Uso do LED vermelho em mucosite induzida por quimioterapia
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Data
2007-03-29
Autores
Sacono, Nancy Tomoko [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A mucosite é uma das complicações orais mais incidentes relacionadas à quimioterapia, que provoca ulcerações, dor, dificuldade de alimentação e pode levar à interrupção do tratamento antineoplásico. O objetivo deste estudo foi testar o efeito do LED (Ligth Emitting Diode) no tratamento da mucosite induzida por quimioterapia em hamsters. Os animais do grupo experimental (G1) e do grupo controle (G2) receberam injeção de 5-fluoruracila nos dias 0 e 2 do experimento e tiveram as mucosas direita e esquerda arranhadas nos dias 3 e 4. O G1 recebeu tratamento com LED (630 nm, 160 mW, 12 J/cm2) durante 37,5 segundos nos dias 3, 4, 6, 8, 10, 12 e 14. A mucosa jugal foi evertida e fotografada a cada dois dias a partir do dia 4 até o dia 14. As fotografias foram classificadas por meio de uma escala de acordo com o grau de severidade da mucosite (0 a 5). O G2 não recebeu tratamento. O grupo controle negativo (G3) não foi submetido à indução de mucosite. Nos dias 5, 9, 13 e 14, as mucosas de 8 animais (G1 e G2) foram removidas para avaliação histopatológica. A análise estatística demonstrou haver diferenças significantes entre o grupo tratado com LED e o grupo não tratado (p<0,05) quando se comparou a severidade da mucosite, apesar de a avaliação histopatológica ter demonstrado degeneração muscular em aproximadamente 18% da amostra (G1). A aplicação do LED nos parâmetros utilizados neste estudo foi efetiva na redução da severidade da mucosite oral e na cicatrização das lesões, embora não tenha prevenido completamente o surgimento das mesmas.
Mucositis is the most common oral complication of cancer chemotherapy that causes pain and impairs patient's ability to eat, swallow and may determine interruption of the treatment. The aim of this study was to evaluate the effect of LED (Ligth Emitting Diode) therapy on chemotherapy-induced mucositis in hamsters. The animals of both experimental (G1) and positive control group (G2) received intraperitoneal injections of 5-fluorouracil on days 0 and 2. All animals had right and left oral mucosa irritated by superficial scratching on days 3 and 4. The G1 received LED irradiation (630 nm, 160 mW, 12 J/cm2) during 37,5 seconds at days 3, 4, 6, 8, 10, 12 and 14. The cheek pouches were everted and photographed from day 4 until 14 at 2-day intervals. Photographs were randomly scored according to the severity of induced mucositis (0 to 5). The G2 received no treatment. The negative control group (G3) received no mucositis induction. The cheek pouches of 8 animals (G1 and G2) were dissected for histopathological examination on days 5, 9, 13 and 15. The statistical analysis showed significant differences between treated and non-treated groups (p<0,05), although histopathological findings have demonstrated muscular degeneration in 18% of the sample (G1), approximately. These results pointed out that LED therapy protocol established for this study was effective to reduce the severity of oral mucositis and accelerated the healing process, although it has not completely prevented the appearance of oral lesions.
Mucositis is the most common oral complication of cancer chemotherapy that causes pain and impairs patient's ability to eat, swallow and may determine interruption of the treatment. The aim of this study was to evaluate the effect of LED (Ligth Emitting Diode) therapy on chemotherapy-induced mucositis in hamsters. The animals of both experimental (G1) and positive control group (G2) received intraperitoneal injections of 5-fluorouracil on days 0 and 2. All animals had right and left oral mucosa irritated by superficial scratching on days 3 and 4. The G1 received LED irradiation (630 nm, 160 mW, 12 J/cm2) during 37,5 seconds at days 3, 4, 6, 8, 10, 12 and 14. The cheek pouches were everted and photographed from day 4 until 14 at 2-day intervals. Photographs were randomly scored according to the severity of induced mucositis (0 to 5). The G2 received no treatment. The negative control group (G3) received no mucositis induction. The cheek pouches of 8 animals (G1 and G2) were dissected for histopathological examination on days 5, 9, 13 and 15. The statistical analysis showed significant differences between treated and non-treated groups (p<0,05), although histopathological findings have demonstrated muscular degeneration in 18% of the sample (G1), approximately. These results pointed out that LED therapy protocol established for this study was effective to reduce the severity of oral mucositis and accelerated the healing process, although it has not completely prevented the appearance of oral lesions.
Descrição
Palavras-chave
Fototerapia, Tumores, Quimioterapia, Fluoracila, Mucosa bucal, Photherapy, Neoplasms, Drug therapy, Fluorouracil, Oral mucosa
Como citar
SACONO, Nancy Tomoko. Uso do LED vermelho em mucosite induzida por quimioterapia. 2007. 160 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2007.