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Related Experiment Videos

Processing factors as determinants of tissue valve calcification.

W M Neethling1, J J Van Den Heever, J M Meyer

  • 1Department of Cardio-Thoracic Surgery, Faculty of Medicine, University of the Orange Free State, Bloemfontein, Republic of South Africa.

The Journal of Cardiovascular Surgery
|May 1, 1992
PubMed
Summary

Processing factors significantly impact tissue valve calcification. Low-temperature ischemia and specific blocking agents like AlCl3 can reduce calcification in bioprostheses, crucial for tissue valve engineering.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cardiovascular Research

Background:

  • Tissue valve calcification is a major limitation in bioprosthetic heart valves.
  • Understanding processing factors influencing calcification is critical for improving bioprosthesis longevity.

Purpose of the Study:

  • To investigate the effects of various processing factors on tissue valve calcification in a rat model.
  • To identify processing parameters that can mitigate or enhance valve calcification.

Main Methods:

  • Subdermal rat model used to assess tissue valve calcification.
  • Evaluated effects of tissue ischemia (4°C, 25°C), blocking reagents (KH2PO4, T6, MgCl2, AlCl3), fixation pressures (0-20 mmHg), and pH (3.72, 7.40).
  • Tensile strength tests and histological analysis performed.

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Main Results:

  • All blocking reagents weakened valve tissue.
  • Ischemia at 4°C decreased calcification; ischemia at 25°C increased it.
  • KH2PO4, T6, and MgCl2 reduced calcification; AlCl3 (at pH 3.72) nearly prevented it.
  • Fixation pressure had no significant effect.

Conclusions:

  • Processing factors, including temperature, blocking agents, and pH, significantly influence tissue valve calcification.
  • AlCl3 pretreatment at low pH is highly effective in preventing calcification.
  • These findings are vital for optimizing the design and processing of glutaraldehyde-treated porcine bioprostheses.