Abstract

OBJETIVOS: Determinar modelo de contusão medular padronizado e método de avaliação motora em ratos com quadro de paraplegia. MÉTODOS: Utilizados 20 ratos Wistar divididos em quatro grupos, diferenciado o nível de gravidade da lesão raquimedular; realizadas lesões intermediárias padronizadas, através do sistema "MASCIS IMPACTOR" (Multicenter Animal Spinal Cord Injury Study): grupo 1 - 12,5 mm (lesão leve); grupo 2 - 25 mm (lesão moderada); grupo 3 - 50 mm (lesão grave); grupo 4 - animais que não sofreram lesão (grupo controle). Após 48 horas foi avaliada função motora, segundo escala proposta por Basso, Beattie e Bresnahan. RESULTADOS: Utilizando o modelo, notamos que as contusões leves (12,5mm de altura) foram efetivas, e os animais apresentaram infecção urinária na fase aguda uma semana após a contusão. As contusões intermediárias (25 mm de altura) foram efetivas, os animais apresentaram infecção urinária até duas semanas após a contusão. As contusões graves (50mm de altura) foram efetivas, os animais apresentaram infecção urinária durante três a quatro semanas e autofagia. CONCLUSÃO: O modelo de lesão medular utilizando o sistema MASCIS IMPACTOR e a avaliação funcional proposta por Basso, Beattie e Bresnahan é reprodutível, podendo ser utilizada, propiciando troca de informações entre os diferentes pesquisadores.

Highlights

  • Experimental models have been used to accumulate experiences and to improve and refine knowledge about spinal cord injury physiopathology.[1,2,3] This knowledge applied to clinical and surgical treatments is used to reduce morbidity and mortality in patients with spinal cord injury.[4]

  • The objective of this study is to evaluate, using the BBB scale, the severity of lesions at different levels of height made using a standardized experimental spinal cord injury model known as a the “Mascis Impactor”

  • The lesions were produced in compliance with the international protocol MASCIS (Multicenter Animal Spinal Cord Injury Study), a model that produces spinal cord contusions at different levels, which determines the degree of severity. (Figures 4, 5, 6, 7 and 8) The injury levels range from 6 mm of height, which is considered a mild injury, to 70 mm of height, which simulates an extremely severe lesion

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Summary

Introduction

Experimental models have been used to accumulate experiences and to improve and refine knowledge about spinal cord injury physiopathology.[1,2,3] This knowledge applied to clinical and surgical treatments is used to reduce morbidity and mortality in patients with spinal cord injury.[4]. The lesions were produced in compliance with the international protocol MASCIS (Multicenter Animal Spinal Cord Injury Study), a model that produces spinal cord contusions at different levels, which determines the degree of severity.

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