Replacement of a Björk-Shiley Delrin Aortic Valve Still Functioning after 25 Years

We report the case of a patient who had undergone implantation of a Bjork-Shiley Delrin valve in the aortic position 25 years earlier and who now presented with severe mitral stenosis. The patient underwent mitral valve replacement and aortic valve re-replacement. We review the justification for prophylactic replacement of Bjork-Shiley Delrin heart valves.