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The active head-impulse test in unilateral peripheral vestibulopathy
Ross A Black1, G Michael Halmagyi, Matthew J Thurtell
1Department of Neurology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Sydney, Australia. rossb@icn.usyd.edu.au
Archives of Neurology
|February 16, 2005
Summary
The passive head-impulse test is crucial for diagnosing severe unilateral peripheral vestibulopathy. Active head-impulse tests may yield false-negative results, making them unreliable for this diagnosis.
Area of Science:
- Neurology
- Ophthalmology
- Vestibular System
Background:
- The head-impulse test is a standard neurological examination for detecting unilateral peripheral vestibulopathy.
- It is particularly important for patients experiencing vertigo and balance disorders.
Purpose of the Study:
- To compare the diagnostic utility of the active head-impulse test (patient-initiated head rotation) with the standard passive head-impulse test (clinician-initiated).
Main Methods:
- Clinical observation of compensatory saccades.
- Search coil measurement of compensatory eye rotations.
- Comparison of active versus passive horizontal head-impulses in 6 patients with unilateral vestibular deafferentation.
Main Results:
- Passive head-impulses revealed expected compensatory saccades towards the lesion side.
- Active head-impulses did not show these saccades.
- Search coil data indicated higher vestibulo-ocular reflex gain and shorter saccade latency during active head-impulses, resulting in 'occult' saccades.
Conclusions:
- Passive head-impulses are essential for accurately diagnosing severe unilateral peripheral vestibulopathy.
- Active head-impulses can lead to false-negative results and should not be relied upon for this diagnosis.