Journal List > J Korean Ophthalmol Soc > v.49(8) > 1008051

Chang and Kim: The Effect of Flat Anterior Chamber on the Success of Ahmed Valve Implantation

Abstract

Purpose

To evaluate the outcome following Ahmed valve implantation in patients who developed flat anterior chamber.

Methods

The authors reviewed 60 eyes of 60 patients who underwent Ahmed valve implantation and divided these patients into the flat anterior chamber group (18 eyes) and the control group (42 eyes). The influence of clinical variables on the development of flat anterior chamber and the effect of flat anterior chamber on the success of Ahmed valve implantation were evaluated.

Results

The preoperative intraocular pressure, age, and the incidence of neovascular glaucoma as a preoperative diagnosis were higher in the flat anterior chamber group than in the control group (p<0.05). The overall success rates for the mean follow-up period of 12 months were similar between the two groups (p>0.05).

Conclusions

The development of a flat anterior chamber after Ahmed valve implantation appeared not to affect the outcome of the surgery.

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Figure 1
. Kaplan-Meier plots for the anterior chamber and control group. The overall survival rates were similar between two groups (log-rank test, p=0.757).
jkos-49-1297f1.tif
Figure 2
. Cox proportional hazard model plots for the flat anterior chamber and control group. The survival rates were similar between two groups (p=0.253).
jkos-49-1297f2.tif
Table 1.
Baseline preoperative characteristics of two groups
Flat chamber (n=18) Control (n=42) P-value
Age (yrs) 57.8±11.1 50.4±11.4 0.027*
Sex (M:F) 11:7 31:11 0.208
Preoperative IOP (mmHg) 46.3±16.7 35.2±13.4 0.010*
Eyes (OD:OS) 9:9 21:21 1.000
Lens status Phakia 15 27
Pseudophakia 3 13 0.682
Aphakia 0 2
Previous trabeculectomy (Yes: No) 18:0 34:8 0.091
Diagnosis NVG 17 23 0.006
Others 1 19
Type of valve (S2:FP7) 10:8 23:19 0.955
Mean follow up period 10.2±12.8 13.1±11.4 0.422*

* Independent T-test;

Pearson chi-square test;

Fisher’s exact test; IOP=Intraocular Pressure; NVG=Neovascular glaucoma.

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