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Objective:A few cases have been reported about hearing impairment after procedures of drainage of cerebrospinal fluid(CSF). In this study, the author discuss the pathogenesis of this complication. Methods:We investigated clinical and radiological findings of eight patients with hearing loss after clipping for ruptured aneurysm. The aneurysm was clipped easily after drainage of CSF for slack brain. The audiologic tests were postoperatively performed. Results:The patients were classified from Hunt-Hess grade II to III and a computerized tomogram showed diffuse subarachnoid hemorrhage(SAH) in both sylvian cisterns and basal cisterns. Angiography revealed that the aneurysm was relatively far from the structures of auditory function. Pure-tone audiome-try revealed unilateral or bilateral hearing loss that not only affected the low, but all frequencies. Complete recovery of hearing was found in five patients at three to six months after operation, whereas partial recovery in two cases and no improvement in one respectively. Conclusion:We speculate that hearing loss following aneurysm surgery results from the drainage of CSF during operation. And it is also possible that a hemolabyrinth caused by an inflow of SAH through cochlear aqucduct could be an additive contributing factor to the induced impaired hearing. Key words:Hearing loss;Aneurysm Surgery;Loss of CSF.