Canal switch after canalith repositioning procedure for benign paroxysmal positional vertigo

Authors

  • Giant C. Lin MD,

    1. Division of Otology and Neurotology, Department of Otolaryngology–Head and Neck Surgery, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
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  • Gregory J. Basura MD, PhD,

    1. Division of Otology and Neurotology, Department of Otolaryngology–Head and Neck Surgery, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
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  • Hiu Tung Wong,

    1. Division of Otology and Neurotology, Department of Otolaryngology–Head and Neck Surgery, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
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  • Katherine D. Heidenreich MD

    Corresponding author
    1. Division of Otology and Neurotology, Department of Otolaryngology–Head and Neck Surgery, University of Michigan Health System, Ann Arbor, Michigan, U.S.A.
    • Department of Otolaryngology–Head and Neck Surgery, 1904 Taubman Center, 1500 E. Medical Center Drive, Ann Arbor, MI 48109
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  • The authors have no funding, financial relationships, or conflicts of interest to disclose.

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. Laryngoscope, 2012

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