THE EFFECT OF HEAT ON BLOOD AND LYMPH FLOW FROM THE GASTRO-INTESTINAL TRACT

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Abstract
Heat was applied to the lumen of isolated segments of the small intestine and the colon at temps. ranging from 52.2[degree] to 57.7[degree]C by using a specially devised hollow rubber applicator. Under these circumstances the rate of flow of blood through the treated tissue was markedly augmented, unless the mucosa was injured. In some expts. the rate of flow was doubled and in others it was quadrupled. This procedure had no measurable effect on the rate of flow of lacteal lymph. However, the secretion of succus entericus was markedly augmented. temps. of 52[degree]C were applied to the lumen of the stomach without effecting the flow of lymph from the thoracic duct. Burns occurred in 3 out of 4 exps. in which the applicator temp. was 54.4[degree]C or more. When the temp. was maintained at 52.2[degree]C, burns occurred only when the applicator was of such size that it distended the segment, or caused it to contract vigorously. The contractile response of the colon was rendered more sensitive than the small intestine to the injury produced by the heat of the relatively too large applicators. Injury resulted in a decrease in blood flow and an increase in lymph flow.

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