Estudo clínico e anatomopatológico da cicatrização cutânea no gato doméstico: utilização do laser de baixa potência GaAs (904 nm)

Free omental graft without vascular microanastomosis in the cutaneous wound healing of rabbits

ABSTRACT This study aims to evaluate the influence of free omental graft without vascular microanastomosis (FOGWVA) on experimental skin healing in rabbits. Through celiotomy, a 9cm2 free omental fragment was collected in 36 rabbits, with subsequent production of a deep linear cutaneous wound in the dorsal midline measuring 3cm. In 18 animals from the omental group (OG), the omental fragment collected was fixed subcutaneously with six simple interrupted stitches using a 4-0 polyamide thread. In both treated and control (CG) groups, intradermal dermorrhaphy was performed with 4-0 polyamide thread. Experimental wounds were clinically evaluated every day. Each of the groups was divided into three subgroups of 6 animals each for histopathological evaluation on the 7th, 14th, and 28th days of postoperative. In the OG wounds, the increase in volume (omentum activation) stood out after the second postoperative day. Macroscopy showed an organic reaction to the graft on day 7, with a progressive reduction in addition to neovascularization towards the omental graft. The intense presence of mononuclear cells and collagen deposition on day 7 demonstrated an accelerated process of tissue remodeling and repair. The FOGWVA omental graft remained viable and positively influenced the cutaneous healing of the experimental wounds in rabbits.

Analysis of the healing process of the wounds occurring in rats using laser therapy in association with hydrocolloid

PURPOSE

To evaluate wound healing in rats by using low-level laser therapy (LLLT) associated with hydrocolloid occlusive dressing.

METHODS

Forty male, adult, Wistar rats were used, distributed into four groups: LG (received 2 J/cm² of laser therapy); HG (treated with hydrocolloid); LHG (treated with 2 J/cm² of laser therapy and hydrocolloid); and the CG (treated with 1 mL of 0.9% saline). The wound was evaluated at pre-determined periods 3rd and 7th days, considering the macroscopic and histological parameters (inflammatory cells, capillary neoformation, fibroblasts, collagen formation and reepithelialization).

RESULTS

The LG group at seven days showed increased collagen formation, the LHG group at 3 days showed mild collagen formation. The HG group and the CG at 7 days showed complete reepithelialization.

CONCLUSION

Low-level laser therapy as well as the hydrocolloid dressing have favored the wound-healing process in rats.

Uso do laser arseneto de gálio (904nm) após excisão artroplástica da cabeça do fêmur em cães

OBJETIVO: Avaliar a ação do laser diodo Arseneto de Gálio na evolução pós-operatória de cães submetidos à excisão artroplástica da cabeça e colo do fêmur. MÉTODOS: Treze cães portadores de Legg-Calvé-Perthes Disease ou Necrose Asséptica da Cabeça do Fêmur (NACF) foram divididos em dois grupos: (I) sete cães que não foram irradiados - grupo controle; (II) seis cães irradiados uma vez ao dia durante cinco dias consecutivos com o laser Arseneto de Gálio (904nm), densidade de energia 4J/cm2 e tempo de exposição automaticamente ajustado pelo aparelho. Para a avaliação da evolução pós-operatória preencheu-se protocolo com graduação da dor de apoio do membro operado. Utilizou-se teste estatístico não paramétrico U de Mann-Whitney para análise dos resultados. RESULTADOS: O grupo I iniciou o apoio do membro com uma média de 12 dias de pós-operatório e o grupo II com uma média de quatro dias de pós-operatório, sendo estatisticamente significante (p=0.0012). CONCLUSÃO: A irradiação com o laser de baixa potência Arseneto de Gálio (904nm) na dose 4J/cm2, periarticular, promoveu rápido retorno da função do membro em cães após a excisão artroplástica da cabeça do fêmur, otimizando a recuperação pós-operatória.