Clinical Study of Myocardial Bridge

Background and ObjectivesMyocardial bridge is a congenital coronary anomaly that causes myocardial ischemia by a milking effect.The general study of myocardial bridge is weak, therefore we retrospectively examined clinical records of cases of myocardial bridge.Materials and MethodThis study included 36 bridge cases out of 1048 patients who underwent coronary angiography due to chest pain from Jan. 1993 to Jul. 1998.Angiographic film, medical records and telephone interviews were reviewed retrospectively.The total followup duration was a mean 27 months (1 month to 62 months).ResultsThe incidence of myo-cardial bridge diagnosed by angiography was 3.4%.Angiography showed normal tissue in 32 cases, single-vessel disease in 3 cases and two-vessel disease in one patient.The mean reference diameter was 2.970.36mm, bridge diameter was 2.750.33mm in diastole, 1.120.47mm in systole.The myocardial bridge length was 12.50 7.44 mm, and the mean % diameter stenosis was 59.2617.7%.Myocardial bridge location was 80.6% in mid LAD, 13.9% in mid & distal LAD and 5.5% in distal LAD.There was no statistically significant correlation of the severity of myocardial bridge with sex, risk factor for coronary heart disease, resting electrocardigraphy, treadmill test, diameter and angulation of coronary artery, or clinical symptom.However, the severity of myocardial bridge was correlated with bridge length (r0.5033).ConclusionThe clinical outcomes of patients were relatively good during the mean follow up period of 27 months.Myocardial bridge was more severe in younger patients and those with a longer bridge length.( ( ( (Korean Circulation J 2001 ; 31( ( ( (3) ) ) ) : 311-316) ) ) ) KEY WORDSMyocardial bridgeCoronary angiography. (myocardial bridging) Intralumi-nal coronary artery, Mural coronary artery, Coronary overbridging , .Reyman 1937 0.512% 5.4 85.7% . Milking effect 2000 11 20