The Effect of Flat Anterior Chamber on the Success of Ahmed Valve Implantation

Min Wook Chang; Yong Yeon Kim

doi:10.3341/jkos.2008.49.8.1297

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

Original Article

J Korean Ophthalmol Soc 2008;49(8):1297-1302.

Published online: 7 September 2008

DOI: https://doi.org/10.3341/jkos.2008.49.8.1297

The Effect of Flat Anterior Chamber on the Success of Ahmed Valve Implantation

Min Wook Chang, M.D., Yong Yeon Kim, M.D., Ph.D.

Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea

Address reprint requests to Yong Yeon Kim, M.D., Ph.D. Department of Ophthalmology, Guro Hospital, Korea University College of Medicine #80 Gurodong, Guro-gu, Seoul 152-703, Korea Tel: 82-2-2626-1260, Fax: 82-2-857-8580, E-mail: yongykim@mail.korea.ac.kr

Received 15 April 2008 Accepted 14 January 2008

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Keywords: Ahmed valve, Flat anterior chamber, Intraocular pressure, Neovascular glaucoma

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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).

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).

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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