[Vertical nystagmus induced by the head-shaking test: 10 cases].
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.
Califano
L
L
Azienda Ospedaliera G. Rummo, U.O. di Otorinolaringoiatria, Benevento.
Capparuccia
P G
PG
Bojano
A
A
Di Maria
D
D
Villari
G
G
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*
Nistagmo verticale da head-shaking test. Presentazione di dieci casi.