Fig 1.
The effect on cerebral blood flow and cerebral metabolic rate for oxygen (ml of oxygen consumed per 100 g of brain per min) of 0.75 minimum alveolar concentration of halothane (red) and isoflurane (magenta) when superimposed on a background anesthetic of morphine and nitrous oxide (top) or pentobarbital (bottom), with the latter administered in sufficient dose to achieve deep electroencephalographic burst suppression. B-S = burst suppression; CMRO2= cerebral metabolic rate for oxygen.