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Related Experiment Videos

Disc failure in a Björk-Shiley mitral prosthesis

C Van Sabben1, S C Griffin, G E Venn

  • 1Department of Cardiac Surgery, St Thomas' Hospital, London, United Kingdom.

The Journal of Heart Valve Disease
|September 1, 1994
PubMed
Summary

A 50-year-old man

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Area of Science:

  • Cardiovascular Surgery
  • Biomaterials Science

Background:

  • Björk-Shiley spherical valves are mechanical heart valves used in cardiac surgery.
  • Valve malfunction can necessitate reoperation, posing surgical risks.
  • Pyrolytic carbon is a common material used in prosthetic heart valves due to its durability.

Observation:

  • A 50-year-old male patient presented with a malfunctioning Björk-Shiley spherical valve.
  • The valve had been implanted 14 years prior to the current presentation.
  • Reoperation was performed to address the valve dysfunction.

Findings:

  • Examination of the explanted Björk-Shiley valve revealed a critical finding: a missing segment of the pyrolytic carbon disc.
  • Despite the structural defect, there was no evidence of embolization, meaning the detached carbon fragment did not travel to other parts of the body.
  • The patient experienced a satisfactory recovery following the surgical intervention.

Implications:

  • This case highlights a potential failure mode in long-term implanted Björk-Shiley spherical valves, specifically pyrolytic carbon disc fracture.
  • The absence of embolization in this instance suggests that such fractures may not always lead to catastrophic embolic events.
  • Further investigation into the long-term durability and failure mechanisms of mechanical heart valves is warranted to improve patient outcomes and device design.

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