title: Aqueous tube shunt to a preexisting episcleral encircling element in the treatment of complicated glaucomas.
abstract: OBJECTIVE
  The treatment of glaucoma after scleral buckling surgery is often problematic. The authors investigated a series of patients in whom a silicone tube was implanted to shunt aqueous from the anterior segment to the fibrous capsule surrounding a previously placed silicone episcleral encircling element.
  
  
  METHODS
  Thirteen patients were retrospectively reviewed. In each patient, a silicone tube was inserted through a small incision into the fibrous capsule overlying the scleral explant. In most patients, no attempt was made to secure the distal end of the tube to the silicone band. The proximal end of the tube was inserted into the eye via a needle track.
  
  
  RESULTS
  Successful control of intraocular pressure (IOP) (6 mm Hg < or = final IOP or < 21 mmHg with or without medication) was ultimately achieved in 11 (85%) of 13 patients (3 of the successful patients underwent one or more surgical revisions to relieve obstruction of the proximal and/or distal tube opening). Follow-up in these patients ranged from 8 to 49 months (mean +/- standard deviation, 21.7 +/- 14.1 months). The final postoperative visual acuities were within one line of the preoperative visual acuities or had improved in 11 (85%) patients. Complications included serous choroidal detachment (3 patients; 23%), conjunctival wound leak (2 patients; 15%), hyphema (1 patient; 8%), and tube obstruction by lens, iris, vitreous, or episcleral fibrous tissue (4 patients; 31%).
  
  
  CONCLUSIONS
  Aqueous tube shunt to a pre-existing episcleral encircling element is useful in treating complicated glaucomas after scleral buckling surgery. Fibrous obstruction of the external tube opening is a frequent complication in the early postoperative period, but it may be relieved by surgical revision.
authors.affiliation: Department of Ophthalmology, University of Southern California School of Medicine.
authors.forename: P A
authors.initials: PA
authors.lastname: Sidoti
authors.forename: D S
authors.initials: DS
authors.lastname: Minckler
authors.forename: G
authors.initials: G
authors.lastname: Baerveldt
authors.forename: P P
authors.initials: PP
authors.lastname: Lee
authors.forename: D K
authors.initials: DK
authors.lastname: Heuer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000869:Anterior Eye Segment / Q000601:surgery; D001082:Aqueous Humor / Q000378:metabolism*; D004322:Drainage / Q000379:methods*; D005500:Follow-Up Studies; D005901:Glaucoma / Q000601:surgery*; D006801:Humans; D007429:Intraocular Pressure; D008875:Middle Aged; D011183:Postoperative Complications; D019736:Prostheses and Implants; D012086:Reoperation; D012163:Retinal Detachment / Q000601:surgery; D012590:Sclera / Q000601:surgery; D012591:Scleral Buckling; D012826:Silicone Elastomers; D014792:Visual Acuity
chemical_list: D012826:Silicone Elastomers