Cerebral Resistance Arteries Research Articles

The effects of “dry” heat on the circulation of man. Cerebral hemodynamics

The effect of an exposure to a warm and dry environment (98°F. and 40 per cent relative humidity) for 2 hours on the cerebral blood flow was investigated in resting, normal subjects, as well as in patients with diseased left ventricles. The reduced perfusion pressure caused by the ensuing reduction in the systemic arterial pressure was attended by a maintenance of the cerebral blood flow at control levels. This was due to a significant reduction in the cerebral arterial resistance caused, at least in part, by a significant elevation of the arterial pCO 2.