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July 21, 1951

THERMAL GRADIENTS IN THE VASCULAR SYSTEM

JAMA. 1951;146(12):1137. doi:10.1001/jama.1951.03670120047014
Abstract

Recent data on intracardiac and deep intravascular temperatures are of interest, since the mechanisms that normally maintain temperature within narrow limits are not yet well understood. Horvath, Rubin, and Foltz1 measured the temperature in various blood vessels and tissues in the anesthetized dog by means of thermocouples fitted into plastic catheters and reported the presence of thermal gradients in the vascular tree, indicative of sites of increased heat production. Employing similar techniques, Eichna and his associates2 measured the temperature in the right side of the heart, in the deep vessels leading to the right side of the heart, in the femoral artery, and in the rectum in 24 afebrile and five febrile hospitalized subjects. Temperatures in the right side of the heart, pulmonary artery, and femoral artery were found to be equal and consistently less than that in the rectum. In afebrile patients, the average difference between rectal

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