title: [Clinical features of multiple canal involvement in benign paroxysmal positional vertigo].
abstract: OBJECTIVE
  To describe a series of patients with multiple canal involvement in benign paroxysmal positional vertigo (BPPV), with respect to diagnosis and management.
  
  
  METHODS
  Ninety-five individuals with symptoms of BPPV and positional nystagmus were included in this study. The diagnosis was based on a history of brief episodes of vertigo and the presence of multiple positional nystagmus as confirmed by video-oculographic examination. Patients were treated by means of different particle repositioning manoeuvres according to the affected canal.
  
  
  RESULTS
  Ninety-five patients showed multiple positional nystagmus during the examination corresponding to simultaneous multi-canal BPPV. Fourteen patients (14.7%) had bilateral canal BPPV. Six patients had bilateral posterior canal. Six patients had bilateral horizontal canal, and two patients had bilateral anterior canal. Fifty-three patients (55.8%) had torsional, up-beating nystagmus with down-beating nystagmus, which suggested possible affected both of posterior and anterior canals. Twenty patients (21.1%) had torsional up-beating nystagmus and horizontal direction nystagmus, which suggested possible affected both of posterior and horizontal canals. Five patients had down-beating nystagmus with horizontal nystagmus, which suggested affected both of anterior and horizontal canals. Three patients had torsional up-beating with down-beating and horizontal nystagmus, which suggested possible affected multiple canals. Treatment given to the patients varied according to the canal affected, started with the canal that elicited a strong positional nystagmus and vertigo, and 93.7% (89/95) of patients were symptom free or improved.
  
  
  CONCLUSIONS
  It has been found that multi-canal BPPV is not a rate observation in clinic, and most of them affected posterior and anterior canals. Treatment of multi-canal BPPV can be effective using repositioning maneuver.
authors: Department of Otorhinolaryngology, Beijing Hospital, Beijing 100730, China.
authors: Bo
authors: B
authors: Gao
authors: Wei-ning
authors: WN
authors: Huang
authors: Hai-tao
authors: HT
authors: Song
authors: Li-yi
authors: LY
authors: Wang
authors: Jin-mei
authors: JM
authors: Zhou
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009760:Nystagmus, Physiologic; D010037:Otolithic Membrane; D012665:Semicircular Canals; D014717:Vertigo / Q000175:diagnosis / Q000473:pathology* / Q000628:therapy; D055815:Young Adult