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Trabeculectomy function after cataract extraction

P P Chen1, Y K Weaver, D L Budenz

  • 1Department of Ophthalmology, University of Washington, Seattle 98195, USA.

Ophthalmology
|October 27, 1998
PubMed
Summary
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Cataract extraction after trabeculectomy can worsen intraocular pressure (IOP) control, especially in younger patients or those with high preoperative IOP. Most bleb failures occur soon after surgery, and hypotony resolution is unpredictable.

Area of Science:

  • Ophthalmology
  • Glaucoma Surgery
  • Cataract Surgery

Background:

  • Trabeculectomy is a common glaucoma surgery to lower intraocular pressure (IOP).
  • Cataract extraction (CE) is often performed after trabeculectomy in patients with coexisting glaucoma and cataracts.
  • The impact of CE on IOP control after trabeculectomy requires further investigation.

Purpose of the Study:

  • To evaluate the effect of cataract extraction (CE) on intraocular pressure (IOP) control in patients who have previously undergone trabeculectomy.
  • To identify factors associated with loss of IOP control after CE in this patient population.

Main Methods:

  • Retrospective case series of 115 patients undergoing extracapsular or phacoemulsification CE after trabeculectomy.
  • Analysis of preoperative, intraoperative, and postoperative factors.

Related Experiment Videos

  • Kaplan-Meier survival analysis and Cox regression for identifying predictors of IOP control loss.

    • Main Results:

    • 30.4% of eyes required additional medication or bleb needling for IOP control.
    • 9.6% of eyes eventually required further glaucoma surgery.
    • Younger age (≤50 years), higher preoperative IOP (>10 mmHg), intraoperative iris manipulation, and early postoperative peak IOP (>25 mmHg) were associated with worse IOP control.
    • Most bleb failures occurred within 3 months post-CE.
    • Resolution of preoperative hypotony was unpredictable.

    Conclusions:

    • Cataract extraction after trabeculectomy is associated with a risk of worsened IOP control.
    • Key risk factors include patient age, preoperative IOP, intraoperative iris manipulation, and early postoperative IOP.
    • Close monitoring is essential after CE in patients with a history of trabeculectomy, as bleb failures often occur early.