title: Unilateral posterior canal-plugging surgery for intractable bilateral posterior canal-type benign paroxysmal positional vertigo.
abstract: OBJECTIVE
  To investigate the effectiveness of unilateral posterior semicircular canal (PSCC)-plugging surgery for patients with intractable bilateral PSCC-type benign paroxysmal positional vertigo (P-BPPV).
  
  
  METHODS
  From July 2011 to December 2015, we diagnosed 136 patients with P-BPPV. Of these, 3 patients had bilateral P-BPPV, and in 2 of the 3, the condition had been refractory to conservative treatment for more than 1 year. We planned a staged PSCC-plugging surgery for these 2 patients; initially one side was treated, and the contralateral side was treated 6 months later.
  
  
  RESULTS
  After the first surgery, both patients experienced improvement in symptoms of vertigo and nystagmus on the operated side and no change on the non-operated side. Patients underwent the Epley maneuver for the non-operated side. In one case, the non-operated side was cured. In the other case, although the P-BPPV was not completely resolved, the patient was satisfied with the result of unilateral surgery because he was now able to turn in bed to the operated side without vertigo. Before surgery, he had experienced vertigo when turning even slightly in bed.
  
  
  CONCLUSIONS
  We propose that even unilateral PSCC-plugging surgery is effective for some patients with intractable bilateral P-BPPV.
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Sayaka
authors.initials: S
authors.lastname: Hotta
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan. Electronic address: timai@ent.med.osaka-u.ac.jp.
authors.forename: Takao
authors.initials: T
authors.lastname: Imai
authors.affiliation: Department of Otolaryngology, Suita Municipal Hospital, 2-13-20 Katayama-cho, Suita-shi, Osaka 564-0082, Japan.
authors.forename: Kayoko
authors.initials: K
authors.lastname: Higashi-Shingai
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Suzuyo
authors.initials: S
authors.lastname: Okazaki
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Okumura
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka General Medical Center, 3-1-56 Mandai-higashi, Sumiyoshi-ku, Osaka-shi, Osaka 558-8558, Japan.
authors.forename: Atsuhiko
authors.initials: A
authors.lastname: Uno
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Ohta
authors.affiliation: Department of Otorhinolaryngology, National Hospital Organization Osaka National Hospital, 2-1-14 Houenzaka, Tyuo-ku, Osaka-shi, Osaka 540-0006, Japan.
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Morihana
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sato
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita-shi, Osaka 565-0871, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Inohara
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D065635:Benign Paroxysmal Positional Vertigo / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D009759:Nystagmus, Pathologic / Q000601:surgery; D013506:Otologic Surgical Procedures / Q000379:methods*; D017060:Patient Satisfaction; D012665:Semicircular Canals / Q000601:surgery*; D060205:Therapeutic Occlusion
keywords: Bilateral; Canalolithiasis; Plugging surgery; Rotation vector; Three-dimensional