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Head impulse test reveals residual semicircular canal function after vestibular neurectomy
Nadine Lehnen1, Swee T Aw, Michael J Todd
1Department of Neurology, Royal Prince Alfred Hospital, Sydney, Australia. Nadine.Lehnen@campus.lmu.de
Neurology
|June 24, 2004
Summary
Vestibular neurectomy for Meniere disease can cause vertigo if hearing is preserved. Residual posterior semicircular canal function was found in patients experiencing vertigo, suggesting it causes these attacks.
Area of Science:
- Otolaryngology
- Neuroscience
- Vestibular System Research
Background:
- Meniere disease is a disorder of the inner ear.
- Vestibular neurectomy is a surgical option for intractable Meniere disease.
- Some patients experience vertigo after surgery even when hearing is preserved.
Purpose of the Study:
- To investigate the cause of vertiginous Meniere attacks after vestibular neurectomy in hearing-preserving cases.
- To compare semicircular canal function between patients with and without hearing preservation post-surgery.
Main Methods:
- Utilized the three-dimensional head impulse test (3D-HIT).
- Compared postsurgical semicircular canal function in nine hearing-preserving patients with a control group (no hearing preservation).
Main Results:
- Residual posterior semicircular canal function was detected in eight of nine patients with vertigo attacks.
- Control patients (no hearing preservation) showed no residual canal function.
- Vestibular neurectomy preserving hearing may lead to residual ipsilesional vestibular function.
Conclusions:
- Residual vestibular function on the operated side may be the cause of vertiginous Meniere attacks post-surgery.
- Preserving hearing during vestibular neurectomy requires careful consideration of potential residual vestibular function.