title: Comparison of trabeculectomy with Ex-PRESS miniature glaucoma device implanted under scleral flap.
abstract: OBJECTIVE
  To evaluate the Ex-PRESS miniature implant (Model R 50) placed under partial-thickness scleral flap compared with standard trabeculectomy.
  
  
  METHODS
  In this retrospective comparative series of 100 eyes, we compared 50 eyes in 49 patients treated with the Ex-PRESS miniature glaucoma implant under a scleral flap with 50 matched control eyes in 47 patients treated with trabeculectomy. Success was defined as intraocular pressure (IOP) > or =5 mm Hg and < or =21 mm Hg, with or without glaucoma medications, without further glaucoma surgery or removal of implant. Early postoperative hypotony was defined as IOP <5 mm Hg during the first postoperative week.
  
  
  RESULTS
  The average follow-up was 10.8 months (range 3.5 to 18) for the Ex-PRESS group and 11.2 months (range 3 to 15) for the trabeculectomy group. Although the mean IOP was significantly higher in the early postoperative period in the Ex-PRESS group compared with the trabeculectomy group, the reduction of IOP was similar in both groups after 3 months. The number of postoperative glaucoma medications in both groups was not significantly different. Kaplan-Meier survival curve analysis showed no significant difference in success between the 2 groups (P=0.594). Early postoperative hypotony and choroidal effusion were significantly more frequent after trabeculectomy compared with Ex-PRESS implant under scleral flap (P<0.001).
  
  
  CONCLUSIONS
  The Ex-PRESS implant under a scleral flap had similar IOP-lowering efficacy with a lower rate of early hypotony compared with trabeculectomy.
authors.affiliation: Hamilton Eye Institute, University of Tennessee Health Sciences Center, Memphis, TN 38163, USA.
authors.forename: Peter J G
authors.initials: PJ
authors.lastname: Maris
authors.forename: Kyoko
authors.initials: K
authors.lastname: Ishida
authors.forename: Peter A
authors.initials: PA
authors.lastname: Netland
mesh_terms: D000368:Aged; D000959:Antihypertensive Agents / Q000008:administration & dosage; D005260:Female; D005500:Follow-Up Studies; D005901:Glaucoma / Q000503:physiopathology / Q000601:surgery*; D020327:Glaucoma Drainage Implants; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D019919:Prosthesis Implantation / Q000379:methods; D012189:Retrospective Studies; D012590:Sclera / Q000601:surgery*; D013524:Surgical Flaps; D014065:Tonometry, Ocular; D014130:Trabeculectomy / Q000379:methods*; D016896:Treatment Outcome
chemical_list: D000959:Antihypertensive Agents