[Pulmonary complications in patients with rheumatoid arthritis].
Pulmonary manifestations of rheumatoid arthritis were studied in 26 patients. Pulmonary complications could be divided into four subgroups: Interstitial pneumonia/Pulmonary fibrosis (n = 18), Bronchiolitis Obliterans Organizing Pneumonia (n = 4), Bronchiolitis Obliterans (n = 2), and Pleuritis/Pericarditis (n = 1). Analysis of cells in broncho-alveolar lavage fluid (BALF) revealed abnormally high percentages of lymphocytes in one-half of the patients and abnormally high percentages of neutrophils in one-third of the patients. The percent of BALF cells that were neutrophils was higher with higher chest radiograph grades. Analysis of soluble constituents of BALF indicated local production of IgG in two cases, but IgM-rheumatic factor was not detected. In 18 of 26 patients corticosteroid or immunosuppressive drugs were needed, and most of the patients responded to the therapy and had good outcomes. The conditions of 6 patients with interstitial pneumonia/pulmonary fibrosis deteriorated and 4 patients died of progressive respiratory failure. The subclassification of rheumatoid lung was useful for predicting its outcome.