Severe microbial keratitis in temperate and tropical Western Australia

Eye
A GebauerG J Crawford

Abstract

To determine the patterns of severe microbial keratitis in Western Australia, all acute admissions over a 2 year period to the Department of Ophthalmology, Royal Perth Hospital were assessed. Fifty-three cases (n = 53) of severe, presumed microbial keratitis were identified. Seventy per cent of these eyes had a visual acuity of 6/60 or less on admission and only 38.8% had 6/12 or better corrected acuity following resolution of the keratitis. The most commonly identified predisposing factors were: prior ocular surgery with or without exposed monofilament sutures (43.4%); contact lens wear (22.6%); lid malposition (17.0%); history of ocular trauma (15.1%); and history of previous herpes simplex keratitis (13.2%). It is notable that 26.4% of the subjects had been applying topical ophthalmic corticosteroids prior to admission. Following corneal scrape or biopsy a positive microbial diagnosis was made in 71% of samples, with Gram-negative and Gram-positive bacterial isolates being equally frequent. Five cases of Acanthamoeba keratitis were identified following corneal biopsy. Where antibiotic sensitivities were available, it was noted that 61.5% of Gram-positive and 46.1% of Gram-negative bacteria were susceptible to chloramphenicol...Continue Reading

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