Atrioventricular Valve Procedures with Repeat Fontan Operations: Influence of Valve Pathology, Ventricular Function, and Arrhythmias on Outcome

Risk factors for poor outcome are severe ventricular dysfunction, right or ambiguous single ventricle, age greater than 25 years, and ischemic time greater than 100 minutes. Mitral valves are potentially more amenable to repair than are tricuspid valves. Prosthetic valve replacement should be considered when valve repair is questionable.