title: Effects of sleep position on time course in remission of positional vertigo in patients with benign paroxysmal positional vertigo.
abstract: CONCLUSIONS
  The findings suggest that it is easy for otoconial debris dislodged from the utricle to fall into the posterior semicircular canal (PSCC) or the horizontal semicircular canal (HSCC) of the undermost ear during sleep, but not to exit from the uppermost ear in patients with benign paroxysmal positional vertigo (BPPV).
  
  
  OBJECTIVE
  The aims of the present study were two-fold. (1) To examine the association between the preferred side of head-lying during sleep and the side of the affected ear in patients with both posterior canal BPPV (P-BPPV) and horizontal canal BPPV (H-BPPV). (2) To see whether that position affects the time course in remission of their positional vertigo.
  
  
  METHODS
  One hundred and sixteen patients with P-BPPV and 40 patients with H-BPPV who showed a habitual preference for right or left side sleeping position were included in this study.
  
  
  RESULTS
  The side of the affected ear was significantly associated with the head-lying side during sleep in patients with P-BPPV and was closely but not significantly associated with it in patients with H-BPPV. However, the head-lying side during sleep did not affect the remission rate of their positional vertigo.
authors.affiliation: Department of Otolaryngology, Yashima General Hospital, Kagawa, Japan. go-sato@pony.ocn.ne.jp
authors.forename: Go
authors.initials: G
authors.lastname: Sato
authors.forename: Kazunori
authors.initials: K
authors.lastname: Sekine
authors.forename: Kazunori
authors.initials: K
authors.lastname: Matsuda
authors.forename: Noriaki
authors.initials: N
authors.lastname: Takeda
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D065635:Benign Paroxysmal Positional Vertigo; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011187:Posture; D012074:Remission Induction / Q000379:methods; D012189:Retrospective Studies; D012890:Sleep; D013997:Time Factors; D016896:Treatment Outcome; D014717:Vertigo / Q000503:physiopathology / Q000628:therapy*; D055815:Young Adult