Failure of intravitreal dexamethasone to diminish inflammation or retinal toxicity in an experimental model of Bacillus cereus endophthalmitis.

Abstract:

PURPOSE:To determine whether the usual clinical dose of intravitreal dexamethasone can attenuate intraocular inflammation and retinal necrosis in a rabbit model of fulminant Bacillus cereus endophthalmitis induced by crude exotoxins. METHODS:Thirty-six eyes from pigmented mongrel rabbits received intravitreal injections of varying concentrations of crude B. cereus exotoxins with or without concomitant injections of 400 microg of dexamethasone sodium phosphate (0.1% solution). After ophthalmoscopic examination at 4 or 18 hr postinjection, the animals were killed and histopathologic findings graded. RESULTS:Intraocular inflammation and retinal necrosis scores in eyes receiving both exotoxins and dexamethasone did not differ significantly from eyes receiving exotoxins alone for any exotoxin dose at 4 or 18 hr. The severity of retinal necrosis increased with toxin dose and was nearly maximal after 4 hr. Intraocular inflammation also generally increased with dose, but continued to increase until 18 hr. CONCLUSIONS:Standard clinical doses of intravitreal dexamethasone do not appear to attenuate the intraocular inflammatory or tissue response to secreted B. cereus exotoxins. Other treatment modalities including vitrectomy, to decrease exotoxin load, and exotoxin inhibitors may be necessary for the effective treatment of B. cereus endophthalmitis.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Pollack JS,Beecher DJ,Pulido JS,Lee Wong AC

doi

10.1080/02713680490516701

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

253-9

issue

4-5

eissn

0271-3683

issn

1460-2202

pii

NU637J2HAFXW3N0W

journal_volume

29

pub_type

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