Author/Editor     Butinar, Dušan; Gros, Anton; Vatovec, Jagoda
Title     Električno izvabljeni slušni potenciali možganskega debla pri kandidatih za polžkov vsadek
Translated title     Electrically evoked auditory brain-stem responses in candidates for cochlear implants
Type     članek
Source     In: Zbornik referatov 2. slovenskega posveta o rehabilitaciji oseb s polževim vsadkom; 2002 nov 8-9; Maribor. Maribor: Center za sluh in govor,
Publication year     2002
Volume     str. 39-43
Language     slo
Abstract     Electrocochleography (EcochG) and electrically evoked auditory brain-stem responses (EABR) are used for electrophysiological assessment of children, candidates for cochlear implants. Both examinations provide an objective measure of the inner ear cell damage and of the auditory nerve fibres preservation. The latter is a prerequisite for a successful cochlear implantation. We have tested 51 candidates, 23 females, 28 males, aged 1.5-62 years, in the operating room under general anaesthesia and museular relaxation. 100 micro s alternating click stimuli were delivered via the headphones to each ear. EcochG were recorded with a needle electrode on the promontory and with a surface electrode on the vertex. EABR were elicited with stimuli consisting of 200 micro s inverted biphasic current pulses with the intensity increasing from 600 microA to 1 mA, provided by a transtympanically placed promontory needle electrode and recorded with surface electrodes on the vertex and contralateral earlobe. The ground electrode was placed to the ipsilateral mastoid. We were able to record the EcohG and cochlear microphonics (CM) in 3 patients. EABR were obtained in 36 out of 51 examined candidates (71%), from both ears in 16 (32%) and from one ear only in 20 (39%) of them. The mean EABR threshold was 733 microA (SD = 115.5), mean wave eNV latency at the threshold was 4.8 ms, and the mean wave eNV amplitude 0.125 microV. The ear with the higher EABR amplitude and the lower threshold was chosen for implantation. Key words: electrocochleography, electrically evoked auditory brainstem responses, cochlear implants
Descriptors     DEAFNESS
EVOKED POTENTIALS, AUDITORY, BRAIN STEM
COCHLEAR IMPLANT
AUDIOMETRY, EVOKED RESPONSE
PREOPERATIVE CARE