearts dissected, sixty eight showed myocardial bridge in at least one coronary artery or in one of its significant branches. The overall prevalence was 87.17%. The maximum length of myocardial bridge was 5.1 cm. Knowledge on morphology and morphometric details of myocardial bridges facilitate cardiologists in diagnosis, planning therapeutic strategies and prognostic predictions.
KEY WORDS: Coronary dominance, Left anterior descending (LAD) artery, Myocardial bridge (MB), Tunneled artery, Acute coronary syndrome.