How to perform the skull vibration-induced nystagmus test (SVINT) - 26/10/16
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Abstract |
The skull vibration-induced nystagmus test is a robust, nonintrusive and easy to perform test. This test acts as a vestibular Weber test and is performed as a bedside examination. It usually instantaneously reveals vibration-induced nystagmus (VIN) even in long standing or chronic compensated unilateral vestibular lesions. The test requires stimulation at 30, 60 or more efficiently at 100Hz. The vibrator is applied perpendicularly to the skin on a subject sitting up straight on the right and then the left mastoid (level with external acoustic meatus) and vertex. The VIN can be observed under videonystagmoscopy or Frenzel goggles. Either the direct tracing or the VIN slow phase velocity can be recorded on a 2D or 3D videonystagmograph. The patients should be relaxed and not treated by strong sedative medications. This rapid first-line test is not influenced by vestibular compensation and usefully complements other tests in the multifrequency evaluation of the vestibule. It acts as a global vestibular test by stimulating both canal and otolithic structures at 100Hz. It is useful in case of external acoustic meatus or middle ear disease as a substitute for the water caloric test and is preferable in elderly patients with vascular disease or arthritis of the neck to the head-shaking-test or head-impulse-test.
Le texte complet de cet article est disponible en PDF.Keywords : Skull vibration, Nystagmus, Vestibule, High frequencies, Weber test
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☆ | The skull vibration-induced nystagmus test (SVINT) was the subject of a PhD thesis entitled “Influence of vibratory stimulations applied to skull and cervical muscles on equilibrium function. Physiological interpretations and applications in pathology. Development and validation of a new vestibular test: the SVINT or Dumas test” presented at university of Lorraine (Nancy) 18 September 2014. |
Vol 133 - N° 5
P. 343-348 - novembre 2016 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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