RESUMO
PURPOSE: To report the beneficial properties of argon laser as an adjunctive therapy in 2 patients with refractory fungal keratitis. METHODS: Case reports and a review of the literature. Two cases of Fusarium keratitis refractory to topical and systemic antifungals were further treated with argon laser. Before laser treatment, the eye was medicated with proparacaine 0.5%, lidocaine 4%, and a single drop of fluorescein sodium 0.25%. Argon laser irradiation of the affected cornea was performed using argon blue-green wavelength (Coherent Ultima 2000; Coherent, Inc). A spot size of 500 µm, pulse duration of 0.10 seconds, and power ranging from 500 to 900 mW were used. RESULTS: During the first week after laser treatment, both patients showed complete resolution of the infiltrates. Two signs were observed during the procedure: a blanching of the corneal stroma and small cavitations that reached the middle stroma. No adverse effects were observed. CONCLUSIONS: Argon laser phototherapy is useful as an adjunctive treatment of refractory fungal keratitis. More cases are needed to validate our findings.
Assuntos
Úlcera da Córnea/radioterapia , Infecções Oculares Fúngicas/radioterapia , Fusariose/radioterapia , Fusarium/isolamento & purificação , Lasers de Gás/uso terapêutico , Terapia com Luz de Baixa Intensidade , Adulto , Idoso de 80 Anos ou mais , Antifúngicos/uso terapêutico , Farmacorresistência Fúngica , Humanos , Masculino , Acuidade Visual/fisiologiaRESUMO
PURPOSE: To evaluate the efficacy of corneal cross-linking (CXL) (riboflavin-UV-A) as a simple therapy in Fusarium keratitis. METHODS: Twenty-four rabbits were systemically anesthetized, and the stromata of their right corneas were inoculated with Fusarium solani [10(5) colony-forming units (CFU) per milliliter]. Rabbits were divided into 2 groups: one was treated with CXL 72 hours after infection and the other did not receive any treatment (control). All eyes in both the groups were examined before (days 0 and 3) and after (day 7) CXL treatment. The eyes were enucleated, and corneal buttons were sent for microbiological and histological examinations. RESULTS: All animals developed Fusarium keratitis; there was no statistically significant difference between groups before treatment (day 0, P = 0.397 and day 3, P = 0.702). After CXL treatment, the difference in clinical scores on day 7 between groups was statistically significant (P = 0.00); the CXL group showed significant lower clinical score. The CXL group had 22.45 ± 5.09 CFU/g compared with 42.5 ± 3.12 CFU/g in the control group; this difference was statistically significant (P = 0.01). In the 3 buttons of the control group, similar amounts of Fusarium hyphae and inflammatory cells were observed. In 2 of the 3 buttons analyzed from the CXL group, fewer Fusarium hyphae, inflammatory cells, and nonspecific stromal changes were observed compared with the control group. CONCLUSIONS: Treatment of fungal keratitis with CXL seems to be effective in decreasing the intensity and severity of infectious keratitis by F. solani. This therapy may be useful as a coadjuvant in the medical treatment of resistant infections.