Ahmed valve implantation to control intractable glaucoma after phacoemulsification and intraocular lens implantation in a dog

Abstract

An 11-year-old spayed female Miniature Poodle presented with bilateral senile cataracts. Treatment was cataract removal by phacoemulsification and intraocular lens implantation. Five hours after surgery the operated right eye was partially closed and painful. The right pupil was fully dilated, there was generalized corneal edema, and intraocular pressure (IOP) was increased. After 12 h of medication IOP was controlled. Ten weeks after surgery the owners reported cloudiness of right eye, and the dog was again evaluated. The IOP was again increased and an Ahmed valve was implanted. This case describes describe the progression of this case and benefits of controlling postcataract surgery glaucoma by the implantation of an Ahmed valve.

Comparison of diode laser trans‐scleral cyclophotocoagulation versus implantation of a 350‐mm2Baerveldt glaucoma drainage device for the treatment of glaucoma in dogs (a retrospective study: 2010‐2016)

“…Direct comparisons between studies to determine the efficacy of treatment modalities are difficult due to the varying study designs, including different definitions of success, as well as the spectrum of diseases that make up the glaucomas. Various GDDs have been used experimentally and in case reports involving single dogs . To the authors’ knowledge, of the published reports involving multiple cases treated with a GDD in a clinical setting both with and without adjunctive cyclodestruction, successful control of IOP is reported in 22.2%–80.9%, and maintenance of vision in 30.8%–57.9%.…”

“…In contrast, limited progress has been made in surgical techniques used for the management of canine glaucoma which primarily rely on the visual status of the eye. Published studies describing progress in glaucoma surgery in veterinary medicine are limited; 1 yet, cyclodestructive procedures [2][3][4][5][6][7][8][9][10][11] and implantation of glaucoma drainage devices (GDDs) to facilitate aqueous humor outflow 1,3,4,[12][13][14][15][16][17][18][19][20][21] have been described by several authors in the treatment of canine glaucomas.…”

Major breed distribution of canine patients enucleated or eviscerated due to glaucoma following routine cataract surgery as well as common histopathologic findings within enucleated globes

“…High‐resolution ultrasonographic assessment of iridocorneal angle and ciliary cleft structures may be of additional benefit when assessing surgical candidates . The potential for combined surgical procedures that aim to address not only lenticular opacity through phacoemulsification but also to minimize the risk of postoperative glaucoma through the concurrent application of IOP‐lowering techniques such as the inclusion of gonioimplants or the addition of limited ‘prophylactic’ cyclophotocoagulation (CPC) has recently been discussed . It is conceivable that endoscopic CPC may exert beneficial effects not only although a reduction in aqueous production but also by reducing the abrasion of reactive ciliary tissues against the lens capsule.…”

Surgical Treatment of Canine Glaucoma

“…3). [7][8][9][10][11][12][13][14][15] The subconjunctival space is the most common site for AH diversion, but experimental studies have investigated other possible outlets, such as the jugular vein via the facial vein, the subcutaneous space, and the parotid duct, with limited to no success. 16,17 The Cullen shunt to the frontal sinus has also been described.…”