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| - Morphological comparison of primary tissue failure (PTF) in porcine mitral and aortic bioprostheses in the same patient
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| - Clinical and pathological studies have not clearly demonstrated whetherprimary tissue failure (PTF) in porcine bioprostheses occurs more often inthe mitral than in the aortic position. We have studied morphologicalalterations in both positions in the same individual in 15 patients (14mitroaortic and 1 mitroaortotricuspid) reoperated upon for PTF.Bioprostheses explanted were photographed, radiographed and observed intransmitted polarizing light. All lesions received a score on the basis ofmorphological criteria. The creep of the stent was measured. Calcificationwas slightly heavier and the degree of creep was significantly greater inthe mitral position. Tears, infiltration and pannus growth did not differbetween the two positions. According to our study, there is no conclusivedemonstration that bioprostheses degenerate earlier and more extensively inthe mitral than in the aortic position.
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