Table 2:
Intraoperative and Postoperative features found in cases of near dehiscence (ND) of the superior canal versus frank superior canal dehiscence (SCD)
| ND (16 patients; 17 ears) | frank SCD (34 patients; 34 ears) | p value | |
|---|---|---|---|
| Intraoperative | |||
| Length of Dehiscence (mm) | N/A | 4.2 | |
| Plugged and resurfaced (%) | 13 (76) | 34 (100) | |
| Resurfaced only (%) | 4 (24) | 0 (0) | |
| Prevalence of persistent/worse postoperative auditory symptoms | |||
| Tinnitus (%) | 5 (29) | 4 (12) | 0.14 |
| Autophony (%) | 3 (18) | 2 (6) | 0.32 |
| Aural fullness (%) | 1 (8) | 3 (9) | 1.0 |
| Any auditory symptoms (%) | 7 (41) | 6 (18) | 0.09 |
| Prevalence of persistent/worse postoperative vestibular symptoms | |||
| Vertigo (%) | 1 (6) | 4 (12) | 0.65 |
| BPPV*1 (%) | 0 (0) | 4 (12) | 0.29 |
| Vestibular hypofunction*2 (%) | 3 (18) | 13 (38) | 0.20 |
| Any vestibular symptoms (%) | 5 (29) | 16 (47) | 0.37 |
| Other Conditions | |||
| Posterior SCC impairment (%) | 2 (12) | 7 (21) | 0.70 |
| Facial nerve paresis (%) | 2 (12) | 0 (0) | 0.12 |
| Physiologic findings | |||
| cVEMP median threshold | 85 (75-97.5, n=4) | 95 (92.5-102.5, n=12) | 0.17 |
| dB nHL (IQR) | |||
| [normal: 100 (90-105)] | |||
| oVEMP tone median amplitude | 2.1 (0.9-5.7, n=6) | 2.2 (1.6-3.5, n=23) | 0.85 |
| μV (IQR) | |||
| [normal: 3.7 (2.8-6.9)]] | |||
| Median low frequency ABG | 7.5 (5-12.5, n=17) | 6.3 (3.8-12.5, n=34) | 0.73 |
| dB (IQR) | |||
| Median PTA, dB (IQR) | 12.5 (8.8-20, n=17) | 10.0 (6.2-20, n=34) | 0.41 |
Significantly different values in cases with ND compared to those with frank SCD are denoted in bold letters with the corresponding p values from the Spearman correlations. Physiologic findings from ND and SCD patients as well as normal values included for reference are medians ± interquartile ranges (IQRs)2.
*1
(BPPV) Benign paroxysmal positional vertigo.
*2
Temporary impairment of all semicircular canals on the side of surgery as determined by clinical head impulse testing after surgery.