Aorto-ventricular tunnel

Aorto-ventricular tunnel (also known as aortico-ventricular tunnel or aorto-left ventricular tunnel) is a rare congenital heart defect characterized by an abnormal channel (tunnel) that connects the ascending aorta to either the left or, less commonly, the right ventricle. This tunnel bypasses the aortic valve and creates a direct communication between the aorta and the ventricular chamber, resulting in significant aortic regurgitation (backflow of blood from the aorta into the ventricle). The condition is present from birth and primarily affects the cardiovascular system. Clinically, aorto-ventricular tunnel typically presents in the neonatal or early infantile period with signs and symptoms of volume overload on the heart, including a continuous or to-and-fro heart murmur, bounding pulses, heart failure, failure to thrive, tachypnea (rapid breathing), and feeding difficulties. If left untreated, the chronic volume overload can lead to progressive left ventricular dilation and dysfunction. The tunnel may also be associated with other cardiac anomalies, including abnormalities of the aortic valve or coronary artery origins. The primary treatment for aorto-ventricular tunnel is surgical repair, which is recommended as soon as the diagnosis is made, ideally in the neonatal or early infantile period, to prevent irreversible ventricular damage. Surgical closure of the tunnel, either by direct closure or patch repair of the aortic end of the tunnel, has shown good outcomes when performed early. In some cases, aortic valve repair or replacement may also be necessary. Long-term follow-up is essential, as late complications including aortic regurgitation and the need for reoperation can occur. Prognosis is generally favorable with early surgical intervention.

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