Blood flow redistribution in the transposition response of the rat.

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Abstract
Changes in blood flow in different arteries occurring in the transposition response of the rat, induced by transposing the animal from a home cage to a new one, were studied using chronically implanted electromagnetic flow probes. Inthe response, hindquarter flow was increased by > 50%, superior mesenteric and renal flows were decreased by .apprx. 30 and 15%, respectively, and common carotid flow remained almost unchanged. The increase in hindquarter flow in the response was much less after .beta.-adrenoceptor blockade with propranolol. In adrenalectomized rats the flow changes in the hindquarter, mesenteric and renal areas were less marked in either direction. Apparently, the blood flow redistribution in the transposition response is characterized by a shift of flow from the viscera to the skeletal muscles, in which the .alpha.- and .beta.-effects of catecholamines released from the adrenal medulla in the response play a dominant role.

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