Efeitos do laser de baixa intensidade infravermelho sobre a inflação pulmonar em modelo experimental de sepse
Data
2017
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
A sepse é definida como presença de disfunção orgânica ameaçadora à vida, secundária à
resposta desregulada do organismo à infecção. A síndrome do desconforto respiratório agudo
(SDRA) comumente relaciona-se com a sepse e tem associação com altas taxas de
mortalidade. A terapia laser de baixa intensidade (LLLT) é um recurso complementar e não
invasivo utilizado para fins terapêuticos, como um tratamento seguro e efetivo. Estudos
demonstram que a LLLT reduz o número de células inflamatórias e de enzimas responsáveis
pela liberação de fatores quimiotáticos na fase inicial da inflamação. Além disso, há um
aumento dos níveis de enzimas antioxidantes em vários modelos de patologias inflamatórias.
Desta forma, o objetivo do estudo foi avaliar e comparar os efeitos da LLLT sobre a
inflamação pulmonar induzida pela sepse em ratos por meio da técnica de ligadura e
perfuração cecal (CLP). Foram utilizados 16 ratos Wistar, machos, com três meses de idade e
massa corporal média de 300 ± 20 g, divididos em dois grupos: (S) Sepse - indução da sepse e
eutanásia 24 h após indução; (SLI) Sepse e laser 830 nm- indução da sepse, tratamento com
LLLT no comprimento de onda infravermelho. A irradiação foi realizada imediatamente após
a cirurgia nas seguintes regiões: região anterior da traqueia e nas regiões ventrais do tórax,
bilateralmente, logo abaixo das costelas. Foi realizada a análise do LBA (lavado
broncoalveolar) e a análise histológica do tecido pulmonar. Os resultados demonstraram que o
grupo SLI apresentou uma diminuição do número de células inflamatórias quando comparado
ao grupo S tanto no LBA quanto na análise histológica do tecido pulmonar. Estes resultados
sugerem que a LLLT influencia diretamente a modulação da resposta inflamatória pulmonar
secundária à sepse. No entanto, é necessária uma análise mais aprofundada para esclarecer os
possíveis efeitos terapêuticos da LLLT neste modelo de sepse.
Sepsis is defined as the presence of life-threatening organ dysfunction due to dysregulated host response to infection. Acute Respiratory Distress Syndrome (ARDS) is related with sepsis and also has high mortality rate. Low-Level Laser Therapy (LLLT) is a non-invasive complementary resource, which is considered as a safe and effective device for treatment. It is well stablished in the literature that LLLT can decrease the inflammatory cells and enzymes responsible for releasing chemotactic factors in early stages of inflammation. Furthermore, it is capable of increasing the levels of antioxidant enzymes in various models of inflammatory pathologies. The objective of the study was to evaluate and compare the effects of LLLT on pulmonary inflammation induced by sepsis through cecal ligation and puncture (CLP) model on rats. Sixteen male Wistar rats with three months old and average body mass of 300 ± 20 g were selected for the present study. The experimental models were distributed into two groups which were identified as sepsis group (S) with induced sepsis and euthanasia 24 hours post sepsis induction, and sepsis and laser 830 nm group (SLI) which received induced sepsis, LLLT treatment with infrared wavelenght. Laser irradiation was applied after surgery on trachea's anterior part and thorax's ventral part, bilaterally right bellow the ribs. Bronchoalveolar lavage (BAL) and pulmonary tissue histology analyses were made. The results of BAL analysis presented a decrease in the amount of inflammatory cells on SLI group when compared to S group. These findings suggest the direct effect of LLLT on modulation of inflammatory response due to sepsis. However, further analysis is required to understand the therapeutic effects of LLLT on this type of sepsis model
Sepsis is defined as the presence of life-threatening organ dysfunction due to dysregulated host response to infection. Acute Respiratory Distress Syndrome (ARDS) is related with sepsis and also has high mortality rate. Low-Level Laser Therapy (LLLT) is a non-invasive complementary resource, which is considered as a safe and effective device for treatment. It is well stablished in the literature that LLLT can decrease the inflammatory cells and enzymes responsible for releasing chemotactic factors in early stages of inflammation. Furthermore, it is capable of increasing the levels of antioxidant enzymes in various models of inflammatory pathologies. The objective of the study was to evaluate and compare the effects of LLLT on pulmonary inflammation induced by sepsis through cecal ligation and puncture (CLP) model on rats. Sixteen male Wistar rats with three months old and average body mass of 300 ± 20 g were selected for the present study. The experimental models were distributed into two groups which were identified as sepsis group (S) with induced sepsis and euthanasia 24 hours post sepsis induction, and sepsis and laser 830 nm group (SLI) which received induced sepsis, LLLT treatment with infrared wavelenght. Laser irradiation was applied after surgery on trachea's anterior part and thorax's ventral part, bilaterally right bellow the ribs. Bronchoalveolar lavage (BAL) and pulmonary tissue histology analyses were made. The results of BAL analysis presented a decrease in the amount of inflammatory cells on SLI group when compared to S group. These findings suggest the direct effect of LLLT on modulation of inflammatory response due to sepsis. However, further analysis is required to understand the therapeutic effects of LLLT on this type of sepsis model
Descrição
Citação
JANEIRO, Juliana Galdino. Efeitos do laser de baixa intensidade infravermelho sobre a inflação pulmonar em modelo experimental de sepse. 2017. 25 f. Trabalho de conclusão de curso de graduação (Fisioterapia) - Instituto de Saúde e Sociedade (ISS), Universidade Federal de São Paulo (UNIFESP), Santos, 2017.