Download PDF
Thorac Cardiovasc Surg 1986; 34(3): 157-162
DOI: 10.1055/s-2007-1020400
© Georg Thieme Verlag Stuttgart · New York

In Vitro Evaluation of Six Mechanical and Six Bioprosthetic Valves

J. Fisher1 , I. J. Reece2 , D. J. Wheatley2
  • 1West of Scotland Department of Clinical Physics and Bioengineering
  • 2Department of Cardiac Surgery, Royal Infirmary, Glasgow, Scotland
Further Information

Publication History

1986

Publication Date:
09 May 2008 (online)

  PDF Download  Permissions and Reprints All articles of this category

Summary

The in vitro function of 6 tissue valves and 6 mechanical valves (all size 29) was assessed in a purpose-built pulse duplicator under different pulsatile flow conditions. Valve function was analyzed by measuring the mean pressure difference across each valve during forward flow, and the reverse flow through each valve during valve closure (dynamic regurgitation) and in the fully closed position (static regurgitation). Although valves of the same type showed similar characteristics, there were significant differences in function between different types of valves. Porcine valves showed much higher forward flow pressure gradients than pericardial, tilting disc, or bileaflet mechanical valves. However, the porcine valves showed least regurgitation, with pericardial valves having less regurgitation than mechancial valves.

Key words

Mitral valve - Bioprosthetic - Mechanical evaluation

      >