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Related Experiment Videos

Aqueous misdirection after glaucoma drainage device implantation.

D S Greenfield1, C Tello, D L Budenz

  • 1Department of Ophthalmology, The New York Eye and Ear Infirmary, New York, USA.

Ophthalmology
|May 18, 1999
PubMed
Summary

Aqueous misdirection can occur after glaucoma drainage device surgery, often requiring laser or surgical intervention for resolution. Medical therapy alone showed limited success in this case series.

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Area of Science:

  • Ophthalmology
  • Glaucoma Surgery
  • Anterior Segment Surgery

Background:

  • Glaucoma drainage devices (GDDs) are used to manage intraocular pressure.
  • Aqueous misdirection is a rare but serious complication following GDD implantation.

Purpose of the Study:

  • To investigate the clinical presentation, outcomes, and potential mechanisms of aqueous misdirection after GDD implantation.
  • To evaluate the effectiveness of different treatment modalities for this complication.

Main Methods:

  • Retrospective case series of 10 eyes from 9 patients who developed aqueous misdirection after Baerveldt GDD implantation.
  • Data reviewed included clinical presentation, intraocular pressure, anterior chamber depth, and treatment outcomes.
  • Treatments included medical therapy (corticosteroids, cycloplegia, aqueous suppressants), neodymium:YAG (Nd:YAG) hyaloidotomy, and pars plana vitrectomy.

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Main Results:

  • Aqueous misdirection presented with axial anterior chamber shallowing, occurring days to months post-implantation.
  • Initial intraocular pressure was elevated (mean 27.7 mmHg), with a median time to diagnosis of 33.5 days.
  • Medical therapy showed poor response; Nd:YAG hyaloidotomy and pars plana vitrectomy (with or without lensectomy/IOL explantation) were effective in normalizing anterior segment anatomy and lowering IOP (mean final IOP 14.1 mmHg).

Conclusions:

  • Aqueous misdirection is a delayed complication of GDD implantation requiring prompt and often aggressive management.
  • While medical therapy is insufficient, laser and surgical interventions like Nd:YAG hyaloidotomy and pars plana vitrectomy are crucial for successful treatment.