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Circulatory changes after prolonged ischemia in the epigastric flap
F Fitzal1, D Valentini, R Mittermayr
1Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria.
Journal of Reconstructive Microsurgery
|October 13, 2001
Summary
Prolonged ischemia and reperfusion injury in epigastric flaps leads to diffuse circulation and no-reflow, causing tissue necrosis. Early laser Doppler imaging perfusion may not predict long-term flap survival.
Area of Science:
- Regenerative Medicine
- Vascular Surgery
- Tissue Engineering
Background:
- Ischemia and reperfusion (I/R) injury involves complex pathophysiologic processes.
- Superficial perfusion and vessel distribution are critical for flap survival.
- Understanding I/R effects on flaps is vital for reconstructive surgery.
Purpose of the Study:
- To assess superficial perfusion and vessel distribution of epigastric flaps during I/R using laser Doppler imaging (LDI).
- To evaluate clinical outcomes 7 days post-reperfusion in a rat model.
- To investigate the relationship between early perfusion and late flap viability.
Main Methods:
- Male Sprague-Dawley rats underwent sham procedures or 12-hour ischemia followed by 3-hour reperfusion.
- Laser Doppler Imaging (LDI) system was used to measure flap perfusion.
- Flap size, failure index, and histology were assessed 7 days post-reperfusion.
Main Results:
- LDI revealed diffuse flap perfusion post-reperfusion, with circulation arrest in distal portions.
- 12-hour ischemia significantly decreased perfusion compared to sham animals (77% vs. 108% PU).
- Flaps showed shrinkage, increased failure index, necrosis, edema, and leukocyte infiltration by day 7.
Conclusions:
- Prolonged ischemia leads to diffuse circulation and "no-reflow" in distal flap regions during reperfusion.
- Early LDI-assessed perfusion does not guarantee long-term flap survival due to potential delayed necrosis.
- Edema and leukocyte infiltration are key indicators of I/R damage in this flap model.