Purpose:To assess the viability of McFarlane skin flaps in rats with administration of sildenafil. Methods: Twenty Wistar rats were distributed into two groups: Control (dorsal skin flap, subdermal application of saline solution at 0.9%) and Study (dorsal skin flap, subdermal application of sildenafil). Seven days after the surgery, flaps were photographed and graphically rendered. Then, they were analyzed with AutoCAD software. Three biopsies (proximal, medial and distal) of each flap were collected for histological analysis. Results: Macroscopic analysis showed that animals of the study group had greater necrotic areas (p=0.003) in the dorsal skin flaps. Additionally, histological analysis of the distal third of these flaps showed a tendency to less granulated tissue formation in animals treated with sildenafil. Conclusion: Sildenafil subdermally was associated with lower viability of the random skin flap in rats. Key words: Wound Healing. Surgical Flaps. Cyclic GMP. Nitric Oxide. Rats. RESUMOObjetivo: Avaliar a viabilidade de retalhos cutâneos de ratos à McFarlane após a administração de sildenafil. Métodos: Vinte ratos Wistar foram distribuídos em dois grupos: Controle (confecção do retalho cutâneo dorsal, aplicação subdérmica de solução salina a 0,9%) e Estudo (confecção do retalho cutâneo dorsal, aplicação subdérmica de sildenafil). Sete dias após a operação, os retalhos foram fotografados e representados graficamente, para serem analisados com o programa AutoCad. Três biópsias (cranial, média e caudal) foram coletadas de cada retalho, para análise histológica. Resultados: A análise macroscópica evidenciou que os animais do grupo Estudo apresentaram maiores áreas de necrose (p=0,003) nos retalhos cutâneos dorsais. Além disso, a análise histológica dos terços distais dos retalhos mostrou uma tendência à formação de menos tecido de granulação nos animais que receberam o sildenafil. Conclusão: O sildenafil subdérmico esteve associado com uma pior viabilidade tecidual dos retalhos cutâneos dorsais de ratos. Descritores: Cicatrização de Feridas. Retalhos Cirúrgicos. GMP Cíclico. Óxido Nítrico. Ratos.
PURPOSE:To investigate the effects of chlorhexidine on the formation of adhesions and dilation of the colon at the oral end of anastomosis in the presence of peritonitis. METHODS:Peritonitis was induced in male Wistar rats by cecal ligation and puncture (CLP). Abdominal cavities were irrigated with tepid solutions containing 0.9% saline (SAL group; n = 8) or 0.05% chlorhexidine (CHD group; n = 8), after which colon anastomoses were performed. Control rats (n = 8) were submitted to colon anastomoses but not to CLP. Animals were euthanised seven days after surgery and the incidence of adhesions, the degree of dilation of colon loops and an index were calculated to determine variables correlation. RESULTS:No animals exhibited macroscopic signs of residual peritonitis or abdominal abscesses. Adhesions were observed in 75% of control and 100% of SAL and CHD animals. Dilation of intestinal loops at the oral end of anastomosis was observed in control (50%), SAL (57.2%) and CHD (66.7%) animals. The calculated index was 1.25 in group A; 1.86 in group B; and 2.0 group C. CONCLUSION:Chlorhexidine promoted stronger adhesions and a greater dilatation of colonic loops than control group.
Peritoneal irrigation with chlorhexidine solution is effective in the control of inflammation promoted by peritonitis but does not improve healing of colon anastomosis in rats.
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