Long-Term Results of the Gamma-Irradiation-Preserved Homograft Monocusp for Transannular Reconstruction of the Right-Ventricular Outflow Tract in Tetralogy of Fallot

Summary The long-term results of a consecutive series of transannular gamma-irradiated homograft monocusp patches in tetralogy of Fallot were studied. Seven survivors out of 8 patients are doing clinically well after a mean of 22.4 years of follow-up, 5 of them being in New York Heart Association class I and 2 in class II. In one patient the completely calcified gamma-irradiated homograft monocusp patch was replaced 15 years after intracardiac repair. Echocardiographic investigation at the end of follow-up of the remaining 6 patients with a gamma-irradiated homograft monocusp patch in situ showed mild pul monary regurgitation in 1, moderate regurgitation in 3, and severe regurgitation in 2. Residual pulmonary stenosis was present in 4 patients (gradients ranging from 10 to 40 mmHg). Right-ventricular dilatation was present in all patients. In the long-term the gamma-irradiated transannular homograft monocusp patch behaves like a simple transannular patch.