Myocardial infarction in the distribution of a patent anomalous left circumflex coronary artery
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Anomalous origin of the left circumflex coronary artery can cause myocardial infarction, even without atherosclerosis. This case highlights a nonatherosclerotic cause in a 45-year-old man after physical exertion.
Area of Science:
- Cardiology
- Congenital Heart Disease
- Vascular Biology
Background:
- Anomalous origin of the left circumflex coronary artery (ALCCA) is the most common congenital coronary anomaly.
- Myocardial infarction (MI) can occur in the territory of an anomalous coronary artery, particularly when atherosclerotic.
- Nonatherosclerotic causes of MI in ALCCA are less understood.
Observation:
- A 45-year-old man presented with MI following strenuous physical activity.
- Coronary angiography revealed nonatherosclerotic coronary arteries.
- A unique finding was the ALCCA originating from the right sinus of Valsalva.
Findings:
- The patient experienced MI despite having no atherosclerotic coronary artery disease.
- The ALCCA's anomalous origin from the right sinus of Valsalva was identified as a potential contributing factor.
- This suggests mechanical compression or altered flow dynamics in the anomalous vessel.
Implications:
- Congenital coronary anomalies, like ALCCA, can precipitate MI even in the absence of atherosclerosis.
- Strenuous physical exertion may unmask or exacerbate risks associated with ALCCA.
- Further research is needed to understand the pathophysiology and management of nonatherosclerotic MI in ALCCA.
Abstract:
Anomalous origin of the left circumflex coronary artery is the most common congenital coronary artery anomaly. Myocardial infarction has been seen in the distribution of this anomalous vessel. This has been noted most typically when the vessel is atherosclerotic. Sudden death and myocardial infarction, however, also have been seen in a case without atherosclerotic involvement. This is a case report of a 45-year-old man who suffered a myocardial infarction after strenuous and sustained physical effort and who was found to have nonatherosclerotic coronary arteries with an anomalous left circumflex coronary artery arising from the right sinus of Valsalva.