TABLE 1.
Demographic, audiologic, and 3-D CT reconstruction data for all 48 patients who met inclusion criteria and underwent cochlear implantation with multifrequency ECochG (250- and 500-Hz acoustic stimulus).
| Electrode array type | Perimodiolar | Lateral wall | |
| Laterality | Right | 18 (52.9) | 7 (50.0) |
| Left | 16 (47.1) | 7 (50.0) | |
| Age (years) | 68.1 ± 15.9 | 68.5 ± 13.7 | |
| Etiology | Idiopathic | 19 (55.9) | 7 (50.0) |
| Presbycusis | 0 | 2 (14.3) | |
| Noise Induced | 6 (17.6) | 2 (14.3) | |
| Sudden Sensorineural | 1 (2.9) | 2 (14.3) | |
| Meniere’s | 1 (2.9) | 0 | |
| Autoimmune | 2 (5.9) | 0 | |
| Congenital | 4 (11.9) | 1 (7.1) | |
| Infectious | 0 | 0 | |
| Trauma | 1 (2.9) | 0 | |
| Duration of Hearing Loss (years) | 24.4 ± 18.3 | 23.6 ± 16.2 | |
| Duration of Severe-to-Profound Hearing Loss (years) | 7.6 ± 12.3 | 4.6 ± 4.3 | |
| Audiologic Thresholds | |||
| Preoperative Low-Frequency Pure Tone Average (LFPTA; 125, 250, and 500-Hz; dB HL) | 59.4 ± 22.8 | 48.1 ± 11.4 | |
| Postoperative LFPTA (dB HL) | 92.9 ± 23.7 | 99.1 ± 20.1 | |
| LFPTA Shift (dB HL) | 33.6 ± 22.7 | 51.0 ± 19.4 | |
| CT 3-D Reconstructions | |||
| Basal Electrode Insertion Angle (deg) | 19.7 ± 13.0 | 0.8 ± 5.2 | |
| Apical Electrode Insertion Angle (deg) | 396.5 ± 40.2 | 294.1 ± 41.9 | |
| 1st Turn Outer Wall Length (mm) | 22.5 ± 1.2 | 23.2 ± 1.3 | |
| Cochlear Diameter Center to Round Window (mm) | 9.2 ± 0.4 | 9.4 ± 0.6 | |
| Cochlear Diameter Orthogonal to Round Window | 7.1 ± 0.4 | 13.2 ± 0.4 | |