4 research outputs found
Ação do dimetil-sulfóxido na isquemia de retalhos randômicos de pele em ratos The role of subcutaneous methyl-sulfoxide in a morphological study of random skin flaps in rats
Objetivo: Avaliar a ação do dimetil-sulfóxido (DMSO) na necrose distal de retalhos randômicos isquêmicos em ratos. Métodos: Foram utilizados 30 ratos machos, linhagem Wistar, peso entre 220 e 363g e idade média de 3 meses. O retalho cutâneo dorsal (8x2cm) com pedÃculo cranial foi descolado, reposto em seu leito e suturado com poliamida 4.0. O grupo controle-CT (n=10) não recebeu nenhuma medicação, o grupo simulado-SM (n=10) recebeu o volume de 1mL de solução salina subcutânea, dividida em dez aplicações ao longo do retalho, o grupo experimento-EX (n=10) recebeu a injeção de 1ml de DMSO 5%. Após sete dias foram avaliadas as áreas de necrose distal e colhido material para o estudo histológico. Resultados: As medidas das áreas de necrose (CT=47,99, SM=58,78, EX=41,57) e as porcentagens das áreas de necrose (CT=29,98, SM=36,73, EX=23,99) mostraram-se menores no grupo Ex (p< 0,05). O estudo histológico qualitativo mostrou, no grupo Ex, maior presença de neovascularização, menor desestruturação dos anexos e do estroma conjuntivo e presença de fibroblastos em perÃodo mais precoce que nos dois outros grupos. Conclusão: O DMSO teve ação benéfica sobre os retalhos cutâneos randômicos em ratos, expressos pela menor área de necrose distal e pelo aspecto histológico de reparação tecidual mais precoce.<br>Purpose: To evaluate through the morphologic study (macro and microscopic) the effectiveness of DMSO in the genesis of the distal necrosis of random skin flaps in rats. Methods: 30 male rats were used, lineage Wistar, weight between 220 and 363g and 3 months medium age .The skin flap (8x2cm) with remained cranial vessels it was unstuck, restored at his bed and sutured with polyamide 4.0. The control-group CT (n=10) don’t received any medication, the simulated group -SM (n=10) it received the volume of 1mL of subcutaneous saline solution, divided in ten applications along the skin flap, the experiment group (n=10) it received the injection of 1ml of DMSO5%. After seven days they were appraised the areas of distal necrosis and picked material for the histology study. Results: The measures of the necrosis areas (CT=47.99, SM=58.78, EX=41.57) and the percentages of the necrosis areas (CT=29.98, SM=36.73, EX =23.99) they were shown smaller in the EX group (p < 0,05). The qualitative histology study showed, in the group EX, larger angiogenic presence, smaller destruction of the enclosures and of the conjunctive stroma and presence of fibroblasts in more precocious period than in the two other groups. Conclusion: The analysis of the collected data can infer that DMSO had beneficial action on the random skin flaps, expressed by the smallest area of distal necrosis and for the histology aspect of repairing tissue more precocious
Tracheotomy in growing rats: histological aspects
PURPOSE: To compare morphologically three different types of tracheotomy in growing rats, applying microsurgical technique. METHODS: EPM-1 Wistar growing rats (n=57) weighing 88gm and aged 35 days were randomized in four groups, according tracheotomy incision type (longitudinal, transverse and tracheal segment excision), and sham group. Following intramuscular anesthesia with ketamine and xylazine, the trachea was exposed and incised, according to the group, and a hand-made endotracheal cannula was inserted into the organ, under sterile conditions. This cannula was removed after 7 days, and animals have been sacrificed 30 days later. Tracheas samples were submitted to histological study, stained by hematoxylin-eosin and Masson trichrome, evaluating fibrosis, inflammatory infiltrate and epidermoid metaplasia. RESULTS: There was more frequency of inflammatory infiltrate at the tracheal epithelium in the tracheal segment excision group (87%) compared to the longitudinal (40%) and transverse (36%) incision groups (p=0.009). Evaluating epidermoid metaplasia, tracheal segment excision and the longitudinal groups presented 33% and 40%, respectively, compared to 0% of the transverse group (p=0.03). Concerning to fibrosis, in a global comparison (p=0.1) among the three groups there was no difference, however, compared to the longitudinal group the transverse group showed lower level of fibrosis (p=0.04). Sham group did not present any relevant morphologic alterations and it was used as reference pattern. CONCLUSION: Taken together, our data show that tracheal segment excision promotes more epithelium aggression and transverse tracheal incision shows less morphologic alterations
Traqueostomia no rato em crescimento: aspectos histológicos
PURPOSE: To compare morphologically three different types of tracheotomy in growing rats, applying microsurgical technique. METHODS: EPM-1 Wistar growing rats (n=57) weighing 88gm and aged 35 days were randomized in four groups, according tracheotomy incision type (longitudinal, transverse and tracheal segment excision), and sham group. Following intramuscular anesthesia with ketamine and xylazine, the trachea was exposed and incised, according to the group, and a hand-made endotracheal cannula was inserted into the organ, under sterile conditions. This cannula was removed after 7 days, and animals have been sacrificed 30 days later. Tracheas samples were submitted to histological study, stained by hematoxylin-eosin and Masson trichrome, evaluating fibrosis, inflammatory infiltrate and epidermoid metaplasia. RESULTS: There was more frequency of inflammatory infiltrate at the tracheal epithelium in the tracheal segment excision group (87%) compared to the longitudinal (40%) and transverse (36%) incision groups (p=0.009). Evaluating epidermoid metaplasia, tracheal segment excision and the longitudinal groups presented 33% and 40%, respectively, compared to 0% of the transverse group (p=0.03). Concerning to fibrosis, in a global comparison (p=0.1) among the three groups there was no difference, however, compared to the longitudinal group the transverse group showed lower level of fibrosis (p=0.04). Sham group did not present any relevant morphologic alterations and it was used as reference pattern. CONCLUSION: Taken together, our data show that tracheal segment excision promotes more epithelium aggression and transverse tracheal incision shows less morphologic alterations.OBJETIVO: Comparar os aspectos histológicos da cicatrização traqueal após diferentes tipos de traqueotomia nos ratos em crescimento, usando técnica microcirúrgica. MÉTODOS: Ratos EPM-1 Wistar (n=57), em crescimento, com peso médio de 88g e idade de 35 dias foram distribuÃdos randomicamente em quatro grupos de acordo com o tipo de incisão traqueal (longitudinal, transversa e com retirada de fragmento de anel cartilaginoso) e grupo simulado. Sob anestesia intramuscular (cetamina/xilazina), usando técnica asséptica, a traquéia era exposta e aberta, de acordo com o grupo, sendo introduzida uma cânula confeccionada em silicone. Esta cânula foi removida no 7º dia e após 30 dias os animais foram submetidos à eutanásia. As traquéias retiradas foram submetidas a estudo histológico, nas colorações H-E e tricrômico de Masson, avaliando-se fibrose, infiltrado inflamatório no epitélio traqueal e metaplasia epidermóide. RESULTADOS: Houve mais infiltrado inflamatório ao epitélio traqueal no grupo em que se retirou um segmento traqueal um (87%) comparado aos das incisões longitudinal (40%) e transversa (36%)(p=0,009). Avaliando a metaplasia epidermóide, os grupos com excisão de segmento traqueal e da incisão longitudinal apresentaram 33% e 40%, respectivamente, comparado a 0% do grupo com incisão transversa (p=0,03). No que se refere à fibrose, numa comparação entre os três tipos de incisão não houve diferença significante (p=0,1), entretanto, ao se comparar ao grupo de incisão longitudinal, o grupo da incisão transversa mostrou menor nÃvel de fibrose (p=0,04). O grupo simulado não apresentou qualquer alteração histológica e foi utilizado como padrão de referência. CONCLUSÃO: Nossos dados mostraram que a incisão com excisão de segmento traqueal promove maior agressão epitelial e a incisão transversa apresenta menor grau de alterações histológicas.UNIFESP-EPMUNIFESP-EPM Department of SurgerySanta Casa Medical Sciences Faculty Department of PathologyUNIFESP-EPM Department of EpidemiologyUNIFESP, EPM, Department of SurgeryUNIFESP, EPM Department of EpidemiologySciEL