SELECTIVE BRAIN COOLING AN IMPORTANT COMPONENT OF THERMAL PHYSIOLOGY
1981; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-08-027354-9.50043-0
Autores Tópico(s)Infrared Thermography in Medicine
ResumoPublisher Summary This chapter describes the selective brain cooling (SBC) as an important component of thermal physiology. The main problem in cerebral temperature regulation is the excess of heat produced in the brain. The heat is a by-product of cerebral metabolic processes. Heat production in mammalian brain is high relative to that of other tissues. Depending on their distance from the circle of Willis or splanchnocranial venous lakes, deep brain sites grow progressively warmer than the cerebral arterial or the cranial venous blood. The brain temperature is chiefly regulated by a continuous removal of cerebral heat with the circulating blood. In this regard, there is double protection of the brain against overheating. In normothermic mammals, the brain temperature remains slightly higher than the deep trunk temperature, and a great deal of the cerebral heat is removed by the arterial blood leaving the heart. The second mechanism of defense against cerebral overheating, called selective brain cooling (SBC), is utilized extensively under hyperthermic conditions and allows the brain to remain markedly cooler than the rest of the body. The SBC is not limited to carotid rete animals but is probably a common event in temperature regulation of hyperthermic animals.
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