Preliminary Results of a Comparative Test of Mechanical Bileaflet Valves and Tilting Disc Valves - Erste Ergebnisse eines Vergleichstests von mechanischen Zweiflügelklappen und Kippscheibenprothesen

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Abstract
In a mock circulation 16 mechanical heart valves, 11 bileaflet valves and 5 tilting disc valves, have been perfused pulsatingly in the mitral postition. Cardiac output varied between 2 l/min and 6 l/min; reflux and orifice area were measured. Mean orifice area, insufficiency, and discharge coefficient were calculated. Reflux of the tilting disc valves varied between 2 ml and 15 ml and is lower than reflux of the bileaflet valves. Reflux of the bileaflet valves comes up from 4 ml to 25 ml. Mean orifice area of the Bjork-Shiley valves varied between 106 mm2 and 214 mm2; mean orifice area of the Duromedics bileaflet valves comes up from 140 mm2 to 274 mm2; mean orifice area of the St. Jude Medical valves comes up to 373 mm2. Discharge coefficient CD of the St. Jude valves is higher than that of the Bjork-Shiley valves and the Duromedics valves. The values of the No. 29 valves are: Bjork-Shiley Monostrut: CD=0.46 .+-. 0.01; Duromedics: CD=0.61 .+-. 0.02; St. Jude Medical: CD=0.77 .+-. 0.04. The bileaflet valves show bigger orifice areas and lower pressure drop than the tilting disc valves. The tilting disc valves have lower reflux volume but smaller orifice areas than the bileaflet valves. The Duromedics valve as a new bileaflet model shows almost the same reflux volume than the Bjork-Shiley Monostrut. The values of the orifice area of the Duromedics valve lie between the values of the St. Jude Medical and the tilting disc valves.

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