Systemic atrioventricular valve regurgitation in corrected transpositon of the great vessels. Angiographic differentiation of operable and nonoperable valve deformities.

Abnormalities of the systemic atrioventricular (A-V) valve are frequently present in patients with corrected transposition. Systemic A-V valve regurgitation is usually present and may be amenable to operative correction with valve replacement if the regurgitation is caused by normally positioned but deformed valve leaflets or a dilated valve ring, or both. Systemic A-V valve regurgitation secondary to the more common Ebstein-type malformation of the inverted tricuspid valve is an inoperable conditon at present. Displacement of the valve leaflets below the level of the valve ring may be seen in the angiocardiograms of patients with this finding and is the differentiating feature between the two lesions. Ten cases of systemic A-V valve regurgitation in patients with corrected transposition are reviewed to illustrate these features.