Objective: To verify how efficient respiratory parameters are in the follow-up of subjects with amyotrophic lateral sclerosis (ALS) and to observe possible correlations between respiratory and nutritional functions. Method: Sixteen patients with probable or defined ALS were selected and evaluated over eight months using the following respiratory parameters: spirometry, maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP), arterial gasometry and pulse oximetry; and nutritional parameters such as body mass index (BMI) and percentage weight loss. Results: P a CO 2 was a significant parameter to follow up disease evolution (p=0.051). There was significant correlation between MIP and MEP (r: 0.83); BMI and MIP (r: 0.70); BMI and MEP (r: 0.72); pulse oximetry and forced vital capacity (r: 0.57). Conclusion: P a CO 2 was shown to be an efficient and significant parameter in the measurement of respiratory impairment; the correlations among MIP, MEP and BMI indicated that these are significant parameters for periodic clinical evaluation. Key words: amyotrophic lateral sclerosis, maximum inspiratory pressure, maximum expiratory pressure, body mass index.Esclerose lateral amiotrófica: estudo prospectivo de parâmetros respiratórios RESUMO Objetivo: Verificar a eficácia dos parâmetros respiratórios na evolução de indivíduos com esclerose lateral amiotrófica (ELA) e identificar possíveis correlações entre função respiratória e nutricional. Método: 16 pacientes com diagnóstico provável ou definido de ELA foram selecionados por critérios definidos e avaliados, durante 8 meses, através de parâmetros respiratórios: espirometria, pressão inspiratória máxima (PIM), pressão expiratória máxima (PEM), gasometria arterial e oximetria de pulso; e parâmetros nutricionais: índice de massa corporal (IMC) e porcentagem de perda de peso. Resultados: P a CO 2 foi um parâmetro significativo para acompanhar a evolução da doença (p=0.051). Houve correlação significante entre PIM e PEM (r: 0.83); IMC e PIM (r: 0.70); IMC e PEM (r: 0.72); oximetria de pulso e capacidade vital forçada (r: 0.57). Conclusão: P a CO 2 foi marcador eficaz e significante para medir o comprometimento respiratório; correlações entre PIM, PEM e IMC indicaram ser bons parâmetros nas avaliações clínicas periódicas. Palavras-chave: esclerose lateral amiotrófica, pressão inspiratória máxima, pressão expiratória máxima, índice de massa corporal.
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