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The Effect of Interruption of the Reticular Activating System on Metabolism in Canine Cerebral Hemispheres before and after Thiopental

The reticular activating system (RAS) was interrupted (producing a decerebrate state) in five dogs by midbrain lesions made at the level of the superior colliculi. In five other dogs the midbrain was identically exposed, but no lesion was made. The effects of interruption of the RAS on canine cerebral metabolism and on the metabolic response of the cerebral hemispheres to thiopental were then studied. No significant difference in cerebral metabolic rate for oxygen or cerebral blood flow between the decerebrate and the intact dogs was observed, and the cerebral metabolic responses to thiopental were identical in the two groups. These results conflict with the classic view that anesthetic agents selectively and reversibly depress the RAS and that the RAS is a selective site of action of thiopental.