title: Benign paroxysmal positional vertigo after surgical drilling of the temporal bone.
abstract: OBJECTIVE
  To present the clinical characteristics of secondary BPPV after surgical drilling of the temporal bone.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  Tertiary referral academic medical center.
  
  
  METHODS
  Ten patients who developed BPPV after surgical procedure of temporal bone drilling were identified from 965 subjects who underwent surgical drilling of the temporal bone at Seoul National University Bundang Hospital. The localization and lateralization of BPPV were based on positional test using video eye movement recording system and videonystagmography.
  
  
  METHODS
  Onset of BPPV after surgery, distributions of involved semicircular canals, response to particle repositioning maneuver and factors that may influence the development of secondary BPPV after surgical drilling of the temporal bone.
  
  
  RESULTS
  Onset of positional vertigo was mostly within 3 days except 1 case (sixth postoperative day). Postoperative BPPV was usually in the contralateral ear in 9 cases (90%), which occurred predominantly on the contralateral horizontal canal in 8 patients (80%). Positional vertigo was resolved after repositioning maneuvers in every case. None of them showed aggravation of bone conduction threshold.
  
  
  CONCLUSIONS
  The incidence of BPPV after surgical drilling of the temporal bone was around 1%, and the horizontal semicircular canal of the contralateral ear was predominantly involved. Head position during surgery (head restriction to contralateral ear down) as well as limitation of head movement due to compressive mastoid bandage after surgery seems to be responsible for such predominance.
authors.affiliation: *Department of Otorhinolaryngology, Hallym University College of Medicine, Kangnam Sacred Heart Hospital, Seoul; †Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam; ‡Department of Otorhinolaryngology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang; and §Department of Neurology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
authors.forename: Su-Kyoung
authors.initials: SK
authors.lastname: Park
authors.forename: So Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Kyu-Hee
authors.initials: KH
authors.lastname: Han
authors.forename: Sung Kwang
authors.initials: SK
authors.lastname: Hong
authors.forename: Ji Soo
authors.initials: JS
authors.lastname: Kim
authors.forename: Ja-Won
authors.initials: JW
authors.lastname: Koo
mesh_terms: D000328:Adult; D000368:Aged; D065635:Benign Paroxysmal Positional Vertigo; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000009:adverse effects*; D056888:Patient Positioning; D012189:Retrospective Studies; D013701:Temporal Bone / Q000601:surgery*; D014717:Vertigo / Q000209:etiology* / Q000628:therapy