Tilping disc Valve VS. Porcine xenograft

Abstract

The auther carried out a comparative study of the behaviour of mechanical valves (tilting disc valves) and porcine xenograft valves experimentally and clinically. The experimental study revealed a significant difference between these two types of valves in resistance and regurgitation. Hemodynamic paramoters were examined in isolated mitral valve replacement cases pre and postoperatively. Cardiac index, pulmonary artery wedge pressure, pulmonary artery systolic pressure, left ventricular endodiastolic volume index, left ventricular endosystolic volume index, left ventricular ejection fraction were almost same for both types of valves. The postoperative valve area was determined 1.8cm² for tilting disc valve and 1.1cm² for porcine xenograft. Carpentier-Edwards valve which was obtained from a pt on re-operation was examined using our valve testing apparatus. The result showed that the biological material was not homogenous. We concluded therefore that xenograft prosthesis are at present not ideal valve prosthesis.