[Bronchoscopic diagnosis of lung infiltrates in immunocompromised patients].

Bronchoscopy with bronchoalveolar lavage was undertaken in 21 immunocompromised patients for microbiological and cytological diagnosis. In all of these patients radiologically confirmed pneumonic lesions had developed which, under empirical antibiotic treatment, had progressed or not clearly regressed. In four patients each the causative organisms of the pneumonia were identified as Pneumocystis carinii and Legionella, respectively, and Aspergilla in a further three. Proof of the causative organism in these patients resulted in a change of the antibiotic treatment. The pneumonia was healed in 11 patients. Ten patients died. Early bronchoscopy to identify the causative organism is recommended in immunocompromised patients so that, by administering microorganism-specific treatment, the at present high mortality in this group may be reduced.