Long-term Follow-up of Ahmed Glaucoma Valve Tube Position Changes
| Autor: | Yvonne M. Buys, Avner Belkin, Graham E. Trope, Stephanie A.W. Low, David J Mathew, Anindya Anuradha |
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| Rok vydání: | 2019 |
| Předmět: |
Adult patients
business.industry Long term follow up Glaucoma medicine.disease Glaucoma valve 03 medical and health sciences Ophthalmology 0302 clinical medicine medicine.anatomical_structure Cornea Tube length 030221 ophthalmology & optometry medicine sense organs Tube (container) Nuclear medicine business Visual axis 030217 neurology & neurosurgery |
| Zdroj: | Journal of Glaucoma. 28:276-280 |
| ISSN: | 1057-0829 |
| Popis: | Purpose To evaluate long-term (4.5 to 6 y) changes in the position of Ahmed glaucoma valve (AGV) tubes. Materials and methods Adult patients aged 18 years and above, 1 to 2 months post-AGV implantation were enrolled. Tube position was evaluated using anterior segment optical coherence tomography at baseline and final follow-up. The intracameral tube length (ICL), tube-cornea (TC) distance, and cornea-tube angle were measured. Wilcoxon-signed rank test was used to assess whether the changes in parameters from baseline were significant. Results In total, 11 eyes of 9 patients were included in the analysis. Mean duration of follow-up was 5.2±0.8 years (4.4 to 6.1 y). The ICL increased from 1.58±0.40 to 1.74±0.62 mm (P=0.18). The TC decreased from 0.36±0.12 to 0.29±0.05 mm (P=0.04). The cornea-tube angle decreased from 27.76±5.57 to 24.82±5.69 degrees (P=0.08). Overall, 73% of the tubes moved toward the cornea (mean 0.11 mm, over 4.4 to 6.1 y). In total, 73% showed an increase in ICL; 45% showed an increase of >0.3 mm [mean 0.50 mm (33%) increase]. Two of 11 tubes (18%) showed no significant change in the parameters (ICL, 0.03 and 0.01 mm increase; TC, 0 and 0.01 mm increase); these tubes were noted to lie on the iris. Conclusions Tubes tend to move toward the cornea over time. To avoid corneal damage and involvement of the visual axis in the future, tubes should be reasonably short and inserted tangentially, preferably in the posterior one third of the anterior chamber. |
| Databáze: | OpenAIRE |
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