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  • Title: Effect of vitrectomy on the ocular distribution of gentamicin in the rabbit.
    Author: Garcia-Salinas R, Hasany S, Chisholm L, Basu PK, Moffat K, Harvey P.
    Journal: Can J Ophthalmol; 1991 Jun; 26(4):196-9. PubMed ID: 1889020.
    Abstract:
    To determine whether vitrectomy affects the ocular distribution of intravitreally injected gentamicin sulfate, 25 pigmented rabbits received an intravitreal injection of gentamicin (control group), and 25 other pigmented rabbits underwent pars plana vitrectomy followed by an intravitreal injection of gentamicin (experimental group). The animals were killed in groups of five 1, 3, 6, 12 and 24 hours after the injection. The mean retinal gentamicin levels 1 and 3 hours after the injection were significantly higher in the experimental group than in the control group (p less than 0.01). The mean gentamicin level in the aqueous humour was significantly lower in the experimental group than in the control group 1 hour (p less than 0.01), 6 hours (p less than 0.01) and 24 hours (p less than 0.001) after the injection. The mean corneal gentamicin level 24 hours after the injection was significantly lower in the experimental group than in the control group (p less than 0.05). There was no significant difference in mean choroidal gentamicin level between the two groups. We conclude that vitrectomy significantly affects the ocular distribution of gentamicin in the rabbit.
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