September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Outcomes of Ahmed Glaucoma Valve Mechanism Removals
Author Affiliations & Notes
  • Stephanie Cote
    Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
  • Paul MacKenzie
    Department of Ophthalmology & Visual Sciences, University of British Columbia, Vancouver, British Columbia, Canada
  • Andrew C Crichton
    Department of Ophthalmology, University of Calgary, Calgary, Alberta, Canada
  • Footnotes
    Commercial Relationships   Stephanie Cote, None; Paul MacKenzie, None; Andrew Crichton, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 6489. doi:
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      Stephanie Cote, Paul MacKenzie, Andrew C Crichton; Outcomes of Ahmed Glaucoma Valve Mechanism Removals. Invest. Ophthalmol. Vis. Sci. 2016;57(12):6489.

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose : To report the outcome, particularly the effect on intraocular pressures (IOP) after Ahmed Glaucoma Valve (AGV) mechanism removal due to inadequate pressure control. There are two groups that can be considered: those who experienced either early or late AGV failure.

Methods : This is a retrospective case series of fourteen patients (fifteen eyes) that underwent an AGV revision between January 2009 and November 2015 by two surgeons at two different sites. The following information was recorded for each patient: age, gender, past ocular history, best corrected visual acuity (BCVA), IOP, number of glaucoma medications, and complications.

Results : Fifteen eyes of fourteen patients underwent Ahmed Glaucoma Valve revision were included in the analysis. Average age was 62.16 ± 12.55 years, age range was 35 - 81 years, and 92.9% were males. Mean baseline IOP of 3 measurements before revision was 26.53 ± 4.82 mmHg. The mean IOP 1 day after mechanism removal was 12.27 ± 6.93 mmHg, after 1 week was 13 ± 7.21 mmHg, after 1 month was 16 ± 4.20 mmHg, and after 6 months was 17.88 ± 3.64 mmHg when data was available. Mean baseline number of glaucoma medications were 3.6 ± 1.06. Mean number of glaucoma medications at 1 week were 0.57 ± 1.22, at 1 month were 1.15 ± 1.72, and 6 months was 2.5 ± 1.51.

Conclusions : In this retrospective analysis, a reduction in IOP was observed on most patients who underwent AGV mechanism removal, suggesting viability of this procedure in certain situations of both early and late Ahmed valve failure.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.


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