Myocardial bridges: morphological and functional aspects.
TL;DR: The superficial type of myocardial bridge does not seem to constrict the artery during systole but the deep muscle bridges, by virtue of their relation with the left anterior descending coronary artery, could twist the vessel and thus compromise its diastolic flow and thus result in ischaemia.
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Abstract: OBJECTIVE--To assess the arrangement of myocardial bridges. DESIGN--A necropsy study of 90 consecutive hearts (56 male, 34 female). RESULTS--Myocardial bridges, either single or multiple, were seen in 50 (55.6%) of the 90 hearts. The left anterior descending artery was the most commonly affected artery. Thirty five of the 50 hearts which contained in total 41 muscle bridges were dissected further with a magnifying glass. Two different types of muscle bridges could be identified. Thirty one of these 41 myocardial bridges were superficial, crossing the artery transversely towards the apex of the heart at an acute angle or perpendicularly. The remaining 10 myocardial bridges crossed the left anterior descending coronary artery and surrounded it by a muscle bundle that arose from the right ventricular apical trabeculae and crossed the artery transversely, obliquely, or helically before terminating in the interventricular septum. CONCLUSIONS--The superficial type of myocardial bridge does not seem to constrict the artery during systole but the deep muscle bridges, by virtue of their relation with the left anterior descending coronary artery, could twist the vessel and thus compromise its diastolic flow. This may result in ischaemia.
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Citations
Myocardial bridge and beta blockers: effect on left ventricular strain parameters
TL;DR: The negative chronotropic effect of beta-blocker medication in individuals with myocardial bridging identified by coronary angiography has been found to have a beneficial effect on left ventricular global longitudinal strain (LV Gls) as measured by echocardiography as discussed by the authors .
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Merkezimizde Miyokardiyal Köprüleşmenin Anjiografik Sıklığı
Muhammed Oylumlu,Adnan Dogan,Mehmet Ali Astarcıoğlu,Murat Karamanlıoğlu,Mehmet Özgeyik,Celal Kilit,Taner Şen,Basri Amasyali +7 more
TL;DR: The prevalence of Myocardial Bridge was found similar to the values presented in various angiography studies in the literature, but was found significantly more common in males and was detected most frequently in the LAD artery.
Myocardial bridging in all major epicardial vessels.
TL;DR: A 40-year-old man, nonsmoker, presented with chronic stable angina for the past 1 year and the electrocardiogram and echocardiography revealed severe concentric left ventricular hypertrophy suggestive of hypertrophic cardiomyopathy.
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TL;DR: There are a wide range of variations in the course of the coronary arteries, and common pathways for these anomalies of origin are interarterial, prepulmonary, retro- or circum-aortic, trans-septal, and retrocardiac.
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