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1 General aspects (0)   1.1 Epidemiology (5)   1.2 Population genetics (15)   1.3 Pathogenesis (6)   1.4 Quality of life (5)   1.5 Glaucomas as cause of blindness (0)   1.6 Prevention and screening (5) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (2)   2.2 Cornea (3)   2.3 Sclera (0)   2.4 Anterior chamber angle (0)   2.5 Meshwork (16)     2.5.1 Trabecular meshwork (0)     2.5.2 Schlemms canal (0)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (5)     2.6.1 Production (0)     2.6.2 Outflow (0)       2.6.2.1 Trabecular meshwork (0)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (0)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (0)   2.9 Ciliary body (0)   2.10 Lens (0)   2.11 Vitreous body (1)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (1)   2.13 Retina and retinal nerve fibre layer (14)   2.14 Optic disc (16)   2.15 Optic nerve (0)   2.16 Chiasma and retrochiasmal central nervous system (0)   2.17 Stem cells (0)   2.20 Other (0) 3 Laboratory methods (9)   3.1 Microscopy (0)   3.2 Electron microscopy (3)   3.3 Immunohistochemistry (1)   3.4 Molecular genetics (1)     3.4.1 Linkage studies (0)     3.4.2 Gene studies (0)   3.5 Molecular biology incl. 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    9.4.1 Steroid-induced glaucoma (2)     9.4.2 Glaucomas associated with disorders of the cornea, conjunctiva, sclera (0)       9.4.2.1 Iridocorneal endothelial syndrome (ICE, incl. irisatrophy) (0)       9.4.2.2 Posterior polymorphous dystrophy (0)       9.4.2.3 Fuchs' endothelial dystrophy (0)       9.4.2.5 Other (0)     9.4.3 Glaucomas associated with disorders of the iris and ciliary body (0)       9.4.3.1 Pigmentary glaucoma (0)       9.4.3.5 Other (0)     9.4.4 Glaucomas associated with disorders of the lens (1)       9.4.4.1 Exfoliation syndrome (7)       9.4.4.2 Glaucomas associated with cataracts (0)       9.4.4.3 Glaucomas associated with lens dislocation (0)       9.4.4.5 Other (0)     9.4.5 Glaucomas associated with disorders of the retina, choroid and vitreous (0)       9.4.5.1 Neovascular glaucoma (3)       9.4.5.5 Other (0)     9.4.6 Glaucomas associated with inflammation, uveitis (5)     9.4.7 Glaucomas associated with ocular trauma (0)     9.4.8 Glaucomas associated with intraocular tumors (0)     9.4.9 Glaucomas associated with elevated episcleral venous pressure (0)       9.4.10 Glaucomas associated with hemorrhage (0)     9.4.11 Glaucomas following intraocular surgery (0)       9.4.11.1 Ciliary block (malignant) glaucoma (0)       9.4.11.2 Glaucomas in aphakia and pseudophakia (0)       9.4.11.3 Epithelial, fibrous, and endothelial proliferation (0)       9.4.11.4 Glaucomas associated with corneal surgery (2)       9.4.11.5 Glaucomas associated with vitreoretinal surgery (3)     9.4.15 Glaucoma in relation to systemic disease (6)     9.4.20 Other (0) 10 Differential diagnosis e.g. anterior and posterior ischemic optic neuropathy (7) 11 Medical treatment (0)   11.1 General management, indication (9)   11.2 Cholinergic drugs (0)   11.3 Adrenergic drugs (0)     11.3.1 Epinephrine (0)     11.3.2 Thymoxamine, dapiprazole (0)     11.3.3 Apraclonidine, brimonidine (6)     11.3.4 Betablocker (16)     11.3.5 Other (0)   11.4 Prostaglandins (24)   11.5 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tube implant (6)     12.8.2 With tube implant or other drainage devices (9)     12.8.3 Non-perforating (6)     12.8.4 Using laser (1)     12.8.5 Other (0)     12.8.10 Woundhealing antifibrosis (7)     12.8.11 Complications, endophthalmitis (8)   12.9 Trabeculotomy, goniotomy (3)   12.10 Cyclodestruction (4)   12.11 Cyclodialysis (0)   12.12 Cataract extraction (0)     12.12.1 Intracapsular (0)     12.12.2 Extracapsular (1)     12.12.3 Phacoemulsification (9)   12.14 Combined cataract extraction and glaucoma surgery (0)     12.14.1 Intracapsular (0)     12.14.2 Extracapsular (1)     12.14.3 Phacoemulsification (9)   12.15 Capsulotomy (0)   12.16 Vitrectomy (0)   12.17 Anesthesia (6)   12.20 Other (4) 13 Therapeutic prognosis and outcome (0)   13.1 Prognostic factors (0)   13.2 Outcome (0)     13.2.1 IOP (0)     13.2.2 Visual field (0)       13.2.2.1 Progression (0)       13.2.2.2 Improvement (0)     13.2.3 Other (0) 14 Costing studies; pharmacoeconomics (4) 15 Miscellaneous (4)

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Abstract #8352 Published in IGR 4-3

Time-dependent effects of sympathetic denervation on aqueous humor dynamics and choroidal blood flow in rabbits

Zhan G; Lee P; Ball D; Mayberger C; Tafoya M; Camras C; Toris C
Current Eye Research 2002; 25: 99-105

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PURPOSE: This study investigates the time-dependent effects of superior cervical ganglionectomy (SCGx) on aqueous humor dynamics and ocular blood flow in rabbits. METHODS: Measurements were made at various times between 24 hours and 12 months after SCGx. Intraocular pressure (IOP) was measured by pneumatonometry, aqueous flow by fluorophotometry and outflow facility by tonography. Uveoscleral outflow was determined by an intracameral tracer infusion technique and blood flow to the choroid was evaluated with fluorescent microspheres. Values in denervated eyes were compared with the contralateral, normally-innervated eyes using a paired Student's two-tailed t test. RESULTS: At 24 hours after SCGx, IOP in denervated eyes was less than in normally-innervated eyes (14.6 ± 0.8 versus 20.1 ± 1.5 mmHg, 27%, p < 0.002). At one month, there was no difference in IOP between the eyes. Compared with normally-innervated eyes at ten to 12 months, IOP in denervated eyes was greater (20.4 ± 0.7 versus 17.2 ± 0.9 mmHg, 19%, p < 0.001), outflow facility was less (0.15 ± 0.02 versus 0.21 ± 0.01 μl/min/mmHg, 29%, p < 0.01) and blood flow to the choroid was less (12.1 ± 5.0 versus 16.2 ± 6.0 ml/min/g tissue, 25%, p < 0.05). Aqueous humor flow was not significantly altered by SCGx at any time. CONCLUSIONS: The reduction in IOP at 24 hours after SCGx was not due to any change in aqueous flow or uveoscleral outflow (current study), but rather to an increase in outflow facility (previous studies). At ten to 12 months, IOP was elevated because outflow facility was significantly reduced. The reduction in choroidal blood flow at ten to 12 months may have occurred because of the increased IOP.

G. Zhan, MD, Department of Ophthalmology, University of Nebraska Medical Center, Omaha, NE, USA

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Classification:

2.6 Aqueous humor dynamics (Part of: 2 Anatomical structures in glaucoma)
2.11 Vitreous body (Part of: 2 Anatomical structures in glaucoma)

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