Evidence of Impending Embolization of a Calcific Cusp Fragment from a Mitral Porcine Xenograft1

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Abstract
The use of porcine bioprostheses has been associated with a low rate of embolic complications. The case here presented provides evidence that systemic emboli in porcine valve recipients may not necessarily be due to intracardiac or prosthetic thrombosis, but to detachment and migration of fragments of degenerated cusp tissue. Therefore, urgent assessment of xenograft function is recommended in patients with a porcine bioprosthesis who experience embolic episodes late postoperatively.

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