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J Appl Physiol 43: 747-749, 1977;
8750-7587/77 $5.00
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Journal of Applied Physiology, Vol 43, Issue 4 747-749, Copyright © 1977 by American Physiological Society

ARTICLES

Heat production of fetal sheep brain in utero

R. M. Abrams, J. F. Clapp, M. Notelovitz, T. Tyler and S. Cassin

Thermojunctions were implanted in the brains of 10 near term fetal sheep in utero under halothane anesthesia. Brief total occlusion of fetal brachiocephalic artery was followed immediately by an increase in brain temperature (mean +/- SE) of 0.130 +/- 0.014 degrees C-min-1. Occlusion of main pulmonary artery and ascending aorta, simultaneously, led to a brain temperature increase of 0.144 +/- 0.018 degrees C-min-1. Specific heat of three fetal brains was determined to be 0.898 +/- 0.014 cal-g-1. degrees C-1 or 3.76 +/- 0.059 J-g-1. Rate of fetal brain heat production, computed as the product of the higher rate of temperature change and brain specific heat, was 0.129 +/- 0.014 cal-g-1-min-1 or 9.00 +/- 0.98 mW-g-1.




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