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Intraocular concentration of triamcinolone acetonide after intravitreal injection in the rabbit eye.

Abstract：

PURPOSE:To examine the decrease in the intraocular concentration of intravitreally injected triamcinolone acetonide over an 8-month period in a rabbit model. DESIGN:Experimental study. PARTICIPANTS:The study included 18 white New Zealand rabbits. METHODS:The animals received an intravitreal injection of 6 mg triamcinolone acetonide. Vitreous and aqueous humor samples of the anterior and posterior chamber were taken at the first and third day, at 1 and 2 weeks, and at 1, 1.5, 2, 3, 6, and 8 months. The concentrations of triamcinolone were analyzed using a high-phase liquid chromatography assay. MAIN OUTCOME MEASURES:Intraocular concentration of triamcinolone during follow-up. RESULTS:Over the entire study period, triamcinolone concentrations were significantly higher in the vitreous samples than in the anterior chamber samples (day 1, 14 434+/-10 768 microg/l vs. 21.0+/-18.9 microg/l; day 30, 571.3+/-329.6 microg/l vs. 6.1+/-1.6 microg/l; month 8, 70.7+/-37.0 microg/l vs. 3.3+/-1.6 microg/l). In the anterior chamber, the triamcinolone concentrations were highest at 3 days after the injection (28.9+/-24.5 microg/l), and in the vitreous, the concentrations were highest at the first day (14,434.0+/-10,768 microg/l). Triamcinolone levels in the vitreous and in the anterior chamber followed a 2-compartment model, with an exponential decrease in the concentration within the first 4 weeks, followed by a steady decline over the following months. At 8 months, the triamcinolone concentrations were 70.7+/-37.0 microg/l in the vitreous samples and 3.3+/-1.6 microg/l in the anterior chamber samples. CONCLUSIONS:The decrease in the concentration of triamcinolone after an intravitreal injection of 6 mg in rabbits follows a 2-compartment model, with an exponential decrease in the first 4 weeks followed by a more linear decrease. During the entire study period, the triamcinolone concentration was significantly higher in the vitreous than in the anterior chamber. After a single intravitreal triamcinolone injection of 6 mg in rabbits, triamcinolone is detectable for at least 8 months after the injection.

journal_name

Ophthalmology

journal_title

Ophthalmology

authors

Kamppeter BA,Cej A,Jonas JB

doi

10.1016/j.ophtha.2008.01.019

subject

Has Abstract

pub_date

2008-08-01 00:00:00

pages

1372-5

issue

8

eissn

0161-6420

issn

1549-4713

pii

S0161-6420(08)00067-5

journal_volume

115

pub_type

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