Tilt table electroencephalography in insufficiency syndromes

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Abstract
In subjects with carotid or basilar insufficiency, rapid tilt alone did not produce eeg changes, due presumably to maintenance of the pre-tilt diastolic pressure during tilt. There was a marked reduction in pulse rate in all subjects of both insufficiency and age-sex matched control groups who showed eeg changes upon unilateral compression without tilt, with the inference that a secondary decrease in unit blood flow to the brain had brought about relative focal or generalized ischemia. Carotid compression plus tilt produced a similar percentage of eeg changes in the insufficiency group and the control.