Coronary arterial fistula

Coronary arterial fistula (also known as coronary artery fistula, coronary arteriovenous fistula, or coronary cameral fistula) is a rare congenital or acquired cardiac anomaly in which an abnormal communication exists between one or more coronary arteries and a cardiac chamber, great vessel, or other vascular structure, bypassing the normal myocardial capillary bed. This abnormal connection creates a shunt that diverts blood away from the myocardial circulation. The condition primarily affects the cardiovascular system. Most coronary arterial fistulas originate from the right coronary artery and drain into the right side of the heart, particularly the right ventricle, right atrium, or pulmonary artery. Many patients with small fistulas remain asymptomatic and the condition may be discovered incidentally during cardiac imaging or auscultation of a continuous heart murmur. However, larger fistulas can lead to significant hemodynamic consequences including congestive heart failure, myocardial ischemia (due to coronary steal phenomenon), angina pectoris, arrhythmias, infective endocarditis, pulmonary hypertension, and rarely, fistula rupture. Symptoms may develop gradually and can present at any age, though larger fistulas tend to become symptomatic earlier in life. In neonates and infants with large fistulas, heart failure may be the presenting feature. Treatment depends on the size and hemodynamic significance of the fistula. Small, asymptomatic fistulas may be managed conservatively with regular monitoring. Symptomatic or hemodynamically significant fistulas typically require closure, which can be achieved through transcatheter embolization (using coils, vascular plugs, or other occlusion devices) or surgical ligation. Transcatheter closure has become the preferred approach for many patients due to its less invasive nature. Surgical repair is generally reserved for complex fistulas, very large fistulas, or cases where transcatheter approaches are not feasible. Long-term outcomes after successful closure are generally favorable, though follow-up is recommended to monitor for recurrence or residual shunting.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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