Persistence of perilymph fistula mechanism in a completely paretic posterior semicircular canal.
The three dimensional eye movements (search coil technique) of a patient with a completely paretic left posterior semicircular canal as a result of a perilymph fistula (PLF) were studied. The patient still exhibited pressure induced nystagmus that obeyed Ewald's first law. This finding cannot be explained by otolith stimulation, but might indicate that PLF mechanisms either persist in canal plugging or act on the ampulla by directly deflecting the cupula.
Helmchen
C
C
Department of Neurology, University of Lübeck, Ratzeburger Allee 160, D-23538 Lübeck, Germany. helmchen_ch@neuro.mu-luebeck.de
Gehrking
E
E
Gottschalk
S
S
Rambold
H
H
D000328:Adult; D003052:Cochlear Aqueduct / Q000473:pathology*; D005402:Fistula / Q000150:complications* / Q000473:pathology*; D006801:Humans; D008297:Male; D017120:Nystagmus, Optokinetic; D015835:Ocular Motility Disorders / Q000209:etiology*; D012665:Semicircular Canals / Q000473:pathology*