title: Risk factors of shallow anterior chamber other than hypotony after Ahmed glaucoma valve implant.
abstract: OBJECTIVE
  To find the risk factors of shallow anterior chamber following hypotony after Ahmed glaucoma valve implant.
  
  
  METHODS
  The retrospective study was carried out with patients who had postoperative intraocular pressure 5 mm Hg or below at 2 consecutive visits after Ahmed glaucoma valve implant surgery. They were divided into 2 groups by the depth of anterior chamber and various factors were compared including age, sex, diabetes, hypertension, glaucoma type, previous intraocular surgery, preoperative visual acuity, refractive error, lens status, corneal thickness, endothelial cell count, axial length, preoperative intraocular pressure, number of preoperative glaucoma medications, use of carbonic anhydrase inhibitor, gonioscopic examination results, and use of ligation suture.
  
  
  RESULTS
  Groups with younger age (P=0.041), myopia (P=0.003), and fewer previous intraocular surgeries (P=0.000) showed higher risk and partial ligation of the tube (P=0.000) showed protective effect of shallow anterior chamber by hypotony after Ahmed valve implant.
  
  
  CONCLUSIONS
  When performing Ahmed glaucoma valve implant surgery in patients with more risk factors of shallow anterior chamber, preventive procedures and proper management can improve the success rate of the implant and reduce its complications.
authors.affiliation: Department of Ophthalmology, Kangnam St Mary's Hospital, College of Medicine, The Catholic University, 505 Banpo-dong, Seocho-gu, Seoul, Korea.
authors.forename: Hae Young
authors.initials: HY
authors.lastname: Park
authors.forename: Na Young
authors.initials: NY
authors.lastname: Lee
authors.forename: Chan Kee
authors.initials: CK
authors.lastname: Park
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D005260:Female; D005901:Glaucoma / Q000601:surgery*; D020327:Glaucoma Drainage Implants / Q000009:adverse effects*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D015814:Ocular Hypotension / Q000209:etiology* / Q000517:prevention & control; D011183:Postoperative Complications; D019919:Prosthesis Implantation; D012189:Retrospective Studies; D012307:Risk Factors; D014065:Tonometry, Ocular