[The Bjoerk-Shiley and the Lillehei-Kaster valve in aortal position. A hemodynamic comparison].
Thirty-two patients with tilting disc valves in the aortic position were evaluated by left heart catheterization and cineangiography. 24 patients had Björk-Shiley valves (B-S group) and 8 Lillehei-Kaster valves (L-K group). At the postoperative hemodynamic evaluation, left ventricular peak systolic pressure was significantly (p less than 0.001) higher in the L-K group (174 +/- 22 mm Hg) than in the B-S group (140 +/- 22 mm Hg). The mean systolic pressure gradient across the prosthesis was significantly (p less than 0.001) higher in the L-K group (34 mm Hg) than in the B-S group (12 mm Hg). The calculated valve area at a similar average tissue annulus diameter was significantly smaller in the L-K group (0.9 cm2) than in the B-S group (1.5 cm2). It is concluded (1) that in the aortic position at similar external prosthesis dimensions the B-S valve exhibits superior hemodynamic performance of the L-K valve and (2) that aortic valve replacement by L-K valve is associated with significant postoperative left ventricular pressure load.
D001021:Aortic Valve; D001794:Blood Pressure; D006328:Cardiac Catheterization; D002932:Cineangiography; D006350:Heart Valve Prosthesis / Q000295:instrumentation*; D006439:Hemodynamics; D006801:Humans
Die Bjoerk-Shiley-und die Lillehei-Kaster-Klappe in aortaler Position. Ein hämodynamischer Vergleich.