Mitral valve replacement (MVR) in a patient with a small or normal-size left ventricle necessitates the use of a low-profile prosthesis or a porcine xenograft. This retrospective study summarizes the clinical and hemodynamic findings in 88 patients in whom such valves were implanted. Isolated MVR was performed in 74 patients and MVR plus tricuspid valve replacement with the same type of prosthesis in 14 patients. Preoperative hemodynamic findings and the number of patients in each group were comparable. Early (< 30 days) and 6 month mortality rates were Kay-Shiley (KS) 33 and 48 percent, Starr-Edwards No. 6520 (SE) 14 and 25 percent, porcine xenografts (P) 6 and 12 percent. The incidence of fatal postoperative arrhythmias was 11 percent with KS valves, 11 percent with SE valves, and 6 percent with P valves. Postoperative thromboembolic complications occurred in 33 percent of patients with KS valves, 28 percent with SE valves, but were not observed in any patient with a P valve. The hemodynamic performance of all three valve types was similar as measured at postoperative catheterization; the calculated orifice areas and diastolic gradients were not significantly different in the three groups. However, the significantly lower early mortality rate and the absence of thromboembolic complications make the porcine xenograft a superior choice for patients with normal or small-size left ventricles.
|Original language||English (US)|
|Number of pages||9|
|State||Published - Dec 1974|
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