Myocardial bridging is one type of anatomic variations of coronary arteries and may cause ischemic manifestation or even sudden deaths in young people; this anomaly is still a challenge for cardiac interventionists and surgeons. This study aimed at identifying the mean frequency and sites of myocardial bridging and at analyzing its clinical significance Research methodology: This retrospective and anterospective descriptive research was carried out using 64-MSCT films of 1108 patients taken from June 2008 to July 2009. These patients had clear images of coronary arteries; in case of stenosis, the lesions less than 50 percent of the diameter of the arteries were chosen for this research. Results: 14.2 percent of patients had anatomic variations in coronary arteries, 10.65 percent of which were myocardial bridging; all of these myocardial bridging instances were present somewhere on the route of anterior inter-ventricular arteries (P-LAD 0,59 percent, M-LAD 75,42 percent, D-LAD 19,49 percent). The average length of the bridges was 16,93 + or - 7,95 mm, while the depth was 2,06 + or - 1,06. 37.5 percent to 67.8 percent of patients were detected abnormal coronary arteries without, clinical symptoms. Conclusion: 64-MSCT can be used to detect early and exactly the form and anatomic variations of coronary arteries. This is very helpful in screening coronary artery diseases.
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