RESUMO
OBJECTIVE: The aim of this study was to evaluate the impact of High Voltage Pulsed Current (HVPC) on the integration of total skin grafts in rats submitted to nicotine action. MATERIALS AND METHODS: For this purpose, 60 adult Wistar rats randomly distributed in 6 groups of 10 animals were analyzed. The electrical stimulation (anodic and cathodic stimulation, motor level, 30â¯min at 10â¯Hz; minimum voltage 20 µs and 100 µs pulse interval) was applied for seven days, starting on the third day after surgery and after the dressing was removed from the graft. RESULTS: Anodic HVPC promoted greater graft integration, demonstrating a lower percentage of tissue contraction, a lower number of inflammatory infiltrates and a greater amount of vascular endothelial growth factor (VEGF), as well as a higher number of newly formed blood vessels. CONCLUSIONS: HVPC can positively influence the integration of skin grafts in nicotine-treated rats. anodic HVPC is shown to promote greater integration in relation to a lower percentage of tissue contraction, a lower number of inflammatory infiltrates and a greater amount of vascular endothelial growth factor and newformed blood vessels. Whereas, the cathodic polarity has presented smaller amount of tissue gap.
Assuntos
Terapia por Estimulação Elétrica/normas , Nicotina/efeitos adversos , Transplante de Pele/normas , Análise de Variância , Animais , Modelos Animais de Doenças , Terapia por Estimulação Elétrica/métodos , Terapia por Estimulação Elétrica/estatística & dados numéricos , Masculino , Nicotina/uso terapêutico , Ratos , Ratos Wistar/lesões , Transplante de Pele/métodos , Cicatrização/efeitos dos fármacos , Cicatrização/fisiologiaRESUMO
The purpose of this study is to investigate the effect of pulsed electrical field (PEF) and photobiomodulation laser (PBM) on the viability of the TRAM flap in diabetic rats. Fifty Wistar rats were divided into five homogeneous groups: Group 1-control; Group 2-diabetics; Group 3-diabetics + PEF; Group 4-diabetic + laser 660 nm, 10 J/cm2, 0.27 J; Group 5-diabetic + laser 660 nm, 140 J/cm2, 3.9 J. The percentage of necrotic area was evaluated using software Image J®. The peripheral circulation of the flap was evaluated by infrared thermography FLIR T450sc (FLIR® Systems-Oregon USA). The thickness of the epidermis (haematoxylin-eosin), mast cell (toluidine blue), leukocytes, vascular endothelial growth factor, fibroblast and newly formed blood vessels were evaluated. For the statistical analysis, the Kruskal-Wallis test was applied followed by Dunn and ANOVA test followed by Tukey with critical level of 5% (p < 0.05). The PEF reduced the area of necrosis, decreased the leukocytes, increased the mast cells, increased the thickness of epidermis and increased newly formed blood vessels when it was compared to the untreated diabetic group of animals. Laser 660 nm, fluence 140 J/cm2 (3.9 J) showed better results than the 10 J/cm2 (0.27 J) related to reduction of the area of necrosis and the number of leukocytes, increased mast cells, increased thickness of the epidermis, increased vascular endothelial growth factor, increased fibroblast growth factor and increase of newly formed blood vessels in diabetic animals. The laser and pulsed electrical field increase the viability of the musculocutaneous flap in diabetic rats.
Assuntos
Diabetes Mellitus Experimental/patologia , Diabetes Mellitus Experimental/radioterapia , Eletricidade , Terapia com Luz de Baixa Intensidade , Retalho Miocutâneo/patologia , Animais , Sobrevivência Celular/efeitos da radiação , Fatores de Crescimento de Fibroblastos/metabolismo , Leucócitos/patologia , Leucócitos/efeitos da radiação , Masculino , Mastócitos/metabolismo , Mastócitos/patologia , Mastócitos/efeitos da radiação , Necrose , Ratos Wistar , Temperatura Cutânea/efeitos da radiação , Fator A de Crescimento do Endotélio Vascular/metabolismoRESUMO
Os autores descrevem o caso de um adolescente, que iniciou com quadro clínico de uveíte bilateral e aftas na mucosa oral aos 13 anos de idade. Nesse momento foi estabelecido o diagnóstico de doenca de Behcet, evoluindo dois anos após com hemiparesia aguda e deficit motor à direita. A ressonância magnética do crânio evidenciou sinais de vasculite em atividade. O tratamento inicial com ciclofosfamida não se mostrou eficaz, requerendo o uso de clorambucil e posteriormente da azatioprina oral. A doenca de Behcet apresenta envolvimento multissistêmico com manifestacões oculares, cutânea, ocular, intestinal, articular, vascular, urogenital e neurológica. As manifestacões neurológicas têm início mais freqüentemente na populacão adulta e excepcionalmente na infância e adolescência, representando uma importante causa de invalidez e morte.