One hundred and forty-seven adult recipients of the Nucleus 24 cochlear implant system, from 13 different European countries, were tested using neural response telemetry to measure the electrically evoked compound action potential (ECAP), according to a standardised postoperative measurement procedure. Recordings were obtained in 96% of these subjects with this standardised procedure. The group results are presented in terms of peak amplitude and latency, slope of the amplitude growth function and ECAP threshold. The effects of aetiological factors and the duration of deafness on the ECAP were also studied. While large intersubject variability and intrasubject variability (across electrodes) were found, results fell within a consistent pattern and a normative range of peak amplitudes and latencies was established. The aetiological factors had little effect on the ECAP characteristics. However, age affected ECAP amplitude and slope of the amplitude growth function significantly; i.e., the amplitude is higher in the lowest age category (15-30 years). Principal component analysis of the ECAP thresholds shows that the thresholds across 5 electrodes can be described by two factors accounting for 92% of the total variance. The two factors represent the overall level of the threshold profiles ('shift') and their slopes across the electrode array ('tilt'). Correlation between these two factors and the same factors describing the T-and C-levels appeared to be moderate, in the range of 0.5-0.6. AbstractOne hundred and forty-seven adult recipients of the Nucleus ® 24 cochlear implant system, from 13 different European countries, were tested using neural response telemetry to measure the electrically evoked compound action potential (ECAP), according to a standardised postoperative measurement procedure. Recordings were obtained in 96% of these subjects with this standardised procedure. The group results are presented in terms of peak amplitude and latency, slope of the amplitude growth function and ECAP threshold. The effects of aetiological factors and the duration of deafness on the ECAP were also studied. While large intersubject variability and intrasubject variability (across electrodes) were found, results fell within a consistent pattern and a normative range of peak amplitudes and latencies was established. The aetiological factors had little effect on the ECAP characteristics. However, age affected ECAP amplitude and slope of the amplitude growth function significantly; i.e., the amplitude is higher in the lowest age category (15-30 years). Principal component analysis of the ECAP thresholds shows that the thresholds across 5 electrodes can be described by two factors accounting for 92% of the total variance. The two factors represent the overall level of the threshold profiles ('shift') and their slopes across the electrode array ('tilt'). Correlation between these two factors and the same factors describing the T-and C-levels appeared to be moderate, in the range of 0.5-0.6.

The oxymetazoline and 3% NaCl solution groups seemed to be more effective in mucociliary clearance, but there was no significant difference in improvement among the groups. The improvement of acute bacterial rhinosinusitis takes more than 3 weeks, according to the mucociliary clearance values of the groups.

Chronic otitis media (COM) patients who had a multichannel device implanted were evaluated regarding surgical problems and technical modifications. In a multicentric study, implantees whose aetiology was COM were retrospectively evaluated. Patients were operated on and evaluated at three different tertiary referral centres: SSK Izmir Hospital Cochlear Implantation (CI) Center (32 cases), Istanbul Marmara University ENT Clinic (six cases), Eskişehir Anadolu University CI Center (one case). Thirty-nine implantees were evaluated with respect to surgical problems, technical modifications, complications and hearing results. All patients had lost their hearings as a result of COM. Three out of 39 cases were children. Thirty-seven of the patients either had a radical cavity or ear converted to radical at the first stage or concomittantly with the implantation. Patients were evaluated in order to find out the best possible surgical solutions to specific problems caused by COM. In seven cases electrode array disrupted the epithelial lining of the cavity despite specific measures. Five of those cases were re-implanted, passing the electrode array through a tunnel under the facial nerve. Seven recent cases were also implanted with the same subfacial route. In all patients but one, satisfactory hearing results were achieved one to five years after implantation (SDS scores with monosyllabic word list were between 59 and 89 per cent, median 67.4 per cent). CI in COM patients necessitates technical modifications. In radical cavities subfacial implantation seems to be a good solution for the protection of the electrode array.

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