[Evoked potentials in the rehabilitation of the patients after cochlear implantation].

The objective methods for the hearing examination of the patients after cochlear implantation provide an important tool for the speech processor fitting. The aim of the present study was to evaluate the possibilities and the informative value of the electrically evoked compound action potential (ECAP) and electrically evoked auditory brainstem response (EABR) combined recording technique. For this reason, the comparison of the ECAP and EABR thresholds with comfortable levels of stimulation, obtained on the basis of subjective response and psychophysical testing of the patients with good results after cochlear implantation was performed.

[Long-term adaptation of the patients to electrical stimulation in the course of rehabilitation following cochlear implantation].

The objective of the present work was to study long-term adaptation of the patients to electrical stimulation in the course of rehabilitation following cochlear implantation. The following parameters were determined: variations of threshold auditory sensation of electrical stimulation (ESS), alteration of the maximum electrical stimulation comfort level (MCL), changes in the dynamic range (DR) of the stimulus and changes in the threshold auditory nerve action potentials (ANAP). The observations on ESS dynamics and DR of the stimulus were collected during 2 years after the first connection of the processor in a group of 27 patients.

[Contralateral electrically evoked reflex of the musculus stapedius in patients with cochlear implant].

Registration of electrically evoked reflex is widely applied in rehabilitation of patients by cochlear implantation. As a rule, visual assessment of the ipsilateral reflex is made intraoperatively for functional evaluation of surgical results. Of interest is use of contralateral electrically evoked reflex of the musculus stapedius in the course of adjustment of the speech processor.

Effect of stimulation parameters on electrically evoked auditory brainstem responses.

It is evident that the conventional technique for cochlear implant adjustment is not suitable for children in their first years of life. In order to find a solution to this problem, the possibility of electrically evoked auditory brainstem response (EABR) recording was investigated. EABRs were recorded in 9 patients with the Nucleus multichannel cochlear implant.