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The effect of an unilateral cervical sympathetic stimulation on per-rotational nystagmus was investigated in alert rabbits with low, normal and high blood pressure. The cervical sympathetic chain and vagus nerve on one side were cut and the distal part of the cervical sympathetic ganglion (CSG) was stimulated electrically. When a CSG was stimulated, nystagmus towards the stimulated side was suppressed predominantly. As a result, directional preponderance which was directed away from the stimulated side appeared. This effect became obvious when the animal's blood pressure was low. Oxygen partial pressure was recorded in the perilymph of inner ear and cerebellum. Unilateral CSG stimulation predominantly suppressed oxygen tension of stimulated side. This results suggested that the influence of CSG stimulation on the vestibuloocular reflex is considered to be due to aregional ischemia induced by vasoconstriction.

Effects of Cervical Sympathetic Stimulation on Vestibulo-Ocular Reflex of Rabbits with Normal, Low and High Blood Pressure