Journal of Artificial Organs

, Volume 4, Issue 4, pp 298–302 | Cite as

Increased risk for double valve replacement with tissue and mechanical prostheses

  • Yoshio Misawa
  • Katuo Fuse
  • Tsutomu Saito
  • Hiroaki Konishi
  • Shin-ichi Oki
Original Article Artificial Valve


We wanted to determine whether there is any advantage of using a mitral tissue valve, when aortic and mitral valves are simultaneously replaced. We placed a tissue valve in the mitral position and a mechanical valve in the aortic position in 22 cases (combined group). In 31 other double valve replacements, mechanical prostheses were chosen for both positions (mechanical group). The mean follow-up time for the combined group was 8.9 years, and that for the mechanical group was 7.2 years. The 10-year survival rate and freedom from thromboembolism at 10 years were not different in the two groups. Treatment-related hemorrhage was seen in 3 patients of the combined group alone. Five patients among the combined group underwent reoperation because of bioprosthetic dysfunction, and the rate of freedom from reoperation at 10 years was 75 ±12%. The rate of freedom from all complications at 10 years was 43±11% for the combined group and 70±8% for the mechanical group. We find no advantage in mixing aortic mechanical and mitral tissue valves when performing double valve replacement.

Key words

Valve replacement Tissue valve Mechanical valve 


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Copyright information

© The Japanese Society for Artificial Organs 2001

Authors and Affiliations

  • Yoshio Misawa
    • 1
  • Katuo Fuse
    • 1
  • Tsutomu Saito
    • 1
  • Hiroaki Konishi
    • 1
  • Shin-ichi Oki
    • 1
  1. 1.Department of Thoracic and Cardiovascular SurgeryJichi Medical SchoolTochigiJapan

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