Panretinal photocoagulation with simultaneous cryoretinopexy or intravitreal bevacizumab for neovascular glaucoma

Background

To compare the therapeutic effects of panretinal photocoagulation (PRP) combined with intravitreal bevacizumab (IVB) and cryoretinopexy (CR-IVB) to that of PRP combined with IVB alone in eyes with neovascular glaucoma (NVG).

Design

Retrospective, consecutive, case-control study.

Methods

The medical records of 102 eyes of 96 patients with NVG due to proliferative diabetic retinopathy, central retinal vein occlusion, and ocular ischemic syndrome were reviewed. The mean age of the patients was 59.6?±?11.5 years, with a range of 34 to 84 years. Patients received either 1.25 mg/0.05 ml of IVB combined with 360° of cryotherapy of the peripheral retina (CR-IVB subgroup) or IVB alone (IVB alone subgroup) as adjunctive treatments to PRP. The patients were followed for at least 12 months. Fifty-four eyes of 49 patients had open-angle NVG; 30 of these eyes were treated by CR-IVB, and 24 eyes by IVB alone. Forty-eight eyes of 48 patients had angle-closure NVG; 22 of these eyes were treated by CR-IVB, and 26 eyes were by IVB alone. Failure was defined as a postoperative intraocular pressure (IOP) >21 mmHg for two consecutive follow-up visits, or the need of additional surgery such as trabeculectomy or diode laser cycloablation. The differences in the success rates between the CR-IVB and IVB alone subgroups for the eyes with open-angle and closed-angle NVG were compared.

Results

The success rate at 12 months in eyes with open-angle NVG was 80.0 % in the CR-IVB subgroup and 41.7 % in the IVB alone subgroup (P?=?0.0096). In eyes with angle-closure NVG, the success rate at 12 months was 22.7 % in the CR-IVB subgroup and 0 % in the IVB-alone subgroup (P?=?0.030).

Conclusion

The significantly better IOP control after PRP combined with cryotherapy and IVB than after PRP with IVB alone indicates that cryotherapy enhances the effectiveness of PRP for neovascular glaucoma for at least 1 year.