Consequences to hearing during the conservative management of vestibular schwannomas.

摘要: Objective: To estimate the risk of loss serviceable hearing during conservative management vestibular schwannomas. Study Design: Retrospective case review. Methods: Twenty-five patients with a radiological diagnosis unilateral schwannoma were managed conservatively for mean duration 43.8 months (range, 12–194 mo). The pure-tone average (PTA) (0.5, 1, 2, and 3 kHz) speech discrimination scores (SDS) measured at regular intervals throughout entire follow-up. Serviceable was defined using two criteria: 70% SDS/30 dB PTA (the 70/30 rule) 50% SDS/50 50/50 rule). size growth rate tumors determined according to American Academy Otolaryngology—Head Neck Surgery guidelines (1995). Intervention recommended if there evidence continuous or rapid tumor growth, and/or increasing symptoms signs suggestive growth. Results: total group 43% rule 42% rule. Tumor considered significant (> 1 mm) in 8 (32%) nonsignificant 17 (68%). tumor-growth 67% 80% In contrast, no tumor–growth 25% 14% No audiological factors predictive identified. Conclusions: There is schwannomas. This appears be greater that demonstrate growth.