Intraocular Pressure Control and Corneal Graft Survival After Implantation of Ahmed Valve Device in High-Risk Penetrating Keratoplasty.
Almousa, Radwan MD, MRCSEd, FRCOphth; Nanavaty, Mayank A. DO, MRCSEd, FRCOphth; Daya, Sheraz M. MD, FACP, FACS, FRCSEd; Lake, Damian B. MBChB, FRCOphth
32(8):1099-1104, August 2013.
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Purpose: To analyze the control of intraocular pressure (IOP) and corneal graft survival after implantation of Ahmed glaucoma device (AGD) in eyes that had high-risk penetrating keratoplasty (PK).
Methods: This is a retrospective noncomparative case series of 59 eyes that had high-risk PK and underwent AGD insertion. The primary outcome measures are the control of IOP between 6 and 21 mm Hg and corneal graft survival. The secondary outcome measures are risk factors associated with IOP control and corneal graft survival.
Results: The mean IOP reduced significantly after the AGD procedure (26.45 /- 6.8 mm Hg preoperatively vs. 16.85 /- 7.4 mm Hg, 16.95 /- 4.6 mm Hg, 17.97 /- 5.7 mm Hg, 15.78 /- 5.2 mm Hg, and 15.59 /- 5.5 mm Hg, at 1 month, 6 months, 1 year, 2 years, and at the last follow-up postoperatively; P < 0.0001). Over a median follow-up of 78 months (range, 9-175 months) after AGD insertion, IOP control was successful in 44 eyes (75.8%). IOP control was successful in 96% of the eyes at 1 year, 87% at 2 years, 83% at 3 years, and 83% at 5 years. The percentage of clear corneal grafts after 1, 2, 3, and 5 years following the AGD insertion were 87%, 77%, 65%, and 47%, respectively. Further surgery after AGD insertion was associated with 1.79 times greater risk of failure of IOP control.
Conclusions: AGD was effective in controlling the IOP associated with high-risk PK over a 5-year period. Postvalve surgery doubles the risk of failure of IOP control.
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