Abstract
Under nitrous oxide-oxygen-ether anes thes is the transtympanic membranous labyrinthotomies were carried out for the relief of recurrent attacks of vertigo in two patients of in the end stage of Meniere's disease.
Electroencephalogram (leads in the left or right temporal and in the left or right parietal areas), electronystagmogram (leads in the outer canthi of the eyes), plethysmogram, galvanic skin reaction, electrocardiogram, respiration were simultaneously recorded with an 8-channel electroencephalograh.
The results obtained were as follows :
1. Patterns of the quick ocular movement and vestibular nystagmus produced by labyrinthine sti mulations were modified in their forms dur inggeneral anesthesia, and vestibular ocular movements produced by stimulating the labyrinth or unilateral labyrinthotomy were observed in relatively deep general anesthesia.
2. An imate relationship between the depth of anesthesia and ocular movements was recognized and this fact shows the ocular movements can be utilized as one of the indicators to show the depth of anesthesia.
3. Vestibulo-vegetative reflexes were already suppressed in the early stage of general anesthesia.
Vestibular influences upon various body activi. ties such as electroencephalogrm, eye-movement, galvanic skin reflex, plethysmogram, electrocardiogram and respiration were discussed.
