title: [Vertical nystagmus induced by the head-shaking test: 10 cases].
abstract: In cases of central and/or peripheral vestibular system asymmetry, Head-Shaking test-induced Nystagmus (H.S.-Ny) can appear after a cycle of 20 horizontal head oscillations. Four types of H.S.-Ny have been described, all of which are horizontal: 1) deficit Ny; 2) recovery Ny; 3) biphasic Ny; 4) triphasic Ny. None of these forms are specific for any given vestibular asymmetry site, whether central or peripheral. The authors report another low vertical type of H.S.-Ny found in 13 of the 1500 cases where the test was performed. Ten of these cases are discussed here. Vertical H.S.-Ny was found in 7 cases of N.M.R.-confirmed central pathologies, in 1 case of complications from epidemic parotitis and in 2 cases for which N.M.R. did not confirm the presence of an organic pathology. Vertical H.S.-Ny was often associated with other vestibular signs (Gaze-Ny, Rebound Ny, variable direction Ny, down-beat positional Ny, labyrinthine hyper reflexia). The authors consider this form of nystagmus a simple, easily determined signal of great importance in diagnosing the presence of a central, tronco-encephalic and cerebellar pathologies.
authors.affiliation: Azienda Ospedaliera G. Rummo, U.O. di Otorinolaringoiatria, Benevento.
authors.forename: L
authors.initials: L
authors.lastname: Califano
authors.forename: P G
authors.initials: PG
authors.lastname: Capparuccia
authors.forename: A
authors.initials: A
authors.lastname: Bojano
authors.forename: D
authors.initials: D
authors.lastname: Di Maria
authors.forename: G
authors.initials: G
authors.lastname: Villari
mesh_terms: D000328:Adult; D000368:Aged; D001921:Brain / Q000473:pathology; D005260:Female; D006257:Head / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D009759:Nystagmus, Pathologic / Q000175:diagnosis*
vernacular_title: Nistagmo verticale da head-shaking test. Presentazione di dieci casi.