Persistent positional nystagmus |
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Authors: | Heidenreich Katherine D Kerber Kevin A Carender Wendy J Basura Gregory J Telian Steven A |
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Institution: | Division of Otology and Neurotology, Department of Otolaryngology-Head and Neck Surgery, Ann Arbor, Michigan 48109-5312, USA. kheidenr@med.umich.edu |
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Abstract: | Involvement of the superior semicircular canal (SSC) in benign paroxysmal positional vertigo (BPPV) is rare. SSC BPPV is distinguished from the more common posterior semicircular canal (PSC) variant by the pattern of nystagmus triggered by the Dix-Hallpike position: down-beating torsional nystagmus in SSC BPPV versus up-beating torsional nystagmus in PSC BPPV. SSC BPPV may be readily treated at the bedside, which is a key component in excluding central causes of down-beating nystagmus. We present an unusual video case report believed to represent refractory SSC BPPV based on the pattern of nystagmus and the absence of any other central signs. |
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Keywords: | Benign paroxysmal positional vertigo semicircular canal superior anterior nystagmus cupulolithiasis |
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