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Glaucoma filtration surgery using amniotic membrane transplantation.

K Barton1, D L Budenz, P T Khaw

  • 1Bascom Palmer Eye Institute, University of Miami School of Medicine, Florida, USA. keith1barton@cs.com

Investigative Ophthalmology & Visual Science
|June 30, 2001
PubMed
Summary

Amniotic membrane transplantation (AMT) shows promise for glaucoma filtering blebs, improving bleb survival but potentially delaying healing. Further research is needed to balance benefits against risks like inflammation.

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Area of Science:

  • Ophthalmology
  • Regenerative Medicine
  • Surgical Innovation

Background:

  • Glaucoma filtration surgery aims to reduce intraocular pressure (IOP).
  • Conjunctival tissue is traditionally used for filtering bleb construction.
  • Alternative biomaterials are explored to improve surgical outcomes.

Purpose of the Study:

  • To evaluate amniotic membrane transplantation (AMT) as a substitute for conjunctiva in glaucoma filtering blebs.
  • To assess the impact of AMT on bleb formation, IOP, and healing response in a rabbit model.

Main Methods:

  • Glaucoma filtration surgery was performed on 24 albino rabbits.
  • Amniotic membrane transplantation (AMT) was used in alternate cases, replacing the conjunctival flap.
  • Postoperative IOP, bleb survival, and fibroblast outgrowth were analyzed at multiple time points.

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Main Results:

  • Amniotic membranes epithelialized within approximately 11 days.
  • AMT eyes showed significantly greater IOP reduction between postoperative days 11-16.
  • Filtration surgery survival was significantly longer in the AMT group (22.3 days) versus controls (14.0 days).
  • Fibroblast outgrowth was significantly reduced with AMT compared to conjunctiva.
  • Histology revealed granulomatous inflammation and membrane lysis after 36 days.

Conclusions:

  • Amniotic membrane transplantation (AMT) demonstrates potential as an alternative to conjunctiva for glaucoma filtering blebs.
  • AMT retards the healing response, evidenced by reduced fibroblast outgrowth.
  • The enhanced bleb survival with AMT must be considered alongside risks of delayed healing and xenograft reactions.