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[Symptomatic myocardial bridges. Apropos of 6 cases]
1Centre de cardiologie clinique et interventionnelle, CHU, hôpital du Bocage, Dijon.
Insights
Myocardial bridges, often seen as benign variations, can cause serious heart issues like myocardial infarction. This occurs through mechanisms such as coronary spasm and thrombosis at the bridge site.
Area of Science:
- Cardiology
- Anatomical Variations
Background:
- Myocardial bridge is a congenital anomaly where a segment of coronary artery tunneled through myocardium.
- Its role in causing myocardial ischemia is debated, with unclear pathophysiological mechanisms.
Observation:
- The study presents 6 cases of myocardial bridge associated with myocardial infarction and unstable angina.
- Patients were typically young males, with the left anterior descending artery most frequently affected.
Findings:
- Myocardial bridges can precipitate ischemic events through coronary spasm, tachycardia, and thrombosis.
- Diagnosis relies on coronary angiography, showing systolic diameter reduction, potentially enhanced by pharmacologic stress tests.
Implications:
- Highlights the potential pathogenicity of myocardial bridges beyond simple anatomical variation.
- Suggests further investigation into the mechanisms linking myocardial bridges to ischemic heart disease.
Abstract:
Myocardial bridge is often considered to be a simple anatomical variation often observed during coronary angiography. The responsibility of this condition for myocardial ischaemia is however uncommon and the physiopathological mechanisms are not well understood. The authors report 6 cases of myocardial bridge associated with myocardial infarction of unstable angina. The main features of this condition are discussed with respect to a review of the literature. Patients are usually young and male; the left anterior descending artery is the most commonly affected vessel: factors triggering ischaemia are discussed: coronary spasm, tachycardia and thrombosis at the site of the myocardial bridge. The diagnosis can only be made by coronary angiography showing reduction of the systolic diameter of the artery which may be accentuated by certain pharmacological tests such as injection of glyceryl trinitrate as used in the series.