Table 1.
Demographic and CI-related characteristics of the subjects including etiologies, preoperative audiometry, cochlear parameters, surgical approach, and insertion depth angles.
| Subjects | |
|---|---|
| Number | N = 84 |
| Gender (female/male) | 42/42 |
| Side (left/right) | 38/46 |
| Duration of deafness (years) | Mean ± SD: 12 ± 13 (range: 1–59) |
| Age at implantation (years) | Mean: 65 ± 13 (range: 25–85) |
| Etiologies | |
| Cholesteatoma | n = 0 (0%) |
| Chronic otitis media | n = 6 (7.1%) |
| Familial | n = 4 (4.8%) |
| Infection | n = 3 (3.6%) |
| Medicinal | n = 2 (2.4%) |
| Menière’s disease | n = 8 (9.5%) |
| Meningitis | n = 2 (2.4%) |
| Noise | n = 1 (1.2%) |
| Otosclerosis | n = 0 (0%) |
| Sudden hearing loss | n = 25 (29.8%) |
| Syndromal | n = 3 (3.6%) |
| Trauma | n = 3 (3.6%) |
| Tumor | n = 0 (0%) |
| Unknown | n = 27 (32.1%) |
| Preoperative audiometry | Median ± SD (range) |
| 4FPTA (dB HL) | 82 ± 18 (47–129) |
| PT.125kHz (dB HL) | 58 ± 21 (8–85) |
| PT.25kHz (dB HL) | 63 ± 22 (10–105) |
| PT.5kHz (dB HL) | 71 ± 18 (10–117) |
| PT1kHz (dB HL) | 80 ± 19 (40–140) |
| PT2kHz (dB HL) | 87 ± 25 (55–140) |
| PT4kHz (dB HL) | 94 ± 28 (45–140) |
| PT8kHz (dB HL) | 110 ± 16 (28–110) |
| Monosyllabic score @ 65 dB SPL with HA (%) | 5 ± 18 (0–99) |
| Maximum monosyllabic score WRSmax (%) | 35 ± 26 (0–100) |
| Anatomical data and electrode positioning | |
| Cochlear diameter A (mm) | Mean: 9.0 ± 0.5 (range: 8.0–10.0) |
| Insertion angle most apical electrode (°) | Mean: 380 ± 24.2 (range: 315–425) |
| Insertion angle most basal electrode (°) | Mean: 9.4 ± 5.2 (range: 1–25) |
| Medial-lateral position MP | Mean: 0.62 ± 0.03 (range: 0.53–0.70) |
| Surgical approach | |
| Round window | n = 77 |
| Round window with cochleostomy | n = 7 |