Document Detail

Differential diagnosis of true and pseudo-bilateral benign positional nystagmus.
MedLine Citation:
PMID:  17851906     Owner:  NLM     Status:  MEDLINE    
CONCLUSIONS: Two patients showing two rotational axes of their positional nystagmus had canalolithiasis in bilateral posterior semicircular canals (PSCCs), leading to the diagnosis of true bilateral benign paroxysmal positional nystagmus (P-BPPN). Another 18 patients had a single rotation axis of their positional nystagmus with short time constant (TC) on one side and long TC on the other. Since canalolithiasis in the uppermost PSCC may be transient cupulolithiasis, evoking positional nystagmus with long TC, the diagnosis of the latter patients should be pseudo-bilateral P-BPPN. OBJECTIVE: To differentiate the true bilateral posterior canal type of P-BPPN from pseudo-bilateral P-BPPN. PATIENTS AND METHODS: The rotational axis and TC of positional nystagmus were three-dimensionally analyzed in 20 patients showing geotropic torsional nystagmus on the left and right Dix-Hallpike (D-H) maneuvers. RESULTS: Two patients showed two rotational axes of their positional nystagmus, which were perpendicular to the plane of the PSCCs. There were no differences in TCs of their positional nystagmus between bilateral D-Hs. Another 18 patients showed a single rotational axis of their positional nystagmus, which was perpendicular to the plane of either the left or right PSCC. TCs of their positional nystagmus were short on one side and long on the other.
Takao Imai; Noriaki Takeda; Go Sato; Kazunori Sekine; Mahito Ito; Koji Nakamae; Takeshi Kubo
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Acta oto-laryngologica     Volume:  128     ISSN:  0001-6489     ISO Abbreviation:  Acta Otolaryngol.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-07-24     Completed Date:  2008-08-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370354     Medline TA:  Acta Otolaryngol     Country:  Norway    
Other Details:
Languages:  eng     Pagination:  151-8     Citation Subset:  IM    
Department of Otolaryngology, Osaka University Graduate School of Medicine, Osaka, Japan.
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MeSH Terms
Aged, 80 and over
Diagnosis, Differential
Image Processing, Computer-Assisted*
Middle Aged
Nystagmus, Physiologic / physiology*
Otolithic Membrane / physiopathology*
Semicircular Canals / physiopathology*
Vestibular Function Tests
Videotape Recording*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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