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The head shaking nystagmus.

S C Mishra1, S Vrat, A Mishra

  • 1Department of ENT, K. g's Medical College, 226 003 Lucknow.

Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India
|November 3, 2012
PubMed
Summary
This summary is machine-generated.

Head shaking nystagmus (HSN) is a key indicator of vestibular asymmetry. While useful for screening vertigo, its diagnostic accuracy varies, particularly in central vestibular disorders.

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Area of Science:

  • Neurology
  • Ophthalmology
  • Vestibular System Disorders

Background:

  • Vestibular asymmetry is a common cause of vertigo and dysequilibrium.
  • Head shaking nystagmus (HSN) is a clinical sign indicative of vestibular asymmetry.
  • Traditional electro-oculography is not suitable for recording HSN, which is observed using Frenzel's glasses.

Purpose of the Study:

  • To evaluate the diagnostic utility and reliability of head shaking nystagmus (HSN) as a screening tool for vestibular disorders.
  • To determine the validity of HSN in differentiating peripheral and central vestibular lesions.

Main Methods:

  • Clinical observation of nystagmus under Frenzel's glasses following a standardized head-shaking maneuver.
  • Assessment of the direction and characteristics of HSN.
  • Comparison of HSN findings with established diagnoses of peripheral and central vestibular disorders.

Main Results:

  • HSN is characterized by transient, rotatory nystagmus directed away from the lesioned side.
  • The validity of HSN was found to be 49.27% in peripheral vestibular disorders.
  • The validity of HSN was significantly lower in central vestibular disorders, at 14%.

Conclusions:

  • Head shaking nystagmus is a valuable, albeit imperfect, bedside test for screening vestibular asymmetry.
  • HSN demonstrates limited reliability, especially in cases with strong spontaneous nystagmus or elevated intracranial pressure.
  • Further research is needed to refine HSN interpretation and improve its accuracy in diagnosing central vestibular pathologies.