Hyperthyroidism and the Dynamics of Distribution and Renal Excretion of Epinephrine in the Dog

¹ From the Department of Physiology, University of Oregon Medical School, Portland, Oregon

Several parameters related to the dynamics of distribution and renal excretion of epinephrine were studied in anesthetized dogs before and during oral administration of thyroid extract. These parameters include: a) plasma concentration and renal excretion of epinephrine during constant infusion of l-epinephrine bitartrate, b) the rate of disappearance from plasma and volume of distribution of epinephrine, and c) the resting excretion of endogenous epinephrine before and during thyroid feeding. Except for an increase in the percentage of infused epinephrine excreted in the urine, there were essentially no changes in these parameters after feeding thyroid.