COCHLEAR DYSFUNCTION INDUCED BY ARTERIAL OBSTRUCTION IN THE CAT ANTERIOR CEREBELLAR ARTERY

Abstract

To determine the effects of circulatory disorder on the cochlear function, compound action potentials (AP) were measured in cats with the anterior cerebellar and the labyrinthine arteries occluded. While transitory AP depression followed the anterior cerebellar artery occlusion in approximately one third of the animals, there were no changes in the others. In contrast to this, approximately one third of the animals, there were no changes in the others. In contrast to this, AP disappeared rapidly in all cases with labyrinthine artery occlusion and recoverd only after release of the occlusion in a period of time proportionate to the duration of occlusion. The different ways of response in the two occlusion sites seem to be attributed mainly to a greater chance of collateral circulations in the proximal. In addition, wide range of variance was observe from cat to cat in the effect of the anterior cerebellar artery occlusion and in the recovery following the release of occlusion in the labyrinthine artery, which may be attributed to anatomical variation inherent in the artery system.