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- W2100054776 abstract "Premature failure of implanted commercial bioprosthetic aortic heart valves has been associated with the reduction in the natural shearing ability of the valve cusp tissue after conventional low pressure static glutaraldehyde fixation. Dynamic fixation in 0.5% glutaraldehyde at variable pulsation rates (1-10 Hz) and pressures (0-40 mmHg) was investigated as a technique that may preserve the natural shearing ability of the tissue by reducing interfibre crosslinking. When tested in our high speed materials testing system, the dynamically-fixed tissue was observed to relax more quickly (mean /spl plusmn/S.D.)(-7.4/spl plusmn/0.7% stress remaining per log(second)) (n=5) than the conventionally statically fixed (-3.9/spl plusmn/1.7% log(s)/sup -1/)(n=5) and similar to the fresh material (-6.7%/spl plusmn/1.2% log(s)/sup -1/)(n=7), Denaturation temperatures suggest greater internal crosslinking and thermostability for dynamically fixed valves (89.4/spl plusmn/0.5/spl deg/C)(n=4) compared to the statically fixed (83.5/spl plusmn/0.3/spl deg/C)(n=4) or fresh tissue (65.6/spl plusmn/0.8/spl deg/C)(n=4)(p<0.05). This technique appears promising in that a tissue with micromechanics closer to that of the natural aortic valve is produced." @default.
- W2100054776 created "2016-06-24" @default.
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- W2100054776 date "2002-11-19" @default.
- W2100054776 modified "2023-09-27" @default.
- W2100054776 title "Effect of dynamic fixation parameters on the viscoelastic properties of bioprosthetic porcine aortic heart valve tissue" @default.
- W2100054776 cites W2013898642 @default.
- W2100054776 doi "https://doi.org/10.1109/iembs.1995.575024" @default.
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