Upbeat nystagmus after bilateral superior canal plugging: A peripheral cause of vertical nystagmus.
Vertical nystagmus without a torsional component is generally considered a finding indicative of central nervous system pathology. We report two cases of purely upbeat nystagmus elicited with mastoid vibration after bilateral superior canal plugging, to highlight the vestibular pathophysiology involved in this unusual peripheral cause for upbeat nystagmus. Laryngoscope, 127:1698-1700, 2017.
Department of Otolaryngology/Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, U.S.A.
Jeffrey D
JD
Sharon
Department of Otolaryngology/Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, U.S.A.
John P
JP
Carey
Department of Otolaryngology/Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, U.S.A.|Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, Maryland, U.S.A.
Michael C
MC
Schubert
D000161:Acoustic Stimulation; D000328:Adult; D003399:Craniotomy; D004584:Electronystagmography; D005260:Female; D006801:Humans; D007759:Labyrinth Diseases / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D008416:Mastoid / Q000503:physiopathology*; D008875:Middle Aged; D009759:Nystagmus, Pathologic / Q000175:diagnosis / Q000503:physiopathology*; D011183:Postoperative Complications / Q000175:diagnosis / Q000503:physiopathology*; D012438:Saccades / Q000502:physiology; D012665:Semicircular Canals / Q000503:physiopathology* / Q000601:surgery*; D014057:Tomography, X-Ray Computed; D058585:Vestibular Evoked Myogenic Potentials / Q000502:physiology; D014732:Vibration
Upbeat nystagmus; canal dehiscence; oculomotor examination; vestibular