Electroretinographic effects of an intravitreal injection of triamcinolone in rabbit retina.
OBJECTIVE
To investigate the clinical, histologic, and electroretinographic effects of intravitreal injection of triamcinolone acetonide suspension in the rabbit retina.


METHODS
Three groups of 6 rabbits each received intravitreal injections. Group 1 received 4 mg of triamcinolone acetonide, group 2 received an equal volume (0.1 mL) of the corticosteroid supernatant, and group 3 received 4 mg of triamcinolone acetonide with the supernatant replaced with balanced salt solution. Uninjected left eyes served as controls. Electroretinograms were obtained at baseline and at 3 to 4 and 6 to 7 days after injection of triamcinolone. Enucleated eyes were examined histologically.


RESULTS
Ocular examination revealed no differences among the 3 groups. When subjected to stimulation with moderate to high flash intensities, eyes that had received intravitreal injections of triamcinolone (groups 1 and 3) had a 10% to 25% increase in dark-adapted a- and b-wave electroretinographic amplitudes. No histologic differences were observed between injected and control eyes.


CONCLUSIONS
Intravitreal injection of 4 mg of triamcinolone acetonide does not cause a toxic reaction in the rabbit retina after 7 days. Triamcinolone therapy may augment the rod-driven electroretinographic responses, suggesting a mechanism by which visual function may improve. Clinical Relevance Evaluation of the toxic effects of triamcinolone is useful because of increased applications of intravitreal injection.
Dierks
Dustin
D
Mason Eye Institute, University of Missouri-Columbia, 65212, USA.
Lei
Bo
B
Zhang
Keqing
K
Hainsworth
Dean P
DP
D000818:Animals; D003623:Dark Adaptation; D004596:Electroretinography / Q000187:drug effects*; D005938:Glucocorticoids / Q000633:toxicity*; D007267:Injections; D010775:Photic Stimulation; D011817:Rabbits; D012160:Retina / Q000187:drug effects* / Q000502:physiology; D014222:Triamcinolone Acetonide / Q000633:toxicity*; D014785:Vision, Ocular / Q000187:drug effects / Q000502:physiology; D014822:Vitreous Body
D005938:Glucocorticoids; D014222:Triamcinolone Acetonide