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The Clinical Use of Ahmed Valve Implant as an Aqueous Shunt for Control of Uveitic Glaucoma in Dogs

Authors: Khaled M. Ali, M. A. Abdel-Hamid, Ayman A. Mostafa

Abstract:

Objective: Safety and efficacy of Ahmed glaucoma valve implantation for the management of uveitis induced glaucoma evaluated on the five dogs with uncontrollable glaucoma. Materials and Methods: Ahmed Glaucoma Valve (AGV®; New World Medical, Rancho Cucamonga, CA, USA) is a flow restrictive, nonobstructive self-regulating valve system. Preoperative ocular evaluation included direct ophthalmoscopy and measurement of the intraocular pressure (IOP). The implant was examined and primed prior to implantation. The selected site of the valve implantation was the superior quadrant between the superior and lateral rectus muscles. A fornix-based incision was made through the conjunectiva and Tenon’s capsule. A pocket is formed by blunt dissection of Tenon’s capsule from the episclera. The body of the implant was inserted into the pocket with the leading edge of the device around 8-10 mm from the limbus. Results: No post-operative complications were detected in the operated eyes except a persistent corneal edema occupied the upper half of the cornea in one case. Hyphaema was very mild and seen only in two cases which resolved quickly two days after surgery. Endoscopical evaluation for the operated eyes revealed a normal ocular fundus with clearly visible optic papilla, tapetum and retinal blood vessels. No evidence of hemorrhage, infection, adhesions or retinal abnormalities was detected. Conclusion: Ahmed glaucoma valve is safe and effective implant for treatment of uveitic glaucoma in dogs.

Keywords: Ahmed valve, endoscopy, glaucoma, ocular fundus.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1110768

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References:


[1] K .S. Schwartz, R.K. Lee, and S.J. Gedde, Glaucoma drainage implants: a critical comparison of types. Current Opinion in Ophthalmology, 2006, 17: 181–189.
[2] S. J. Gedde, J.C. W.J. Schiffman Feuer, L.W. Herndon, and J.D. Brandt, Treatment Outcomes in the Tube versus Trabeculectomy (TVT) Study After Five Years of Follow-up. AJOPHT, 2012, 153: 789–803.
[3] R. P. Wilson, L. Cantor, L.J. Katz, C.M. Schmidt, W.C. Steinmann, and S. Allee, Aqueous Shunts. Molteno versus Schocket. Ophthalmology, 1992, (99):672-8.
[4] S. W. Siegner, P.A. Netland, R.C. Urban, A.S. Silliams, D.W. Richards, M. A. Latina, and J.D. Brandt, Clinical experience with the Baeveldt glaucoma drainage implant. Ophthalmology, 1995, (102):1298-309.
[5] P. E. Miller, and J.P. Pickett, Comparison of the human and canine Schiotz tonometry conversion tables in clinically normal cats. Journal of the American Veterinary Medical Association, 1992, 201:1017.
[6] K. M. Ali, Studies on glaucoma in dogs. PhD thesis: Cairo University, Egypt. 2014.
[7] G. W. Snedecor, and W.G. Cochran, Statistical methods. 6 Ed., Iowa state Univ. press, Iowa, U.S.A., 1976.
[8] T. Krupin, S.M. Podos, and B. Becker, Valve implants in filtering surgery. A preliminary report. Am J Ophthalmol. 1976, 81:232-5.
[9] A. C. B. Molteno, The optimal design of drainage implants for glaucoma. Trans Ophthalmol Sc NZ, 1981, 33:39-41.
[10] R. P. Mills, A. Reynolds, M.J. Emond, W.E. Barlow, and M.M. Leen, Long-term survival of Moltenoof Molteno glaucoma drainage devices. Ophthalmology, 1996, 103:299-305.
[11] R. S. Ayyala, L.E. Harman, A.F. Michelini-Norris, L.E. Ondrovic, E. Haller, C.E. Margo, and S.X. Stevens, Comparison of different biomaterials for the glaucoma drainage devices. Arch Ophthalmol., 1999; 117:233-6.
[12] R. S. Ayyala, A.F. Michelini-Norris, A. Flores, E. Haller, and C.E. Margo, Comparison of different biomaterials for glaucoma drainage devices. Part 2. Arch Ophthalmol., 2000, 118:1081-4.
[13] D. P. Taglia, T.W. Perkins, and R. Gangnon, Comparison of the Ahmed glaucoma valve, the Krupin eye valve with disk, and the double-plate Molteno implant. J Glaucoma, 2002, 11: 347–353.
[14] R. S. Ayyala, D. Zurakowski, J.A. Smith, R. Monshizadeh, P.A. Netland, D.W Richards, and W.E. Layden, A clinical study of the Ahmed Glaucoma Valve implant in advanced glaucoma. Am.,J., 1998, (105);1968-76.