The Stentless Cryo-Life O'Brien porcine aortic valve at 10 years.

Background And Aim Of The Study: If stentless devices--with their physiological advantages--are to remain attractive, their long-term durability must equate with that of reference stented valves.

Methods: Between August 1991 and August 2001, 650 patients (mean age 72.0+/-4.