Reparação de feridas cutâneas incisionais em coelhos após tratamento com barbatimão e quitosana
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Data
2010-02-25
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Universidade Federal de Goiás
Resumo
In veterinary medicine, skin injuries represent a significant casuistry and require expensive therapies, considerable recovery time and often lead to unfavorable resolution. To establish an effective therapeutic protocol it is essential that the professional has a solid knowledge of the healing dynamic, as its phases, triggered events, features, as well as about the biological potential of the healing process coadjutants. Regarding these ones, it is known that phytotherapy has a wide range of botanical specimens with healing potential, and, among them, the barbatiman, native species of the Brazilian cerrado, by its antiseptic and astringent activities, becomes an attractive option for skin injures therapies. The chitosan biomaterial also has potential as coadjutant of the process, once it accelerates the triggering of the healing stages by its immunomodulatory property. To clarify the mechanism
proposed by these agents, numerous tests are developed using laboratory animals, in order to give reliability to the therapy modality established. To follow clinical evolution in vivo, the clinical examination becomes essential, while
morphometric analysis provide accurate data regarding the percentage of centripetal contraction of the lesions. Finally, the microscopic analysis is used to analyze the ultrastructure of the injured site, predominant kinds of cells in each stage and microscopic events triggered on the search for the morphofunctional restoration of the affected tissue. Considering it, with the development of this study it was aimed to evaluate the activity of 5% barbatiman cream (CB) and 5% chitosan cream (CQ) based therapeutic formulations, on the healing process of incisional skin wounds undergone healing by secondary intention, with rabbit as experimental model. In the first chapter it was performed a wide and detailed literature review about the topic of the study, which involved description of the target tissue, skin, hysiopathology of the healing process, barbatiman phytotherapic and chitosan biomaterial activities as healing coadjutants, use of
laboratory animals in scientific research and evaluation methods of skin therapies. In the second chapter, it was tested the therapeutic activity of CB and CQ on healing of incisional cutaneous wounds with rabbit as experimental model, by daily clinical evaluation and morphometric analysis performed on days three, seven, 14 and 21 post-injury. There were performed four wounds on each animal, totaling 40
rabbits. Daily, all lesions of each animal received a specific topical therapy, which lasted for 21 consecutive days. First, we performed the antiseptic with 0.9% sodium chloride solution e and further applied treatment protocols themselves. In one of the protocols employed in cream barbatiman (CQ) in another cream chitosan (QC), and these were formulations tests. In the third protocol was the use of allantoin cream (positive control) and finally the cream neutral vehicle (negative control I). In other injury effected only without topical antiseptic and associated 0.9% sodium chloride solution (negative control II). The results showed that the
CB and CQ contributed to the satisfactory progress of the healing process. Although there has been no statistical differences in the contraction percentage between the two treatments (CB and CQ), it was clinically observed that the
wounds treated with CB showed better clinical responses than CQ. In the third chapter it was comparatively performed, by clinical and microscopic evaluations, the analysis of the action of CQ and CB in the wounds of the same animals that received the treatments from chapter two. For histological analysis, there were considered the predetermined period for morphometry and the samples were evaluated regarding the prevalence of polymorphic and mononuclear infiltrate,
presence of necrosis, crust, granulation tissue, fibroplasia, angiogenesis, collagenization and skin reepithelialization. From the results obtained it can be affirmed that the activities attributed to barbatiman and chitosan contributed similarly to the satisfactory progress of the healing process, once both treatments did not differ significantly for any parameter considered in this study. It is suggested that therapeutic protocols chitosan and barbatiman based provided acute inflammation reduction, as much as promoted fibroblast activation, early development of connective tissue, neovascularization and tissue reepithelialization, providing proved effective and economically viable alternatives in the healing process.
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Palavras-chave
Biomaterial , fitoterapia , histologia , lagomorfo , morfometria , pele , reparação tecidual , Biomaterial , phytotherapy , histology , lagomorph , morphometry , skin , tissue repair
Citação
LIMA, Caroline Rocha de Oliveira. Repair of incisional wounds in rabbits after treatment with chitosan and barbatimão. 2010. 105 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.