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Hyperventilation and changes in the electroencephalogram and electroretinogram

From the Indiana University Cardiopulmonary Laboratory, and the USAF Aerospace Medical Research Laboratories, Wright-Patterson Air Force Base, Ohio

SUMMARYTwelve normal subjects, 7 of whom showed slowing of cerebral rhythms during hyperventilation, were semipassively hyperventilated at high respiratory volumes while EEG, ERG, and expiratory CO₂ were being recorded. Eleven subjects showed some increase of the ERG b-wave amplitude, but those with the greatest increase also had the most "slowing" of EEG frequencies. The prolonged ERG b-wave amplitude increase is evidence against the presence of HV-induced hypoxia in the retina and suggests that slowing of cerebral rhythms in HV is also due to factors other than hypoxia.

Dr. Morgan's address is EEG Department, Psychopathic Hospital, 500 Newton Road, University of Iowa Medical Center, Iowa City, Iowa 52240.

Submitted for publication Dec. 24, 1969; accepted Feb. 16, 1970.