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[Vertical nystagmus induced by the head-shaking test: 10 cases]
L Califano1, P G Capparuccia, A Bojano
1Azienda Ospedaliera G. Rummo, U.O. di Otorinolaringoiatria, Benevento.
Summary
A new vertical type of Head-Shaking test-induced Nystagmus (H.S.-Ny) was identified in patients with vestibular asymmetry. This vertical H.S.-Ny is a crucial indicator for diagnosing central nervous system pathologies.
Area of Science:
- Neurology
- Ophthalmology
- Oto-rhino-laryngology
Background:
- The Head-Shaking test-induced Nystagmus (H.S.-Ny) is used to assess vestibular system asymmetry.
- Four types of horizontal H.S.-Ny are known, but none are specific to the location of vestibular pathology.
Observation:
- A rare, low-amplitude vertical H.S.-Ny was observed in 13 out of 1500 tested cases.
- This vertical nystagmus was frequently associated with other vestibular signs.
Findings:
- Vertical H.S.-Ny was linked to central pathologies, including N.M.R.-confirmed cases and complications from epidemic parotitis.
- In some instances, vertical H.S.-Ny was present without confirmed organic pathology.
Implications:
- Vertical H.S.-Ny serves as a simple, significant diagnostic marker for central, tronco-encephalic, and cerebellar pathologies.
- This finding may enhance the diagnostic capabilities for central vestibular disorders.