The literature contains no references to electroencephalographic recordings during sleep of patients with hydrocephalus. All previous studies of animals and man considered only waking activity. Extremely high-voltage alpha waves were reported in hydrocephalic patients by Kreezer1 and mixed fast and slow activity by Gibbs and Gibbs.2 Williams3 suggested that the slow activity that occurs in patients with high intracranial pressure is due not to the intracranial pressure per se but to cerebral edema. Stuart4 produced experimental hydrocephalus in kittens and found large slow waves which did not correlate with the height of the intracranial pressure. He concluded that the slowing cannot be due to edema because it disappears too quickly when the intracranial pressure is reduced. Stein and Sonnenschein,5 in acute experiments on cats, found a general inverse relation between the height of the intracranial pressure and the frequency of cortical potentials. Levin and Greenblatt,
FOIS A, GIBBS EL, GIBBS FA. Bilaterally Independent Sleep Patterns in Hydrocephalus. AMA Arch NeurPsych. 1958;79(3):264–268. doi:10.1001/archneurpsyc.1958.02340030028003
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