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Pulmonary infections diagnosed by BAL: a 12-year experience in 1066 immunocompromised patients.

Bronchoalveolar lavage (BAL) is a useful tool in the diagnosis of pulmonary infections in immunocompromised patients. We aimed to compare the spectrum of infectious pulmonary complications diagnosed using BAL in a large consecutive cohort of immunocompromised patients. The diagnostic yield of 1066 BAL specimens was analyzed in 4 different groups of immunocompromised patients (HIV; solid organ transplants; high-dose chemotherapy and/or stem cell transplants; other immunosuppressive therapy) suffering from fever, respiratory symptoms and/or infiltrates on chest X-ray. Specimens were analyzed for bacteria, mycobacteria, fungi, Pneumocystis jiroveci, cytomegalovirus (CMV) and other viruses. Two time periods were compared (1992-1996; 1997-2003). The overall diagnostic yield of BAL was 34% for bacteria, 22% for CMV, 15% for P. jiroveci, 6% for other viruses, 6% for mycobacteria and 2% for aspergillus. There were significant changes in the pattern of opportunistic infections between the 2 time periods. Mycobacterial infections decreased considerably in the HIV group (17.9 vs. 8.5%, P=0.02), while the incidence of P. jiroveci decreased mainly in the transplant group (32.6 vs. 7.9%, P<0.00001). This study demonstrates a changed pattern of pulmonary infections in immunocompromised patients diagnosed by BAL. The overall diagnostic yield of BAL remains high in immunocompromised patients with respiratory symptoms.

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