Audiovestibular Function Deficits in Vestibular Schwannoma

Area of Science:

• Neuroscience
• Otolaryngology
• Medical Diagnostics

Background:

• Vestibular schwannomas (VS) are nerve tumors causing hearing loss, vertigo, and facial palsy.
• Accurate diagnosis and treatment planning rely on audiovestibular testing.
• Understanding the relationship between test results, symptoms, and tumor characteristics is crucial.

Purpose of the Study:

• To systematically review how audiovestibular test parameters correlate with symptoms, tumor size, and location in vestibular schwannomas.
• To explore the diagnostic utility of various tests for VS detection and prognostication.

Main Methods:

• Systematic literature review using Medline.
• Analysis of correlations between audiovestibular test results, clinical symptoms, tumor size, and location.
• Inclusion of data from auditory brainstem response, otoacoustic emissions, caloric and head impulse tests, and vestibular evoked myogenic potentials.

Main Results:

• Auditory brainstem response (ABR) can diagnose retrocochlear lesions from VS.
• Hearing loss in VS may involve cochlear mechanisms beyond retrocochlear compression.
• Advanced MRI and tests like otoacoustic emissions can reveal inner ear changes.
• Caloric/head impulse tests and vestibular evoked myogenic potentials help localize tumors.

Conclusions:

• Preserving audiovestibular function in VS requires controlling tumor growth and preventing inner ear degeneration.
• Comprehensive neurotological evaluation is vital for diagnosing VS of all sizes.
• Detailed testing provides prognostic information for managing vestibular schwannomas.