Effect of Plaster Cast on Tourniquet Shock.

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Abstract
Tourniquet shock in rats cannot be prevented by a rigid cast applied to the hind extremity immediately after removal of the tourniquet. The cast limits swelling of the limb proper and causes a shift of extravasated fluid upward into the fascial planes between subcut. tissue and abdominal muscles. The effect of the cast is to reduce the rapidity rather than the ultimate magnitude of local fluid loss. Survival time of the animals is prolonged, but there is no decrease in mortality. The development of shock is accompanied by hemoconcentration and rise in serum creatine, both of which occur more gradually than in control rats without casts.
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