Myocardial Bridges and their Relationship to the Anterior Interventricular Branch of the Left Coronary Artery

Abstract

Myocardial bridges are more frequently found in the middle third of the anterior interventricular branch of the left coronary artery. The diameter of the anterior interventricular branch of the left coronary artery under the myocardial bridge may be smaller than after the bridge. Myocardial bridges may not provide protection against the formation of atherosclerotic plaque inside the anterior interventricular branch of the left coronary artery.

Myocardial bridge and coronary arteries: morphological study and clinical significance

“…In the present study, the mean length of MB was 24.9 ± 1.98 mm for all MB, 26.7 ± 2.9 mm over AIA, 6.5 ± 0.9 mm over DA and 5.13 ± 0.13 mm over PIA, however, the mean length of MB was 19.4 ± 10.4 mm in Colombians [5]. In agreement with the results of the present study, the mean length of MB was 30, 26, 25 mm and 22.7 ± 11.94 mm [19,20,28]. In 11% of the cases, the MB revealed an average length of 34.9-50 mm [28], whereas lower averages (13-17 mm) were reported [5,12].…”

“…However, a higher incidence of MB (64%, 56%, 55.6% and 52%) was reported in literature [6,12]. Moreover, a significance discrepancy was reported between cadaveric and angiographic studies regarding the incidence, frequency and prevalence of MB, where in cadaveric studies, the range of MB incidence was 5-86%, while in the angiographic studies, the occurrence of MB ranged from 0.5% to 33% [4,19,26]. The difference in the incidence and frequency of MB was supposed in part to be attributed to the sample size, morphological characters of MB, method of research, gender and ethnicity of the population selected [26].…”

“…In literature, a wide range of MB length was reported, where their length varied from 3.6 mm to more than 50 mm [19]. In the present study, the mean length of MB was 24.9 ± 1.98 mm for all MB, 26.7 ± 2.9 mm over AIA, 6.5 ± 0.9 mm over DA and 5.13 ± 0.13 mm over PIA, however, the mean length of MB was 19.4 ± 10.4 mm in Colombians [5].…”

Characterisation of myocardial bridges in pigs: a comparative anatomical analysis with the human heart

“…MB found in human hearts have been reported to be longer than those found in pigs, between a few millimetres and 50 mm, with an average range of 18-25 mm [2,16,23,24,28,29]. Reports on the thickness of MB in pigs have not included means, but ranges (0.8-4.7 mm) [1,22], thus making difficult to qualify our finding (1.13 mm) as similar or dissimilar to the findings of the studies described.…”

Descrição morfológica e implicações clínicas de pontes miocárdicas: um estudo anatômico em colombianos

“…MB incidence variability depends on recording method, gender, ethnicity and the nature of the study; in this sense a minor 0.5-12% angiographies present MB but in cadavers they are present in 5.4%-85.7% [9][10][11][12] . MB generally originate in the left coronary artery (LCA) trunk and branches, especially in the anterior interventricular artery (AIA) (12%-63%), circumflex artery (CA) (2.8%-6.7%) and its lateral branch (13%).…”