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Pulmonary infiltrates in immunosuppressed patients: analysis of a diagnostic protocol
Cristina Danés1, Julián González-Martín, Tomàs Pumarola
1Servei de Microbiologia, Institut Clínic d'Infeccions i Immunologia, Institut d'Investigacions Biomèdiques Agustí Pi i Sunyer, Hospital Clínic de Barcelona, Barcelona, Spain.
Insights
Diagnosing pulmonary infiltrates in immunosuppressed patients is crucial. Bronchoaspirate and bronchoalveolar lavage offer high diagnostic yields, with sample quality significantly impacting results.
Area of Science:
- Pulmonary Medicine
- Infectious Diseases
- Diagnostic Microbiology
Background:
- Pulmonary infiltrates are common in immunosuppressed patients.
- Accurate diagnosis is essential for effective treatment.
Purpose of the Study:
- To analyze the diagnostic yields of various techniques for pulmonary infiltrates in immunosuppressed patients.
- To evaluate the impact of sample quality and rapid diagnostic tests.
Main Methods:
- Prospective study of 241 immunosuppressed patients with new pulmonary infiltrates.
- Noninvasive and invasive diagnostic evaluations were performed.
- Analysis of diagnostic yields from bronchoaspirate, bronchoalveolar lavage, and rapid tests.
Main Results:
- Diagnosis was achieved in 84% of patients; 72% had pneumonia.
- Bronchoaspirate and bronchoalveolar lavage showed the highest diagnostic yields.
- Optimal sample quality correlated with better results, especially in sputum bacterial culture.
- Rapid diagnostic tests contributed to 62.2% of etiological pneumonia diagnoses.
Conclusions:
- Bronchoaspirate and bronchoalveolar lavage are key diagnostic tools for pulmonary infiltrates in immunosuppressed patients.
- Sample quality is critical for maximizing diagnostic yield.
- Rapid diagnostic tests play a valuable role in the diagnostic strategy.
Abstract:
A diagnostic protocol was started to study the etiology of pulmonary infiltrates in immunosuppressed patients. The diagnostic yields of the different techniques were analyzed, with special emphasis on the importance of the sample quality and the role of rapid techniques in the diagnostic strategy. In total, 241 patients with newly developed pulmonary infiltrates within a period of 19 months were included. Noninvasive or invasive evaluation was performed according to the characteristics of the infiltrates. Diagnosis was achieved in 202 patients (84%); 173 patients (72%) had pneumonia, and specific etiologic agents were found in 114 (66%). Bronchoaspirate and bronchoalveolar lavage showed the highest yields, either on global analysis (23 of 35 specimens [66%] and 70 of 134 specimens [52%], respectively) or on analysis of each type of pneumonia. A tendency toward better results with optimal-quality samples was observed, and a statistically significant difference was found in sputum bacterial culture. Rapid diagnostic tests yielded results in 71 of 114 (62.2%) diagnoses of etiological pneumonia.
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