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Related Experiment Videos

Active versus passive head-shaking nystagmus.

Carlos Gimeno-Vilar1, Jorge Rey-Martinez, Nicolas Perez

  • 1Department of Otorhinolaryngology, Clínica Universitaria de Navarra, University Hospital and Medical School, University of Navarra, Pamplona, Spain.

Acta Oto-Laryngologica
|June 19, 2007
PubMed
Summary
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Active and passive head-shaking nystagmus (HSN) tests show similar frequencies for detecting vestibular dysfunction. Performing the active test first is recommended, followed by the passive test if no nystagmus is observed.

Area of Science:

  • Neurology
  • Otolaryngology
  • Vestibular System Function

Background:

  • Head-shaking nystagmus (HSN) is a key indicator of vestibular dysfunction.
  • HSN can be elicited through active (patient-performed) or passive (examiner-performed) head shaking.

Purpose of the Study:

  • To compare the frequency of HSN detected by active (aHSN) versus passive (pHSN) testing.
  • To investigate if age or disease state influences HSN test results.
  • To determine if HSN test methods correlate with other vestibular function tests.

Main Methods:

  • Prospective study involving 100 patients at a tertiary care center.
  • HSN tested actively and passively on the same day as caloric, rotatory chair tests, and disability assessments.
  • HSN defined by duration (>5s) or slow-phase velocity (>3°/s).

Related Experiment Videos

Main Results:

  • Similar frequencies for aHSN (47%) and pHSN (46%) when presence of nystagmus was the criterion.
  • When nystagmus velocity was considered, results agreed in 74% of patients and differed in 26%.
  • Age-dependent nystagmus patterns observed in vestibular neuritis patients, which disappeared when velocity was the criterion.

Conclusions:

  • Active and passive HSN tests yield comparable results for nystagmus detection.
  • Recommend initiating HSN testing actively, then proceeding to passive testing if negative.
  • Discrepancies between active and passive testing may relate to specific vestibular conditions and age.