Abstract
Recent clinical reports have indicated that myocardial bridge and mural coronary artery complex (MB-MCA) might cause major adverse cardiac events. 256-slice CT angiography (256-slice CTA) is a newly developed CT system with faster scanning and lower radiation dose compared with other CT systems. The objective of this study is to evaluate the morphological features of MB-MCA and determine its changes from diastole to systole phase using 256-slice CTA. The imaging data of 2462 patients were collected retrospectively. Two independent radiologists reviewed the collected images and the diagnosis of MB-MCA was confirmed when consistency was obtained. The length, diameter, and thickness of MB-MCA in diastole and systole phases were recorded, and changes of MB-MCA were calculated. Our results showed that among the 2462 patients examined, 336 have one or multiple MB-MCA (13.6%). Out of 389 MB-MCA segments, 235 sites were located in LAD2 (60.41%). The average diameter change of MCA in LAD2 from systole phase to diastole phase was 1.1 ± 0.4 mm, and 34.9% of MCA have more than 50% diameter stenosis in systole phase. This study suggested that 256-slice CTA multiple-phase reconstruction technique is a reliable method to determine the changes of MB-MCA from diastole to systole phase.
Highlights
Mural coronary artery (MCA) is defined as the intramural segment of a coronary artery that normally courses epicardially. This condition is accompanied by a bunch of cardiac muscle fibers that passes over those vessels like a bridge and was called myocardial bridge and mural coronary artery (MB-MCA)
multidetector computed tomography (MDCT) revealed that MCA shifted into the myocardium
Through quantity measurement of MB-MCA that located in the middle segment of left anterior descending artery (LAD), we found that Δthickness of MB, Δdiameter and Δlength of MCA between ED and ES phase were statistically significant (P < 0.05, Table 3)
Summary
Mural coronary artery (MCA) is defined as the intramural segment of a coronary artery that normally courses epicardially This condition is accompanied by a bunch of cardiac muscle fibers that passes over those vessels like a bridge and was called myocardial bridge and mural coronary artery (MB-MCA). It was recognized at autopsy by Reyman in 1737, and its angiographic characteristics were first described by Portmann and Iwig in 1960 [1, 2]. The early detection of MB-MCA will help to make clinical intervention in time
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