Figure 1. The Björk-Shiley tilting disk aortic prosthesis is inspected through the dissected aortic root 37 years after implantation. The valve is tightly adhered to the aortic annulus with no evidence of perivalvular leak. The tilting disk and the holding mechanism show no structural deformity or sign of fatigue despite opening for more than 1,3 billion cycles.
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