Association Between Body Mass Index and Complications in Acoustic Neuroma Surgery.

OBJECTIVES: Elevated body mass index (BMI) is a risk factor for surgical complications, but data in acoustic neuroma surgery are conflicting and limited to small single-institution studies. This work evaluates associations between BMI and complications in surgery for acoustic neuroma (AN).

STUDY DESIGN: Retrospective review.

SETTING: Two tertiary otology referral institutions.

SUBJECTS AND METHODS: Patients undergoing surgery for AN. Univariate and multivariate analysis of association between BMI and complications was performed using two-tailed t tests and binary logistic regression.

RESULTS: BMI ranged from 18.0 kg/m2 to 63.9 kg/m2 with mean of 29.2 kg/m2 among 362 included patients. High BMI was associated with increased risk of cerebrospinal fluid (CSF) leak ( p = 0.003) and need for revision surgery within 6 months ( p = 0.03). CSF leak occurred in 11.6% of obese patients (BMI ≥ 30.0) and 5.1% of patients with BMI < 30.0. There was no association between BMI and post-operative intracranial hemorrhage, wound infection, or incomplete resection ( p > 0.05). Multivariate analysis revealed BMI was associated with CSF leak (odds ratio 1.11 per BMI point, p = 0.002) and need for revision surgery (odds ratio 1.07 per BMI point, p = 0.02) independent of age, gender, tumor size, or surgical approach.

CONCLUSIONS: The largest series to date investigating BMI in acoustic surgery is presented. Elevated BMI is strongly associated with CSF leak and need for revision surgery but not with other complications. Obese or overweight patients undergoing acoustic neuroma resection should be counseled of their increased risk of CSF leak.