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  • Title: [The Bjoerk-Shiley and the Lillehei-Kaster valve in aortal position. A hemodynamic comparison].
    Author: Diggelmann UP, Krayenbühl HP, Rothlin M, Senning A.
    Journal: Schweiz Med Wochenschr; 1978 Jan 21; 108(3):92-7. PubMed ID: 622538.
    Abstract:
    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.
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