Mitral valve replacement is a common procedure. Degeneration of the valve is a complication that usually develops progressively. We discuss three cases of patients who underwent mitral valve replacement by means of a porcine bioprosthesis and who developed sudden and severe mitral regurgitation years after implantation.
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Division of Cardiology, Department of Medicine, University of California, San Francisco (L.C., S.D., D.B., J.J.T., Q.F., L.T., A.H.R., R.J., S.H., H.H.H., Z.H.T., N.B.S., F.N.D.).
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