PMID: 9523607Apr 2, 1998Paper

Microcirculatory studies of frostbite injury

Annals of Plastic Surgery
N ZookH Suchy

Abstract

Frostbite represents a spectrum of injury ranging from irreversible cellular destruction to reversible changes seen after rewarming. These changes include increases in tissue edema, circulatory stasis, and progressive thrombosis leading to further tissue necrosis. For this reason, it is often difficult at the time of surgical debridement to determine the extent of frostbite injury. This delayed tissue injury is similar to that seen in muscle during ischemia/reperfusion injury. Muscle that initially appears viable on reperfusion may subsequently necrose due to collapse of the microcirculation. Adherent neutrophils have been specifically cited as important components in ischemia/reperfusion injury and have also been suggested to play a role in frostbite injury. We have used an intravital microscopic muscle preparation to study microcirculatory changes carefully in frostbite injury during rewarming. The right gracilis muscle of male Wistar rats is dissected free from its primary vascular pedicle and the rat is positioned on a specially constructed microsurgical stage. Temperature changes of the muscle are recorded. The prepared axial pattern flap is transilluminated with a microscope and projected on a video screen, allowing measu...Continue Reading

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