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Ahmed glaucoma valves in refractory glaucoma: a 7-year audit
Peter K Wishart1, Anshoo Choudhary, David Wong
1St Paul's Eye Unit, Royal Liverpool University Hospital, Prescot Street, Liverpool L7 8XP, UK. Peter.Wishart@rlbuht.nhs.uk
The British Journal of Ophthalmology
|December 8, 2009
Summary
Ahmed Glaucoma Valve (AGV) implantation provides effective long-term intraocular pressure (IOP) control for glaucoma patients. Modified techniques in high-risk eyes may reduce hypotony complications.
Area of Science:
- Ophthalmology
- Glaucoma Surgery
- Medical Devices
Background:
- Glaucoma is a leading cause of irreversible blindness.
- Ahmed Glaucoma Valve (AGV) implantation is a surgical option for managing refractory glaucoma.
- Long-term outcomes and complication profiles of AGV implantation require continued investigation.
Purpose of the Study:
- To evaluate the long-term efficacy and safety of Ahmed Glaucoma Valve (AGV) implantation.
- To compare outcomes between standard AGV implantation and a modified technique in high-risk eyes.
Main Methods:
- A consecutive case series of 94 eyes undergoing AGV implantation over 7 years.
- Eyes were categorized into standard phakic (A), standard pseudophakic/aphakic (B), and high-risk with temporary tube ligation and C3F8 gas fill (G&L).
- Success defined as intraocular pressure (IOP) between 6-21 mmHg and/or ≥20% IOP reduction.
Main Results:
- Mean follow-up was 28.9 months; mean IOP decreased from 30.8 to 19.7 mmHg.
- The overall success rate was 78.7% with a 1-year survival of 89.1% and 4-year survival of 72.9%.
- Postoperative hypotony complications occurred only in group B; no significant difference in success rates among groups.
Conclusions:
- Ahmed Glaucoma Valve implantation demonstrates good long-term IOP control.
- Temporary tube ligation with C3F8 gas fill is recommended for high-risk eyes to mitigate hypotony.
- Use of donor sclera or pericardial patch is advised to prevent tube erosion.
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