Posters

MRI evaluation of Ahmed glaucoma valve bleb and correlation to intraocular pressure in neovascular glaucoma

Poster Details

First Author: C.Kalamkar INDIA

Co Author(s):    A. Mukherjee                    

Abstract Details

Purpose:

To report results of morphological evaluation of blebs in patients with Ahmed Glaucoma Valve(AGV) implant using Magnetic Resonance Imaging (MRI) and to correlated these parameters with pre-operative and post-operative intraocular pressures (IOP).

Setting:

Shri Ganesh Vinayak Eye Hospital, Raipur, India

Methods:

Retrospective, consecutive, hospital based case series of 12 adult refractory neovascular glaucoma (NVG) patients who underwent AGV implantation from September 2014 onwards. Minimum follow-up of 6 months. MRI was done to evaluate bleb morphology (bleb height, measurements in 2 axis and bleb volume). Pre-operative and post-operative IOP were correlated with bleb parameters.

Results:

There was a positive correlation between post operative IOP and Bleb volume [r = +0.557, p <0.0001] and bleb height [r = +0.406, p<0.0001]. There was no correlation between preoperative IOP or percentage reduction in IOP and bleb parameters. IOP reduced significantly from preoperative levels (preoperative: 41.5 +/- 9.77 mmHg vs. Postoperative: 15.5 +/- 2.28 mm Hg, p < 0.001). MRI demonstrated presence of fluid not only above the AGV plate but also between plate and sclera in all patients. Small sample size and shorter duration of follow-up are the main limitations of this study.

Conclusions:

In patients with AGV implant, evaluation of bleb morphology using MRI may provide useful insight into the mechanisms of functioning and failure of AGV

Financial Disclosure:

None