Revista Portuguesa de Pneumologia (Oct 2009)
Correlações entre variáveis respiratórias e funcionais na insuficiência cardíaca Correlations between respiratory and functional variables in heart failure
Abstract
Fundamento:Alterações respiratórias podem influenciar o desempenho funcional em doentes com insuficiência cardíaca (IC). Objectivo: Correlacionar a força muscular inspiratória máxima (PImax) e as variáveis da função pulmonar com a capacidade funcional em doentes com IC. Métodos: Estudo transversal realizado de Janeiro a Julho de 2007 incluindo 42 doentes com IC crónica (28 homens) que não apresentavam doença pulmonar prévia. Os doentes pertenciam às classes funcionais I, II e III segundo a NYHA (New York Heart Association). As variáveis respiratórias mensuradas foram a PImax, a CVF (capacidade vital forçada) e o VEF1(volume expiratório forçado no 1.º segundo). A distância percorrida no teste da caminhada dos seis minutos (TC6M), a classe funcional (CF) e o domínio referente à capacidade funcional do questionário de qualidade de vida Short Form -36 (SF -36) foram as variáveis funcionais utilizadas. Resultados: A PImax correlacionou-se com a TC6M (r=0,543 e pBackground: Respiratory alterations can impact on the functional performance of patients with heart failure. Aim: To correlate maximum inspiratory muscular force and lung function variables with functional capacity in heart failure patients. Methods: A transversal study January-July 2007 with 42 chronic heart disease patients (28 males) with no prior pulmonary illness. The patients were in New York Heart Association Functional Class I, II and III. The variables used were maximum inspiratory pressure, forced vital capacity and forced expiratory volume in the first second. Respiratory variables measured were distance covered in the six-minute walk test, NYHA functional class and the physical functioning domain of the Short Form-36 Quality of Life Questionnaire. Results: Maximum inspiratory pressure correlated with the six-minute walk test (r=0.543 and p<0.001), functional capacity (r=-0.566 and p<0.001) and the physical functioning domain score of the Short Form-36 (r=0.459 and p=0.002). The same was true of forced vital capacity and the six-minute walk test (r=0.501 and p=0.001), functional capacity (r=-0.477 and p=0.001) and Short Form-36 (r=0.314 and p=0.043) variables. Forced expiratory volume correlated with the distance covered in the six-minute walk test (r=0.514 and p<0.001) and functional capacity (r=-0.383 and p=0.012). Conclusion: Lung function and inspiratory muscular force respiratory variables correlated with functional variables in patients with heart failure.
