Need for Additional Glaucoma Surgery and Complications Following Glaucoma Drainage Device Surgery

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Medical Devices

Background:

• Glaucoma drainage devices (GDDs) are used to manage refractory glaucomas.
• Long-term outcomes and complication rates following GDD implantation vary by glaucoma type.
• Understanding these outcomes is crucial for patient management and surgical planning.

Purpose of the Study:

• To assess the need for additional glaucoma surgery and the development of complications after initial GDD surgery.
• To compare outcomes in patients with open-angle glaucoma (OAG), pseudoexfoliative glaucoma (PXE), and neovascular glaucoma (NVG).

Main Methods:

• A longitudinal study included 306 eyes with OAG, PXE, or NVG that received a first GDD between 1996 and 2017.
• Outcomes measured included glaucoma reoperation, corneal graft procedures, and visually threatening complications (VT-complications).
• Kaplan-Meier analysis was used to compare cumulative event rates over time among the glaucoma groups.

Main Results:

• No significant differences in cumulative reoperation, corneal graft, or VT-complication rates were observed between OAG, PXE, and NVG groups.
• For all eyes, cumulative rates for reoperation, corneal graft, and VT-complications increased beyond 5 years post-implantation.
• The Ahmed FP7 GDD showed a higher cumulative reoperation rate over time compared to the Baerveldt 350 GDD.

Conclusions:

• Glaucoma type does not significantly influence the long-term cumulative rates of reoperation, corneal graft, or VT-complications after GDD surgery.
• The risk of reoperation, corneal graft, and VT-complications continues to increase beyond 5 years following GDD placement.
• Specific GDDs, such as the Ahmed FP7, may have different reoperation profiles compared to others like the Baerveldt 350.