title: Canal switch after canalith repositioning procedure for benign paroxysmal positional vertigo.
abstract: Canal switch is a complication following canalith repositioning procedure (CRP) for posterior canal benign paroxysmal positional vertigo (BPPV). Instead of being returned to the utricle, the loose otoconia migrate into the superior or horizontal semicircular canal. Patients remain symptomatic, and treatment can be ineffective unless the switch is recognized and additional repositioning maneuvers directed toward the appropriate semicircular canal are performed. This report provides the first videographic documentation of canal switch involving conversion of unilateral posterior semicircular canal BPPV to geotropic horizontal canalithiasis.
authors.affiliation: Division of Otology and Neurotology, Department of Otolaryngology-Head and Neck Surgery, University of Michigan Health System, Ann Arbor, Michigan, USA.
authors.forename: Giant C
authors.initials: GC
authors.lastname: Lin
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Basura
authors.forename: Hiu Tung
authors.initials: HT
authors.lastname: Wong
authors.forename: Katherine D
authors.initials: KD
authors.lastname: Heidenreich
mesh_terms: D000328:Adult; D065635:Benign Paroxysmal Positional Vertigo; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D009759:Nystagmus, Pathologic / Q000175:diagnosis; D010037:Otolithic Membrane / Q000503:physiopathology / Q000601:surgery*; D013506:Otologic Surgical Procedures / Q000009:adverse effects* / Q000379:methods; D018570:Risk Assessment; D012665:Semicircular Canals / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome; D014717:Vertigo / Q000175:diagnosis / Q000601:surgery*; D015837:Vestibular Diseases / Q000175:diagnosis / Q000601:surgery; D014724:Vestibular Function Tests