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Related Concept Videos

Tissue Transplantation01:24

Tissue Transplantation

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Tissue transplantation is a significant medical procedure involving the transfer of cells, tissues, or organs from a donor to a recipient, with the primary aim of restoring lost functions. This procedure is crucial in treating a broad spectrum of diseases, including kidney diseases, liver failure, heart disease, and certain types of cancers.
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The biology of tissue transplantation hinges on the Major Histocompatibility Complex (MHC) molecules. These molecules...
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Ischemia Time in Extremity Allotransplantation: A Comprehensive Review.

Anjali Chakradhar1, Jessica Mroueh2, Simon G Talbot1,2

  • 1Harvard Medical School, Boston, MA, USA.

Hand (New York, N.Y.)
|November 19, 2024
PubMed
Summary

Optimizing ischemia time is crucial for limb survival and function in vascularized composite allotransplantation (VCA). Early reperfusion, especially within 3-6 hours of cold ischemia, enhances functional recovery and reduces graft rejection risks.

Keywords:
ischemiaupper extremity replantationvascularized composite allotransplantation (VCA)

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Area of Science:

  • Transplantation immunology
  • Vascular surgery
  • Regenerative medicine

Background:

  • Limb loss is a significant clinical challenge.
  • Extremity vascularized composite allotransplantation (VCA) offers a transformative solution.
  • Ischemia duration critically impacts graft survival and function.

Purpose of the Study:

  • To analyze the effects of warm and cold ischemia on limb survival and functional recovery in VCA.
  • To identify critical timeframes for reperfusion to optimize outcomes.
  • To highlight gaps in current literature regarding cold ischemia and functional recovery.

Main Methods:

  • Literature review of warm ischemia from replantation/revascularization studies.
  • Analysis of cold ischemia data relevant to VCA preservation.
  • Extrapolation of findings from small animal models (rats) to predict functional recovery.

Main Results:

  • Warm ischemia: reperfusion within 5-6 hours for survival, 3 hours for function.
  • Cold ischemia: reperfusion within 10-12 hours recommended for VCA.
  • Significant data gap exists for extremity functional recovery after cold ischemia in humans/large animals.

Conclusions:

  • Ischemia management is paramount for successful extremity VCA.
  • Prolonged ischemia increases graft rejection and tissue damage (muscle, nerve).
  • Future research should focus on optimizing ischemia protocols and exploring advanced perfusion techniques.