title: [Survey of the use of long-lasting expanding gases in ophthalmology in Japan].
abstract: OBJECTIVE
  To survey the use of long-lasting expanding gases in ophthalmology in Japan.
  
  
  METHODS
  A questionnaire was sent to 1,236 teaching hospitals approved by the Japanese Ophthalmological Society requesting information regarding indications, methods, efficacy and complications related to the use of long-lasting expanding gases administered from January through December 2005.
  
  
  RESULTS
  Four-hundred and fifty-nine hospitals responded to the survey (response rate 37.1%). A total of 174,221 ophthalmic surgeries were performed during the survey period, with long-lasting expanding gases used in 19,816 of cases (11.4%). The surgical procedure was vitrectomy in 89.6% of cases in which gas was administered. The most frequent indication for gas use was rhegmatogenous retinal detachment, for which SF6 was the preferred gas. Industrial use gas was utilized in 76.1% of cases, while 22.4% of cases received medical use gas. Increase in intraocular pressure was the most common complication of intraocular gas tamponade (3121 cases, 15.7%), followed by cataract formation. Ninety-eight percent of ophthalmologists responding supported the use of long-lasting expanding gases with vitrectomy, 85% with scleral buckling procedures, and 84% with surgery to remove subretinal hemorrhage. The consensus was that substantial deterioration of surgical results would occur if long-lasting expanding gases could not be used.
  
  
  CONCLUSIONS
  Long-lasting expanding gases are being widely administered in ophthalmology in Japan, and appear to have good efficacy for a variety of indications. Several complications related to the use of these gases were reported, however the rates of complications were low.
authors.affiliation: Department of Ophthalmology, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8520, Japan. tsakamot@m3.kufm.kagoshima-u.ac.jp
authors.forename: Taiji
authors.initials: T
authors.lastname: Sakamoto
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Hida
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Tano
authors.forename: Akira
authors.initials: A
authors.lastname: Negi
authors.forename: Shinobu
authors.initials: S
authors.lastname: Takeuchi
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Ishibashi
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Inoue
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Ohguro
authors.forename: Annabelle Ayame
authors.initials: AA
authors.lastname: Okada
mesh_terms: D005740:Gases / Q000009:adverse effects; D006801:Humans; D007429:Intraocular Pressure; D007564:Japan / Q000453:epidemiology; D013459:Sulfur Hexafluoride / Q000009:adverse effects; D011795:Surveys and Questionnaires; D014821:Vitrectomy / Q000379:methods* / Q000706:statistics & numerical data*
chemical_list: D005740:Gases; D013459:Sulfur Hexafluoride