title: Comparison of double-plate Molteno and Ahmed glaucoma valve in patients with advanced uncontrolled glaucoma.
abstract: OBJECTIVE
  To compare double-plate Molteno (DPM) with the Ahmed glaucoma valve (AGV) in the treatment of eyes with complicated glaucoma.
  
  
  METHODS
  This matched, retrospective, case-control study was based on diagnosis, number of previous operations, and age. There were 30 patients in each group and only patients with a minimum of 6 months follow up were included. Double-plate Molteno or Ahmed glaucoma valve insertion was performed on each patient to control intractable glaucoma. Success was defined as IOP <22 mm Hg and >4 mm Hg on the last two visits, a decrease of no more than 2 lines in the visual acuity, and no additional surgical intervention to control IOP.
  
  
  RESULTS
  The Kaplan-Meier estimated probability of success at 12 and 24 months was 73% and 56% with DPM and 60% and 50% for AGV (P = 0.72). Mean IOP measured 13.36 +/- 5.2 mm Hg following DPM and 16.7 +/- 5.6 mm Hg following AGV at 12 months (P = 0.026) and 13.3 +/- 5.1 mm Hg with DPM and 19 +/- 5.8 mm Hg with AGV at 24 months (P = 0.009). Of the patients involved in the study, 83.5% exhibited hypertensive phase (HP) of AGV vs 43.5% of DPM (P = 0.04). AGV had a tendency to fail earlier (5 months +/- 7 following AGV vs 13 months +/- 13 following DPM, P = 0.07, t-test). Patients with either a second valve insertion or valve removal were 7/30 of AGV vs 1/30 in DPM (P = 0.05). Stent removal was needed by 10/30 DPM and 8/30 AGV had needling/5-FU.
  
  
  CONCLUSIONS
  The percentage of patients free from failure was similar between the two groups at 36 months. DPM is associated with lower mean IOP in the long term compared to AGV.
authors.affiliation: Department of Ophthalmology, Tulane University Health Sciences Center, School of Medicine, New Orleans, Louisiana, USA.
authors.forename: Ramesh S
authors.initials: RS
authors.lastname: Ayyala
authors.forename: David
authors.initials: D
authors.lastname: Zurakowski
authors.forename: R
authors.initials: R
authors.lastname: Monshizadeh
authors.forename: Chian-Huey
authors.initials: CH
authors.lastname: Hong
authors.forename: David
authors.initials: D
authors.lastname: Richards
authors.forename: William E
authors.initials: WE
authors.lastname: Layden
authors.forename: B T
authors.initials: BT
authors.lastname: Hutchinson
authors.forename: A R
authors.initials: AR
authors.lastname: Bellows
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000869:Anterior Eye Segment / Q000601:surgery*; D005260:Female; D005901:Glaucoma / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D018465:Molteno Implants; D011183:Postoperative Complications; D019919:Prosthesis Implantation; D016896:Treatment Outcome; D014792:Visual Acuity