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Optic nerve head circulation after intraocular pressure reduction achieved by trabeculectomy
Y Tamaki1, M Araie, T Hasegawa
1Department of Ophthalmology, University of Tokyo School of Medicine, Tokyo, Japan.
Ophthalmology
|March 10, 2001
Summary
Trabeculectomy and bleb needling in primary open-angle glaucoma patients did not significantly alter optic nerve head circulation. These glaucoma surgeries effectively reduced intraocular pressure but had minimal impact on optic nerve head blood flow.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Ocular Circulation
Background:
- Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
- Optic nerve head (ONH) damage in POAG is linked to impaired circulation.
- Trabeculectomy and bleb needling are surgical interventions to manage intraocular pressure (IOP) in glaucoma.
Purpose of the Study:
- To investigate the impact of trabeculectomy and bleb needling on ONH circulation in POAG patients.
- To assess changes in optic nerve head blood velocity following glaucoma surgery.
Main Methods:
- Prospective, nonrandomized, self-controlled trial involving 25 POAG patients.
- Laser speckle method used to measure normalized blur (NB) as an index of blood velocity in the ONH (NB(ONH)).
- Measurements of NB(ONH), intraocular pressure (IOP), blood pressure (BP), and pulse rate (PR) before and after procedures.
Main Results:
- Significant IOP reduction and ocular perfusion pressure increase (up to 38%) in the operated eye after both procedures.
- No significant changes observed in NB(ONH) in either operated or unoperated eyes.
- No significant changes in IOP, BP, or PR in the unoperated eye.
Conclusions:
- Trabeculectomy and bleb needling procedures result in minimal alterations to ONH circulation.
- While effective in lowering IOP, these glaucoma surgeries do not substantially affect optic nerve head blood flow.