Abstract
Purpose: :
To compare the results of Ahmed Glaucoma Valve implantation in eyes with silicone oil to those without silicone oil.
Methods: :
In this retrospective comparative case–control study, we reviewed 68 eyes of 68 patients, comparing the surgical outcomes in eyes with silicone oil (N=34) to matched patients without silicone oil (N=34). Success was defined as intraocular pressure (IOP) of 6 mmHg and 21 mmHg, with or without the use of glaucoma medicines, without further glaucoma surgery, and without loss of light perception.
Results: :
Average follow–up was 21 mo for silicone oil group and 24 mo for control (P=0.11). Mean IOP within 2 weeks postoperatively was significantly higher in the silicone oil group (P<0.05) and hypertensive phase within 6 mo was observed more frequently in the silicone group than in the control group (P<0.01). However, mean IOP at last follow–up was comparable between the 2 groups (15.1 7.3 mmHg in silicone oil group and 15.0 3.8 mmHg in control, P=0.60). The mean number of glaucoma medications was 1.2 1.2 and 1.6 1.3 (P=0.14) in silicone oil group and control, respectively, at the most recent follow–up. Cumulative probability of success by life–table analysis was 73% at 1 year, 66% at 2 yrs, and 44% at 4 yrs in silicone oil group, and 100% at 1 year, 89% at 2 yrs, and 67% at 4 yrs, respectively.(P=0.01). Complications were comparable between 2 groups (P>0.05). In 14 (43%) of 34 silicone treated eyes, silicone was observed adhering to the tube in the anterior chamber after surgery.
Conclusions: :
Eyes treated with silicone oil have a poor prognosis for surgical success after Ahmed Glaucoma Valve implantation compared with eyes not treated with silicone oil.
Keywords: intraocular pressure • vitreoretinal surgery