Blood Flow Changes in the Dog During Hyperthermia

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Abstract
A study was made of blood-flow changes in anesthetized dogs made hyperthermic with 2,4-dinitrophenoI, or with radiant heat. Venous outflow was measured in the lingual and saphenous veins after heparinization. When the rectal temp. reached about 40[degree] C the venous outflow from the tongue showed a sharp increase, and reached a max. level about 6 times that of the control flow when the temp. was 42-43[degree]C. The rise in lingual blood flow appeared at about the same time as the panting response. In contrast, blood flow from the saphenous vein showed no consistent change when body temp. was elevated. Pulse amplitude measurements with a photoelectric plethysmograph and surface temp. readings of the tongue and foot indicated the same qualitative changes as did the venous outflow technique. Plethysmographic and temp. studies of the ear and of an intestinal loop showed no consistent blood-flow changes with body temp. change. Findings indicated that the panting response of the dog is accompanied by a marked increase in blood flow to the tongue, thus aiding in dissipation of heat from the buccal area.

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