title: Diagnosis and management of lateral semicircular canal benign paroxysmal positional vertigo.
abstract: OBJECTIVE
  Describe the diagnosis, treatment, and outcome of a group of 20 patients with lateral semicircular canal benign paroxysmal positional vertigo (LSC-BPPV).
  
  
  METHODS
  Retrospective review of 20 patients with LSC-BPPV (10 with geotropic and 10 with apogeotropic nystagmus) presenting to a tertiary balance center. Diagnosis was confirmed with infrared nystagmography in Dix-Hallpike positioning tests and supine positional tests. Patients were treated with one or more particle repositioning maneuvers.
  
  
  RESULTS
  Addition of supine positional nystagmus tests to Dix-Hallpike positioning testing improves sensitivity in the diagnosis of LSC-BPPV. Treatment outcomes in the apogeotropic LSC-BPPV group were poorer than the geotropic LSC-BPPV group.
  
  
  CONCLUSIONS
  Adding supine positional testing to routine vestibular diagnostic testing will increase the identification of LSC-BPPV. Apogeotropic LSC-BPPV is more challenging to treat.
authors.affiliation: The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. whitej3@ccf.org
authors.forename: Judith A
authors.initials: JA
authors.lastname: White
authors.forename: Kathleen D
authors.initials: KD
authors.lastname: Coale
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Catalano
authors.forename: John G
authors.initials: JG
authors.lastname: Oas
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002150:Caloric Tests; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010036:Otolaryngology / Q000379:methods*; D011336:Probability; D012189:Retrospective Studies; D018570:Risk Assessment; D012665:Semicircular Canals / Q000503:physiopathology*; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014717:Vertigo / Q000175:diagnosis* / Q000628:therapy*