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Carbonic anhydrase inhibition increases retinal oxygen tension and dilates retinal vessels

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Authors
Pedersen, Daniella Bach
Koch Jensen, Peter
la Cour, Morten
Kiilgaard, Jens Folke
Eysteinsson, Thor
Bang, Kurt
Wiencke, Anne Kathrine
Stefansson, Einar
Issue Date
2005-02-01

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Citation
Graefes Arch. Clin. Exp. Ophthalmol. 2005, 243(2):163-8
Abstract
BACKGROUND: Carbonic anhydrase inhibitors (CAIs) increase blood flow in the brain and probably also in the optic nerve and retina. Additionally they elevate the oxygen tension in the optic nerve in the pig. We propose that they also raise the oxygen tension in the retina. We studied the oxygen tension in the pig retina and optic nerve before and after dorzolamide injection. Also the retinal vessel diameters during carbonic anhydrase inhibition were studied. METHODS: A polarographic oxygen electrode was placed transvitreally immediately over the retina or the optic disc in anaesthetised pigs. The oxygen tension was recorded continually and 500 mg dorzolamide was injected intravenously. Retinal vessel diameters were analysed from monochromatic fundus photographs taken before and after injection of dorzolamide. RESULTS: Baseline retinal oxygen tension (RPO2) was 3.34+/-0.50 kPa (mean +/- SD, n=6) and baseline optic nerve oxygen tension (ONPO2) was 3.63+/-1.00 kPa. RPO2 was increased by 0.36+/-0.11 kPa (n=6, P=0.025) and ONPO2 by 0.73+/-0.34 kPa (n=6, P=0.003) 30 min after dorzolamide administration. The retinal arterioles was significantly dilated by 13+/-7% (n=5, P=0.016) and the retinal venules by 12+/-8% (n=5, P=0.030) 30 min after injection of dorzolamide. CONCLUSION: Retinal and optic nerve oxygen tension increased with systemic administration of dorzolamide. The retinal vessels dilated, probably causing increased blood flow inducing the observed increase in RPO2. The increased oxygenation of retina by CAI may offer therapeutic possibilities in ischaemic diseases of the retina and optic nerve.
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http://www.springerlink.com/content/kh2a7mcp14nwxfj5
ae974a485f413a2113503eed53cd6c53
10.1007/s00417-003-0817-3
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English Journal Articles (Peer Reviewed)

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