Cardiac Physiology in Dog During Rewarming From Deep Hypothermia

Abstract

Dogs subjected to immersion hypothermia may be successfully rewarmed from a mean heart temp. of 16.2[degree]C when placed in a 45[degree] bath. The return to normal of pulse rate, blood pressure, P-R, Q-T, and the duration of systole and isometric relaxation reflects that observed during cooling, suggesting that within the temp. limits 38[degree]-16.2[degree] altered function is not ascribable to temp.-induced pathology but rather to altered metabolic rate. Subendocradial ecchymoses frequently observed at autopsy are without apparent influence on the course of cooling or rewarming.