DOES INTRACOCHLEAR IMPLANTATION JEOPARDIZE VESTIBULAR FUNCTION

We present the results of the vestibular function tests of 35 patients who were selected for cochlear implantation. Vestibular function was evaluated with a caloric test and a velocity step test. The preimplant data were compared to those in previously reported series. Intracochl ear implantation was performed in 25 patients. The vestibular complica tions encountered in this group are presented and discussed. Six patie nts had normal or residual (but substantial) vestibular function in th e ear eligible for implantation. Vestibular function was preserved in 3 patients and was lost in 3 patients, in 1 case through an iatrogenic cause. We estimate the risk of losing vestibular function as a result of intracochlear implantation as between 50% and 60% on the basis of the present and previously reported data.