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Updated: Sep 13, 2025

A Pre-clinical Rat Model for the Study of Ischemia-reperfusion Injury in Reconstructive Microsurgery
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Ischemia-Reperfusion Injury in a Composite Tissue Microsurgical Model.

Aida K Sarcon1, Rou Wan2, Ramona L Reisdorf2

  • 1From the Division of Plastic and Reconstructive Surgery.

Plastic and Reconstructive Surgery
|July 30, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a new microsurgical model to assess ischemia-reperfusion injury in composite tissues. Muscle tissue showed greater damage than skin, indicating muscle vulnerability during reperfusion injury.

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Area of Science:

  • Microsurgery
  • Tissue engineering
  • Ischemia-reperfusion injury

Background:

  • Developing a reliable microsurgical model is crucial for studying composite tissue (muscle/skin) ischemia-reperfusion (I/R) injury.
  • Existing models may not fully capture the complexity of I/R in musculocutaneous flaps.

Purpose of the Study:

  • To present a novel microsurgical model for investigating I/R injury in rodent biceps femoris musculocutaneous flaps.
  • To compare tissue damage in I/R flaps versus sham controls.

Main Methods:

  • Male rats were divided into I/R (N=10) and sham (N=9) groups.
  • The I/R group underwent flap elevation, collateral ligation, and 3-hour arteriovenous clamping followed by reperfusion.
  • Perfusion was monitored with laser-speckle imaging; flap discoloration and tissue/serum injury markers were assessed on postoperative days 1 and 3.

Main Results:

  • Ischemia-reperfusion significantly reduced flap perfusion and increased ischemia over time.
  • At postoperative day 1, the I/R group exhibited elevated serum creatine kinase and potassium levels.
  • Muscle tissue in the I/R group showed significantly higher apoptosis, myonecrosis, and inflammation compared to sham, with effects persisting to postoperative day 3. Skin showed similar injury levels.

Conclusions:

  • The developed model effectively reproduces I/R injury in composite tissues with a 3-hour ischemic period.
  • Muscle tissue is more susceptible to I/R injury than skin in this model.
  • Peak muscle injury occurs within 24 hours, suggesting this critical window for potential therapeutic interventions.