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A Unified Methodological Framework for Vestibular Schwannoma Research
Published on: June 20, 2017
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Factors Affecting Speech Discrimination After Vestibular Schwannoma Resection
Olivia Kalmanson1, Madeline Olson, Olivia Ovard2
1Department of Otolaryngology-Head and Neck Surgery, The University of Colorado School of Medicine.
Summary
Hearing preservation surgery for vestibular schwannomas (VS) can impact word recognition scores (WRS) and pure tone averages (PTA). Hearing classification systems like AAO-HNS, Gardner-Robertson, and WRSC are comparable for assessing serviceable hearing post-surgery.
Area of Science:
- Neurosurgery
- Audiology
- Otolaryngology
Background:
- Vestibular schwannomas (VS) are tumors that can affect hearing.
- Hearing preservation surgery aims to maintain or improve auditory function.
- Assessing hearing outcomes and classification consistency is crucial after VS surgery.
Purpose of the Study:
- To investigate the relationship between word recognition score (WRS) and pure tone average (PTA) after hearing preservation surgery for VS.
- To evaluate the consistency of different hearing classification systems (AAO-HNS, Gardner-Robertson, WRSC).
Main Methods:
- Retrospective chart review of patients who underwent VS resection with hearing preservation surgery.
- Analysis of pre- and post-operative WRS, PTA, and hearing classifications.
- Inclusion of 75 patients with VS and serviceable hearing.
Main Results:
- Postoperative PTAs spanned the full decibel range; WRS showed a bimodal distribution (>50% or <20%).
- Intraoperative auditory brainstem response (ABR) changes correlated with poorer hearing outcomes and were more likely with higher Koos grade tumors.
- AAO-HNS and Gardner-Robertson classifications were nearly identical; WRSC yielded more class I and fewer class II results.
Conclusions:
- Brainstem effects from larger tumors (Koos 3-4) may impair speech processing, potentially amplified by surgical dissection.
- AAO-HNS, Gardner-Robertson, and WRSC classifications are comparable for describing serviceable hearing in VS patients.
