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The prevalence of myocardial bridging on multidetector computed tomography and its relation to coronary plaques

Ravindran Rajendran1, Madhav Hegde2

  • 1Trichy SRM Medical College Hospital & Research Centre, Irungalur, Trichy, Sri Jayadeva Institute of Cardiovascular Sciences and Research, Bangalore, India.

Polish Journal of Radiology
|February 22, 2020
PubMed

Insights

Myocardial bridging, a condition where heart muscle covers an artery, was found in 10% of patients. Contrary to the hypothesis, the segment near myocardial bridges showed fewer plaques, with a lower length-to-depth ratio in those with plaques.

Area of Science:

  • Cardiovascular research
  • Medical imaging analysis
  • Coronary artery disease epidemiology

Background:

  • Myocardial bridging is a congenital anomaly where a segment of a coronary artery travels through the heart muscle.
  • The association between myocardial bridging and coronary atherosclerosis remains a subject of investigation.

Purpose of the Study:

  • To investigate the prevalence of myocardial bridging across different ethnic groups.
  • To determine if the segment proximal to myocardial bridging is more susceptible to atherosclerotic plaque formation.

Main Methods:

  • Retrospective analysis of 4500 patients undergoing CT coronary angiography.
  • Comparison of clinical data and coronary angiography findings between patients with and without myocardial bridging.
  • Calculation of the length-to-depth ratio (RA-MA ratio) for bridged segments.

Main Results:

  • The prevalence of myocardial bridging was 10%, most commonly in the mid left anterior descending artery (LAD).
  • The prevalence of atherosclerotic plaques proximal to the bridged segment (37.8%) was lower than in patients without myocardial bridging (48.7%).
  • A significantly lower RA-MA ratio was observed in patients with proximal atherosclerotic plaques compared to those without.

Conclusions:

  • Myocardial bridging prevalence in the study population was 10%, with the mid LAD being the most affected segment.
  • The study did not support the hypothesis that the segment proximal to myocardial bridging is more prone to plaque formation.
  • Coronary plaque prevalence and distribution in the LAD were similar in patients with and without myocardial bridging.
Abstract

Keywords:
CADCT coronary angiogrambridging ratiocoronary plaqueepidemiologymyocardial bridging

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