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In vivo microarterial freezing: experimental study

P C Cavadas1, F J Vera-Sempere

  • 1Department of Plastic Surgery, La Fe Universitary Hospital, Valencia, Spain.

Microsurgery
|January 1, 1996
PubMed
Summary
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Freezing microarteries with ethyl chloride effectively relieves arterial spasm without causing thrombosis. Studies show frozen arteries maintain 100% patency after microsurgical repair, comparable to unfrozen vessels.

Area of Science:

  • Vascular surgery
  • Microsurgery
  • Cryobiology

Background:

  • In vivo freezing of microarteries can relieve spasm.
  • Previous research indicates freezing does not induce thrombosis.

Purpose of the Study:

  • To investigate the patency rates of microanastomoses in pre- and post-frozen rat femoral arteries.
  • To evaluate the histological changes and healing process of frozen and repaired arteries.

Main Methods:

  • Rat femoral arteries were frozen using ethyl chloride.
  • Anastomoses were performed on prefrozen (before) and postfrozen (after) vessels.
  • Patency rates were assessed at 2, 10, and 30 days post-surgery.
  • Histological examination evaluated vessel wall integrity and endothelial regeneration.

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Main Results:

  • 100% patency rates were observed in both prefrozen and postfrozen groups at all time points.
  • Histology revealed initial intimal layer loss and elastic lamina fragmentation.
  • Progressive cellular repopulation and endothelial regeneration were noted over time.
  • No significant differences in healing were observed between prefrozen and postfrozen arteries.

Conclusions:

  • Ethyl chloride freezing effectively reverts arterial spasm without inducing thrombosis.
  • Microsurgical anastomosis of frozen arteries yields high patency rates, comparable to virgin arteries.
  • Frozen arteries demonstrate capacity for cellular regeneration and endothelial repair.