Abstract
It is well known that some kinds of vertigo or hearing disturbances are caused by impairment of vertebro-basilar circulation. It is important to determine whether unilateral vertebral artery (VA) occlusion causes an imbalance between bilateral inner ear blood flow. In this study, we investigated the influence of unilateral VA occlusion and hypotension on bilateral inner ear blood flow in rats. Using the microsphere surface methods, we measured blood flow of the cochlea and three semicircular ampullae. In control animals, the differences between blood flow in the right and left cochleae and semicircular ampullae were not significant. In animals with VA occlusion and hypotension, the differences were not significant either. In addition to these findings, we discuss the possibility of imbalance between bilateral inner ear blood flows caused by VA occlusion with consideration of previous reports.
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