Toxicidade córneo-conjuntival do colírio de iodo-povidona: estudo experimental
PURPOSE: To evaluate ocular toxicity of povidone-iodine eye drops at a concentration of 2.5% and 0.5% and to investigate the effects on corneal epithelial wound healing and histopathological alterations. METHODS: Each group (PVP-I 2.5% and 0.5%) consisted of 20 rabbits. A central circular corneal ep...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2003 |
| País: | Brasil |
| Institución: | Universidade Federal de São Paulo (UNIFESP) |
| Repositorio: | Repositório Institucional da UNIFESP |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.unifesp.br:11600/1763 |
| Acceso en línea: | http://dx.doi.org/10.1590/S0004-27492003000300005 http://repositorio.unifesp.br/handle/11600/1763 |
| Access Level: | acceso abierto |
| Palabra clave: | Povidone-iodine Ophthalmic solutions Epithelium corneal Conjunctiva Animal experimentation Rabbits Povidona-iodo Soluções oftálmicas Epitélio da córnea Conjuntiva Experimentação animal Coelhos |
| Sumario: | PURPOSE: To evaluate ocular toxicity of povidone-iodine eye drops at a concentration of 2.5% and 0.5% and to investigate the effects on corneal epithelial wound healing and histopathological alterations. METHODS: Each group (PVP-I 2.5% and 0.5%) consisted of 20 rabbits. A central circular corneal epithelial defect of 6.5 mm diameter was created and the povidone-iodine eyedrops (2.5% and 0.5) instilled in the right eye and distilled water in the left eye (control) of each rabbit, every hour, during 3 days. Biomicroscopical examinations were performed every day, focussing on the corneoconjunctival surface and the diameter of the lesion, using fluoresceine eye drops, photodocumentation, and a computerized image analyzer. After the third day the rabbits were sacrified and the excised corneas histopathologically evaluated. Statistical evaluation was performed using Friedman, Mann-Witney, Wilcoxon, Fisher and Chi-squared tests. RESULTS: Povidone-iodine eye drops, at a concentration of 2.5%, caused an increase in the wound healing time (p= 0.087) and conjuntivitis in 100% of the eyes with mucous secretion in 80%, punctate ceratitis in 40%, and discrete stromal edema in 10% of the cases. The histopathological examination showed corneal ulcers and vacuolic degeneration of the endothelial layer in 100%, as well as an inflammatory infiltrate with eosinophils in 80% of the cases. The eyes treated with povidone-iodine eye drops at a concentration of 0.5% and the control eyes showed complete epithelial wound healing after 72 hours, and histopathologically normal epithelization. Only in one case, a discrete perilimbar leucocytic infiltrate was observed. CONCLUSION: The ocular toxicity of povidone-iodine eye drops is concentration-dependent. The use of the eye drop at a concentration of 2.5% is not adequate for daily and repetitive use. In contrast, at a concentration of 0.5% no toxicity was observed. |
|---|