Theoretical evaluation of contributions of heat conduction and countercurrent heat exchange in selective brain cooling in humans.

摘要: The purpose of this work is to evaluate the capacity heat loss from carotid artery in human neck and thus, provide indirect evidence existence selective brain cooling humans during hyperthermia. A theoretical model developed describe effects blood flow rate vascular geometry on thermal equilibration based anatomical neck. potential for its way by exchange with jugular vein radial conduction cool surface evaluated. It shown that arterial can be as much 1.1°C lower than body core temperature, which agreement previous experimental measurements difference between tympanic temperatures. also evaluates relative contributions countercurrent cooling. found these mechanisms are comparable each other. Results present study will help a better understanding thermoregulation © 2000 Biomedical Engineering Society.