Fact-sheet: Myocardial bridge


Updated on 05/24/2024 at 9:46 AM

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Definition

A myocardial bridge is the segmental overlap of a coronary artery by a myocardial band along its normal epicardial course.

Clinical features

In the vast majority of cases: asymptomatic and an incidental finding, particularly on coronary CT angiography.

Rarely:

  • Systolic compression leading to myocardial ischemic symptoms: resting angina, acute coronary syndrome, notably with anterior infarctions given the preferential location on the LAD
  • Rhythm and conduction disorders
  • Syncope
  • Sudden death

CT

On coronary CT angiography, the following should be specified:

  • the arterial segment involved,
  • the length of the bridge: long myocardial bridge if >= 25 mm
  • and the depth, i.e., the thickness of myocardium between the most superficial arterial wall and the epicardial fat.
    Superficial myocardial bridge if < 2.5 mm.
  • Deep myocardial bridge if >= 2.5 mm.

Schéma coroscanner pont myocardique