Utilização de membrana amniótica canina como bandagem no tratamento de úlcera experimental da córnea estudo clínico, histológico e morfométrico em coelhos

• Autor(a) principal: Pontes, Kelly Cristine de Sousa
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5110
• topic: Membrana amniótica; Úlcera de córnea; Bandagem; Glicerina, Oftalmologia veterinária; Amniotic membrane; Corneal ulcer; Glycerin; Veterinary ophthalmology; Patch; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::CLINICA E CIRURGIA ANIMAL

The amniotic membrane has been widely used in the repair of corneal ulcers showing good results as it exhibits anti-adhesive effect and bacteriostatics properties, it protects the wound, reduces pain, participates in the epithelization and is not immunogenic. This membrane can be used on corneal ulcers as a graft or a patch depending on its position. A superficial keratectomy was made on all of the 28 animals included in this study. On the resulted corneal ulcer of the 14 animals of the treated group an amniotic membrane was used as patch sutured with its epithelial surface over the experimentally made ulcer. The control group did not receive the patch. The animals were submitted to clinical evaluations 24 hours after the proceedings, at a two-day interval during the first week and at a four-day interval from the second week until 180 days after surgeries. The histological and morphometric analysis were undertaken at 1, 2, 7, 15, 30, 60 e 180 days after surgery. The amniotic membrane s effect as a patch and its incorporation to the cornea were evaluated. The time needed for the corneal repair of the treated group was compared to the control and the time needed for the cornea s complete transparence was observed. Glycerin at 99% was evaluated as a preservation medium and the binocular magnifying glass was evaluated during surgeries. The corneal opacity was always present both in the treated and the control group during 180 days. The membrane retained the inflammatory cells on its surface and provided an improvement on the repair process at the beginning, but at some point it delayed this process and its conclusion. The membrane and the trauma caused by the suture needle leaded to discomfort, conjunctival congestion, ocular secretion and stimulated neovascularization and corneal fibrosis. There was no incorporation of the membrane to the cornea. The glycerin at 99% acted efficiently as a preservation medium when analyzing contamination, but its anti-angiogenesis characteristics were lost. The binocular magnifying glass was efficient during these works proceedings.