[Clinical features of subacute interstitial pneumonia--clinico-pathological study based on open lung biopsy findings].

A clinico-pathological study was done to elucidate characteristic features of subacute interstitial pneumonia. The patients were four men and mine women, with a mean age of 60 years. In ten patients, the disease was idiopathic, three had collagen vascular disease, (and one was undergoing gold therapy for rheumatoid arthritis). The time interval between onset of symptoms and open lung biopsy was 80 +/- 40 days. Eleven patients had progressive dyspnea, seven had coughing, and only one complained of fever. Fine crakles were heard in ten patients. Mild increases in CRP were observed in all cases. Mild increases in total serum IgG concentration were observed in five of eight cases. Multiple patchy infiltration or diffuse interstitial shadows, located predominantly in the lower fields of both lungs were the characteristic chest roentgenographic findings. The average %VC was 62.7 +/- 17% and the average PaO2 was 68.3 +/- 10 Torr. Bronchoalveolar lavage was done in nine patients, and the mean total cell count was 16.5 +/- 10.2 x 10(4)/ml. A moderate increase in lymphocytes (30.8 +/- 18.6%) with a low CD4/8 ratio (0.48 +/- 0.57), a mild increase in neutrophils (6.2 +/- 9.1%), and a mild increase in eosinophils (2.3 +/- 3.7%) were observed. Pathologically, interstitial cellulo-fibrous changes associated with alveolar space closure due to organization of exudate were the main features. Patients were given steroid pulse therapy or oral steroids. The results were mild to marked improvements in chest roentgenographic findings and lung function.(ABSTRACT TRUNCATED AT 250 WORDS)