Abnormal coronary artery course Myocardial bridging 2017-05-14T19:08:29Z A congenital variant of a coronary artery in which a portion of an epicardial coronary artery (most frequently the middle segment of the left anterior descending artery) takes an intramuscular course. Intramyocardial coronary artery course Myocardial bridging, in which a tunneled segment of the artery under the bridge of overlying myocardium frequently results in vessel compression during systole. While frequently asymptomatic, this condition in many cases may be responsible for adverse complications including angina, myocardial ischemia, acute coronary syndromes, left ventricular dysfunction, arrhythmias, and even sudden cardiac death.