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Trabeculectomy and optic nerve head topography.

A Paranhos1, M C Lima, S Salim

  • 1Department of Ophthalmology and Visual Science, Yale University, New Haven, CT, USA. augusto.paranhos@uol.com.br

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 10, 2006
PubMed
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Trabeculectomy surgery can improve optic nerve head parameters, particularly cup volume, in glaucoma patients. The extent of intraocular pressure reduction significantly influences these changes, suggesting potential outcome measures for glaucoma management.

Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Medical Imaging

Background:

  • Glaucoma management requires reliable outcome measures to assess treatment efficacy.
  • Confocal laser tomography provides detailed optic nerve head (ONH) imaging.
  • Trabeculectomy is a common surgical intervention for glaucoma.

Purpose of the Study:

  • To evaluate changes in ONH parameters using confocal laser tomography before and after trabeculectomy.
  • To identify potential outcome measures for glaucoma management based on ONH parameter changes.
  • To correlate ONH parameter changes with intraocular pressure (IOP) reduction post-surgery.

Main Methods:

  • 22 eyes (22 patients) underwent trabeculectomy.
  • Optic nerve head imaging was performed using Heidelberg Retinal Tomograph (HRT) pre- and post-surgery.

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  • Patients were grouped based on IOP change post-surgery (highest vs. lowest).
  • Statistical analysis included Wilcoxon signed rank test, Mann-Whitney rank sum test, and multiple regression analysis.

    • Main Results:

    • Significant improvement in cup volume was observed in the high IOP reduction group (Group A) post-surgery.
    • No significant changes in any HRT parameters were found in the low IOP reduction group (Group B).
    • Changes in cup disk area, cup volume, and mean cup depth were significantly influenced by IOP reduction (DeltaIOP and DeltaIOP%).
    • Cup shape changes were significantly influenced solely by DeltaIOP.

    Conclusions:

    • Certain optic disc parameters, measured by HRT, show significant improvement after trabeculectomy, contingent on the degree of IOP reduction.
    • The identified parameter changes may serve as outcome measures in glaucoma management.
    • Further long-term studies are necessary to validate these findings for clinical application.