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Effects of Thermal Stress and Epinephrine on Uterine Blood Flow in Ewes

University of Florida, Gainesville 32611

Abstract

Four multiparous ovariectomized ewes, fitted with electromagnetic blood flow transducers around one mid-uterine artery, were utilized in two latin square design experiments to evaluate interrelationships of thermal stress and epinephrine on an increase in uterine blood flow (UBF) induced by estradiol. Estradiol (20 µg) was injected into the femoral vein and the subsequent induced increase in UBF was evaluated in response to thermal stress (21 vs 32 C; Experiment I) and the interaction of thermal stress with epinephrine (Experiment II). Thermal stress reduced the estradiol-induced increase in UBF (ml/min) by 37% and a combination of thermal stress plus epinephrine infusion (.20 µg/kg body weight/min for 150 min) reduced UBF by 55%. Uterine blood flow is sensitive both to thermal streSs and epinephrine.

² Diary Science Department

³ Obstetrics and Gynecology Department.

⁴ D. Caton is recipient of a Career Development Award from NIH No. 5K04,flD70552-02. This study was supported in part by grants from the National Institutes of Health SR01, HDO 5659-07 and from the Foundation for Child Development.