title: [Clinical features and therapy of subjective benign paroxysmal positional vertigo].
abstract: OBJECTIVE
  To evaluate the clinical features and therapy of subjective benign paroxysmal positional vertigo (S-BPPV).
  
  
  METHODS
  By retrospectively analyzing the results of clinical features and therapy in 12 patients with S-BPPV from January 2003 to September 2006, the results were compared with 24 patients with objective benign paroxysmal positional vertigo (O-BPPV) of posterior semicircular canal.
  
  
  RESULTS
  S-BPPV patients suffered from attack of transient vertigo with sudden onset triggered by head motion but no concomitant nystagmus in Dix-Hallpike test. The latency and duration of vertigo attack were (4.42 +/- 2.02) s and (8.67 +/- 4.31) s in S-BPPV, (3.2 +/- 1.18) s and (14.75 +/- 4.97) s in O-BPPV of posterior semicircular canal. The differences between the two groups were all significant (t = 2.30, P < 0.05 and t = 3.61, P < 0.01). The symptoms disappeared in 11 patients after a single therapy of particular repositioning maneuver and 1 patient after 2 times therapy in S-BPPV. The one-stage success rate was 91.7% in S-BPPV and 79.2% in O-BPPV of posterior semicircular canal, but the difference between these two groups was not significant. The number of circulation therapy in first management was (1.75 +/- 1.08) times in S-BPPV and (3.38 +/- 1.06) times in O-BPPV of posterior semicircular canal, while the difference was significant (t = 4.32, P < 0.01). There were 2 patients recurred during follow-up in S-BPPV and 7 patients in O-BPPV of posterior semicircular canal, but the difference wasn't significant.
  
  
  CONCLUSIONS
  Longer latency, shorter duration and need less circulation therapy are achieved in S-BPPV compared with O-BPPV of posterior semicircular canal, which indicate that the effectiveness of S-BPPV seems to be more favorable than that of O-BPPV of posterior semicircular canal.
authors.affiliation: Department of Neurology, Changzheng Hospital, Shanghai 200003, China.
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Zhong-Xin
authors.initials: ZX
authors.lastname: Zhao
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Hui
authors.initials: H
authors.lastname: Zhou
authors.forename: Wen-Zhao
authors.initials: WZ
authors.lastname: Wang
authors.forename: Guo-Hong
authors.initials: GH
authors.lastname: Tian
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012665:Semicircular Canals / Q000503:physiopathology; D016896:Treatment Outcome; D014717:Vertigo / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy*; D055815:Young Adult