Ninty-two patients receiving cochlear implantation showed excellent auditory performance. However, six patients had some kinds of subjective dizziness after surgery. Three patients had recurrent dizziness after surgery. Of these, two patients had paroxymal vertigo after surgery, and one patient had persisting dizziness before and after surgery and also CP. The two patients with paroxymal vertigo had normoresponse in the caloric test before surgery, and hyporesponse in the caloric test after surgery, indicating that cochlear implantation must be the cause of their vertigo. One patient with persisting dizziness before and after surgery attemped suicide. Her dizziness was assumed to be caused by depression and not by the surgery. These results suggest that informed consent is very important before surgery to patients with normo- or hyporesponse in the caloric test or with a mental disease.
