Suppression of laser-induced choroidal neovascularization by posterior sub-tenon administration of triamcinolone acetonide

To evaluate the inhibitory effect of triamcinolone acetonide (TA) on choroidal neovascularization (CNV) by posterior sub-Tenon administration using a laser-induced CNV model in the rat.

Experimental CNV was induced by laser photocoagulation in Brown-Norway male rats. Experimental eyes received posterior sub-Tenon administration of either 2 mg (n = 10) or 0.5 mg (n = 8) of TA. Control eyes (n = 10) received posterior sub-Tenon administration of isotonic sodium chloride solution. Two weeks after treatment, CNV was evaluated by fluorescein angiography and histopathological examination. Concentrations of TA in the vitreous, retina, and choroid were determined by high-performance liquid chromatography at 3 and 7 days after posterior sub-Tenon administration.

The eyes treated with 2 mg of TA showed statistically significant inhibition of fluorescein leakage by fluorescein angiography, as compared with control eyes and eyes treated with 0.5 mg of TA (P < 0.01). The thickness of CNV membranes in eyes treated with 2 mg of TA also decreased statistically significantly, as compared with control eyes (P < 0.01). TA was detected in the vitreous, retina, and choroid 3 days after administration and in the choroid 7 days after administration.

Posterior sub-Tenon administration of TA may be useful to treat CNV.