title: Glaucoma drainage tube kink after pars plana insertion.
abstract: OBJECTIVE
  To describe focal obstruction of drainage tubes by kinking at the scleral entry site after pars plana insertion.
  
  
  METHODS
  Case study.
  
  
  RESULTS
  Three eyes of three patients underwent uncomplicated placement of a Baerveldt implant into the vitreous cavity at the time of pars plana vitrectomy. Intraocular pressure remained increased after the procedure without evidence of flow. Surgical exploration and modification of the tube placement resulted in immediate intraocular pressure reduction. Compression of the tube at the scleral entry site was confirmed intraoperatively in all eyes by ultrasound biomicroscopy.
  
  
  CONCLUSIONS
  Kinking of the tube at its scleral entry site should be recognized as a possible cause of increased intraocular pressure without bleb formation after pars plana insertion of a glaucoma drainage implant.
authors.affiliation: Department of Ophthalmology, The New York Eye and Ear Infirmary, 310 East 14th St., New York, NY 10003, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Rothman
authors.forename: P A
authors.initials: PA
authors.lastname: Sidoti
authors.forename: R C
authors.initials: RC
authors.lastname: Gentile
authors.forename: J M
authors.initials: JM
authors.lastname: Liebmann
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
authors.forename: R B
authors.initials: RB
authors.lastname: Rosen
authors.forename: R
authors.initials: R
authors.lastname: Ritch
mesh_terms: D001082:Aqueous Humor / Q000378:metabolism; D005901:Glaucoma / Q000601:surgery; D020327:Glaucoma Drainage Implants; D006801:Humans; D007429:Intraocular Pressure; D007431:Intraoperative Complications / Q000000981:diagnostic imaging; D009798:Ocular Hypertension / Q000209:etiology / Q000378:metabolism; D011475:Prosthesis Failure; D012590:Sclera / Q000601:surgery; D013536:Suture Techniques; D014463:Ultrasonography