title: Hypertensive Phase Following Silicone Plate Ahmed Glaucoma Valve Implantation.
abstract: OBJECTIVE
  To estimate the incidence of hypertensive phase (HP) following silicone plate Ahmed glaucoma valve implantation and to explore the risk factors for developing HP.
  
  
  METHODS
  A total of 325 eyes from 325 patients who underwent Ahmed glaucoma valve implantation for uncontrolled intraocular pressure (IOP) and were followed for at least 1 year were included. The HP was defined as IOP>21 mm Hg (with or without IOP-lowering medication) during the first 3 months after surgery. Eyes were divided into HP and non-HP development groups. Overall success was defined as reaching an IOP>5 and <22 mm Hg with (qualified success) or without (complete success) use of an IOP-lowering medication. Risk factors associated with HP development were determined by logistic regression analysis.
  
  
  RESULTS
  Among 325 eyes, 101 eyes (31.1%) experienced HP. For 24 eyes (23.8%), HP had not resolved by postoperative year 1. The HP group showed a significantly higher mean preoperative IOP than the non-HP group (37.1 ± 11.4 vs. 32.3 ± 11.2 mm Hg, P=0.004). The overall success rate was not significantly different between groups (81.2%, HP group vs. 89.7%, non-HP group; P=0.111); however, the complete success rate was significantly higher in the non-HP group (26.7% vs. 43.3%, P=0.003) at postoperative year 1. HP development was positively associated with preoperative IOP (odds ratio, 1.025; P=0.023).
  
  
  CONCLUSIONS
  Higher preoperative IOP was associated with the HP development. The non-HP group achieved a higher complete success rate when assessed at postoperative year 1.
authors.affiliation: Department of Ophthalmology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea.
authors.forename: Hun Jae
authors.initials: HJ
authors.lastname: Won
authors.forename: Kyung Rim
authors.initials: KR
authors.lastname: Sung
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D020327:Glaucoma Drainage Implants; D005902:Glaucoma, Open-Angle / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000209:etiology* / Q000503:physiopathology; D019919:Prosthesis Implantation / Q000009:adverse effects*; D012189:Retrospective Studies; D012307:Risk Factors; D014065:Tonometry, Ocular; D016896:Treatment Outcome