[An experimental study on the protective effect of nizofenone in cerebral ischemia]

Using the "canine model of complete ischemic brain regulated with a perfusion method" in which it is possible to control the degree of blood flow to a cerebral hemisphere via a perfusion pump, the protective effects of nizofenone against cerebral ischemia was investigated. After pre-treatment with nizofenone, blood flow was reduced via the pump to 1/10 of the normal state and 1 hour later, return to the normal state was allowed. Subsequent changes in EEG activity were observed and the effect of nizofenone evaluated. In the control group, no recovery of EEG was seen following recirculation, but in the group treated with nizofenone, gradual emergence of slow waves was observed. And the degree of recovery of EEG was better in the group administered a large dosage than in those given a low dosage. Our study suggested that within the dose ranges tested, nizofenone ameliorated ischemic brain damage in a dose dependent fashion. But the application of this experimental results to the human clinical situation requires that particular note should be paid to the dangers of transient fall of blood pressure at higher dosages.