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Objectives This retrospective study compares porcine with bovine bioprosthesis in mitral position with regard to valvular degeneration. Methods Between 2005 and 2019, 15 patients underwent mitral valve replacement with porcine Epic biological valve (St-Jude) and 15 patients underwent mitral valve replacement by bovine Carpentier –Edwards Perimount biological valve and follow up ecocardiogarphy was done to evaluate valvular degeneration of both types Results Bovine type showed longer durability than porcine and less valvular degeneration within 14 years of follow up regardless age of patient, cause of valve replacement, or lesion of valve Coclusion: Bovine bioprothesis are better than porcine regarding durability

Post operative echocardiographic follow up after mitral valve replacement by different types of biological valves