Abstract
Although some myocardial bridges can be asymptomatic, their presence often causes coronary disease either through direct compression of the "tunnel" segment or through stimulation and accelerated development of atherosclerosis in the segment proximally to the myocardial bridge. The studied material contained 30 human hearts received from the Department of Anatomy. The hearts were preserved 3 to 5 days in 10% formalin solution. Thereafter, the fatty tissue was removed and arterial blood vessels prepared by careful dissection with special reference to the presence of the myocardial bridges. Length and thickness of the bridges were measured by the precise electronic caliper. The angle between the myocardial bridge fibre axis and other axis of the crossed blood vessel was measured by a goniometer. The presence of the bridges was confirmed in 53.33% of the researched material, most frequently (43.33%) above the anterior interventricular branch. The mean length of the bridges was 14.64 ± 9.03 mm and the mean thickness was 1.23 ± 1.32 mm. Myocardial bridge fibres pass over the descending blood vessel at the angle of 10-90 degrees. The results obtained on a limited sample suggest that the muscular index of myocardial bridge is the highest for bridges located on RIA, but that the difference is not significant in relation to bridges located on other branches. The results obtained suggest that bridges located on other branches, not only those on RIA, could have a great contractive power and, consequently, a great compressive force, which would be exerted on the wall of a crossed blood vessel.
Highlights
Myocardial bridges represent an anomaly of coronary artery flow in which the branches flowing subepicardially descend into the myocardium more shallow or deeper, and after a shorter or longer intramyocardial flow, it reappears in the subepicardial tissue
The results obtained on a limited sample suggest that the muscular index of myocardial bridge is the highest for bridges located on RIA, but that the difference is not significant in relation to bridges located on other branches
The results obtained suggest that bridges located on other branches, those on RIA, could have a great contractive power and, a great compressive force, which would be exerted on the wall of a crossed blood vessel
Summary
Myocardial bridges represent an anomaly of coronary artery flow in which the branches flowing subepicardially descend into the myocardium more shallow or deeper, and after a shorter or longer intramyocardial flow, it reappears in the subepicardial tissue. Bundles of myocardial fibres, which in the form of small bridges, pass over the corresponding part of the coronary artery (“tunnel” segment), are marked as the myocardial bridge [ ]. It was Reymann who first detected myocardial bridges, as early as in [ ]. ALMIRA LUJINOVIĆ ET AL.: MORPHOLOGICAL ASPECTS OF MYOCARDIAL BRIDGES what induced us to this research with the aim to detect the frequency of myocardial bridges above certain branches of coronary arteries, to ascertain length and thickness of bridges and if there existed their interrelation. Our objective was to detect the angle at which the myocardial bridge fibres pass over the “tunnel” segment of the crossed blood vessel
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