A decade of experience with the Model 103 and 104 Beall valve prostheses.

Mitral or tricuspid valve replacement with the Beall Model 103 or 104 prosthesis has been associated with a high incidence of late prosthetic malfunction which has necessitated reoperation. Between 1972 and 1975, 57 patients underwent single valve replacement (55 mitral and two tricuspid) with Beall Model 103 or 104 valvular prostheses and survived at least 2 years. The mean follow-up time was 73.7 months (range 24 to 119 months). Of these patients, 22 required explantation of the prosthesis; there was an operative mortality of 27%. Major prosthetic malfunction occurred in four patients: Two occluders were embolized and two occluders were fixed in the open position. All four patients required urgent operation, and two of them died. The development of symptoms of congestive heart failure, systolic murmur, or hemolysis were the reasons for cardiac catheterizations and possible reoperation. Nineteen patients had cardiac catheterization. Fifteen of these subsequently underwent reoperation, with a mortality of 26%. Three patients were considered inoperable. Cardiac catheterization data revealed significant prosthetic regurgitation in all patients: pulmonary capillary pressure 29.9 mm Hg +/- 6.7 (standard deviation); V wave 31.5 mm Hg +/- 12.0; left ventricular end-diastolic pressure 18.0 mm Hg +/- 7.8. Comparison of hemolysis indicators in this group to those of asymptomatic patients revealed that the former had a significant elevation in lactic dehydrogenase (p = 0.038) and a lowered hematocrit value (p = 0.017). Waiting for severe symptomatic deterioration to justify reoperation risks the development of left ventricular dysfunction and possible emergency reoperation with a high operative mortality.