Valor diagnóstico da ressonância magnética na avaliação da dor lombar
Diagnostic significance of magnetic resonance in low back pain
Palabras clave:
Dor lombar, diagnóstico, ressonância magnética (pt)Diagnosis, magnetic resonance, low back pain (en)
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Objetivo. O objetivo deste estudo foi avaliar o valor diagnóstico da ressonância magnética-RM nas doenças da coluna lombar entre observadores com variados níveis de experiência.
Metodos. Foram selecionados 20 exames de RM que foram classificados como normais [10] ou alterados [10]. Esta classificação foi chamada de "padrão" e comparada com uma segunda realizada por 15 observadores de variados níveis de experiência, denominada "teste".
Resultados. Para identificação de alterações o índice Kappa foi 0,56 com sensibilidade de 96,7 % e especificidade de 59,3 %. Quando consideramos o acerto diagnóstico, obteve-se índice kappa de 0,19 para hérnia discal; 0,15 para doença degenerativa discal; 0,03 para discite infecciosa; e 0,24 para espondilartrose.
Conclusões. Os autores concluíram que a RM é exame de imagem com alta sensibilidade e moderada especificidade para identificação de alterações anatômicas da coluna lombar, contudo não permite que avaliadores com pouca experiência esclareçam satisfatoriamente o diagnóstico etiológico. Por este motivo, acreditamos que a solicitada rotineiramente deste exame por não-especialistas ocasiona aumento desnecessário de custos e erros diagnósticos e terapêuticos freqüentes.
Objective. This study was aimed at assessing the diagnostic value of magnetic resonance (MR) in spinal diseases amongst observers having several levels of experience.
Methods. A selection was made of 20 MR exams which were classified as being normal [10] or altered [10]; such classification was called "standard" and then compared to a second classification made by 15 observers having varying levels of experience, called "test".
Results. The Kappa index was 0,56 (96,7 % sensitivity and 59,3 % specificity) for identifying alterations. A 0,19 Kappa index was obtained for disk hernia when diagnostic correctness was considered, 0,15 for degenerative disk disease, 0,03 for infectious diskitis and 0,24 for spondylarthrosis.
Conclusions. The authors concluded that MR is an image exam having high sensitivity and moderate specificity for identifying anatomical alterations of the spinal column; however, it does not allow assessors having little experience to satisfactorily explain an aetiological diagnosis. It is thus believed that routine requests for this exam by non-specialists leads to an unnecessary increase in costs and frequent diagnostic and therapeutic errors.
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