title: Efficacy and safety of the Ahmed glaucoma valve implant in Chinese eyes with complicated glaucoma.
abstract: OBJECTIVE
  To evaluate the efficacy and safety of the Ahmed glaucoma valve implant in Chinese eyes with complicated glaucomas.
  
  
  METHODS
  This retrospective study reviewed the final intraocular pressure, visual outcome, and incidence of complications in all patients with the Ahmed glaucoma valve implant performed at the Prince of Wales Hospital, Hong Kong, between June 1996 and November 1998.
  
  
  RESULTS
  A total of 65 eyes from 60 patients were treated with the Ahmed glaucoma implant. At a mean follow up (SD, median) of 21.8 (9.2, 28. 0) months (range 6-37 months), the mean intraocular pressure was reduced from 37.0 (SD 12.1) mm Hg before the implant surgery to 16.1 (12.4) mm Hg at the last follow up after surgery. The success rate of intraocular pressure control of <22 mm Hg was achieved in 73.8% of operated eyes. Transient postoperative hypotony with shallow anterior chamber occurred in 10.8% of cases. The most common postoperative complication was the formation of encapsulated bleb (24.6%).
  
  
  CONCLUSIONS
  The Ahmed glaucoma valve implant appears to be effective and relatively safe for treating complicated glaucomas in Chinese eyes. The success rate is comparable with those reported in non-Asian eyes. Formation of postoperative encapsulated bleb is, however, more commonly encountered.
authors.affiliation: Department of Ophthalmology and Visual Sciences, the Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, NT, Hong Kong.
authors.forename: J S
authors.initials: JS
authors.lastname: Lai
authors.forename: A S
authors.initials: AS
authors.lastname: Poon
authors.forename: J K
authors.initials: JK
authors.lastname: Chua
authors.forename: C C
authors.initials: CC
authors.lastname: Tham
authors.forename: A T
authors.initials: AT
authors.lastname: Leung
authors.forename: D S
authors.initials: DS
authors.lastname: Lam
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D018463:Filtering Surgery / Q000379:methods*; D005901:Glaucoma / Q000601:surgery*; D020327:Glaucoma Drainage Implants / Q000009:adverse effects; D006801:Humans; D007223:Infant; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity