Estimulação elétrica nervosa transcutânea de alta e baixa frequências nos vasos sanguíneos e nos miofibroblastos de ferida excisional aguda em pele de ratos
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Data
2013
Autores
Machado, Aline Fernanda Perez [UNIFESP]
Orientadores
Hochman, Bernardo [UNIFESP]
Tipo
Dissertação de mestrado
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Introdução: Os efeitos da Estimulacao Eletrica Nervosa Transcutanea (TENS) no processo de cicatrizacao de feridas tem sido estudados para determinar os principais eventos responsaveis pelo reparo tecidual. Objetivo: Avaliar o efeito da TENS de alta e de baixa frequencias nos vasos sanguineos e nos miofibroblastos de ferida excisional aguda em pele de ratos. Metodos: Foram utilizados 90 ratos (Wistar-EPM1) machos e adultos. Realizou-se uma ferida excisional na regiao dorsal do animal utilizando um punch medindo 8 milimetros. Os animais foram aleatorizados em 3 grupos: Grupo Alta frequencia (GA: 80 Hz), Grupo Baixa frequencia (GB: 5 Hz) e Grupo Simulado (GS: TENS desligada); e submetidos a TENS por 3 dias consecutivos. A duracao do pulso e intensidade da corrente foram 200 μs e 15 mA, respectivamente; durante 60 minutos. Foram realizadas analises imunohistoquimicas para quantificacao dos vasos sanguineos e dos miofibroblastos, aos 3, 7 e 14 dias de PO. Resultados: Aos 3 dias de PO, o GB apresentou maior quantidade de vasos sanguineos em relacao ao GA; aos 7 e 14 dias de PO, o GA demonstrou menor quantidade de vasos sanguineos em relacao ao GS. O GA apresentou menor quantidade de miofibroblastos comparado com o GB e o GS aos 3 dias de PO e comparado ao GS aos 7 dias de PO. Conclusao: A TENS de baixa frequencia aumentou a quantidade de vasos sanguineos aos 3 dias de PO e a de alta frequencia inibiu os vasos sanguineos e os miofibroblastos de ferida excisional aguda em pele de ratos
Introdution: The effects of Transcutaneous Electrical Nerve Stimulation (TENS) on the wound healing process have been studying to verify the most important events to tissue repair. Objective: To assess the effect of high- and low-frequency TENS on the angiogenesis and myofibroblasts of acute excisional wounds in rats’ skin. Methods: Ninety young adult male EPM1-Wistar rats were used in the study. An excisional wound was performed on the back of each animal using an 8-mm punch. The animals were randomly assigned to three groups: the High-frequency Group (HG: 80 Hz), Low-frequency Group (LG: 5 Hz), and Sham Group (SG: TENS turned off). TENS was delivered on three days: in the immediate postoperative period and on two consecutive days. Pulse duration and current intensity were 200 µs and 15 mA, respectively. The length of each TENS session was 60 minutes. Microscopic analyses were taken to quantify the blood vessels and myofibroblasts on postoperative days 3, 7, and 14. Results: On postoperative day 3, the LG showed more angiogenesis than HG; on the postoperative days 7 and 14, the LG inhibited the angiogenesis compared to SG. On postoperative day 3, the HG inhibited the myofibroblasts compared to LG and SG, and on the postoperative day 7 compared to SG only. Conclusions: Low-frequency TENS increased the angiogenesis on postoperative day 3 and the highfrequency TENS inhibited the angiogenesis and myofibroblasts of acute excisional wounds in rats’ skin.
Introdution: The effects of Transcutaneous Electrical Nerve Stimulation (TENS) on the wound healing process have been studying to verify the most important events to tissue repair. Objective: To assess the effect of high- and low-frequency TENS on the angiogenesis and myofibroblasts of acute excisional wounds in rats’ skin. Methods: Ninety young adult male EPM1-Wistar rats were used in the study. An excisional wound was performed on the back of each animal using an 8-mm punch. The animals were randomly assigned to three groups: the High-frequency Group (HG: 80 Hz), Low-frequency Group (LG: 5 Hz), and Sham Group (SG: TENS turned off). TENS was delivered on three days: in the immediate postoperative period and on two consecutive days. Pulse duration and current intensity were 200 µs and 15 mA, respectively. The length of each TENS session was 60 minutes. Microscopic analyses were taken to quantify the blood vessels and myofibroblasts on postoperative days 3, 7, and 14. Results: On postoperative day 3, the LG showed more angiogenesis than HG; on the postoperative days 7 and 14, the LG inhibited the angiogenesis compared to SG. On postoperative day 3, the HG inhibited the myofibroblasts compared to LG and SG, and on the postoperative day 7 compared to SG only. Conclusions: Low-frequency TENS increased the angiogenesis on postoperative day 3 and the highfrequency TENS inhibited the angiogenesis and myofibroblasts of acute excisional wounds in rats’ skin.
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MACHADO, Aline Fernanda Perez.Estimulação elétrica nervosa transcutânea de alta e baixa frequências nos vasos sanguíneos e nos miofibroblastos de ferida excisional aguda em pele de ratos, 2013. 87 f. Dissertação (Mestrado em Ciências) - Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2013.