Quality of hearing preservation in acoustic neuroma surgery

Objective: This study aimed to investigate the factors affecting the qualit y of postoperative hearing in acoustic neuroma. Study Design: The study was designed as a retrospective case review. Setting: The study was performed at the Department of Otolaryngology, Schoo l of Medicine, Keio University, Tokyo, Japan. Patients: The subjects were 94 patients with unilateral acoustic neuroma. Intervention: Hearing preservation surgery was performed in the subjects vi a the extended cranial fossa approach or the middle cranial fossa approach. Main Outcome Measures: The outcome measures included patient's age and gend er, hearing level, speech discrimination score, tumor size, and surgical ap proach. The relationship between the qualities of preoperative and postoper ative hearing and the lone-term prognosis of preserved hearing also was inv estigated. Results: In 94 subjects, there were 47 patients whose hearing was preserved (HP group) and 47 patients whose hearing was not preserved (non-HP group). Overall, hearing preservation rate was 50%. There were no significant diff erences in age, gender, and turner size between the two groups. The hearing preservation rate was significantly higher in patients with an intracanali cular tumor than that with a larger tumor. The better the preoperative qual ity of hearing was, the higher the postoperative one. Although the preserve d hearing deteriorated after surgery in 4 patients, no significant hearing deterioration was observed in the other 43 patients. Conclusions: The results of this study indicated that the diagnosis for aco ustic neuroma in the early stage with serviceable hearing is the most impor tant to improve the quality of postoperative hearing.