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[Invasive pulmonary aspergillosis]
C H Marquette1, B Wallaert, P Ramon
1Service de Pneumologie et Immuno-allergologie, Hôpital A. Calmette, Lille.
Abstract:
Invasive pulmonary aspergillosis is an opportunistic pneumonia which is particularly common in immuno-depressed subjects. The most frequent risk factors are the intensity and duration of leucopaenia, cytotoxic drugs and steroid therapy. In the respiratory tract, the proliferation of Aspergillus fumigatus becomes possible when there is a failure of the reticulo-endothelial system and of the polymorphonuclear leucocytes. There is no typical clinical picture: one sees an acute febrile pneumonia resistant to antibiotics. However, the radiological signs are more suggestive with nodules and bilateral infiltrates with a tendency to cavity formation and sequestration. The prognosis is clinically linked to the rapidity of diagnosis. Broncho-alveolar lavage offers a new and non-invasive diagnostic method to search for Aspergillus mycelia or specific antigens. A direct examination and culture of sputum expectoration are both insensitive and non-specific but remain useful in some patients with leukaemia in a phase of agranulocytosis. Treatment rests on Amphotericin B taken orally.
Insights
Invasive pulmonary aspergillosis, a fungal pneumonia, often affects immunocompromised patients. Early diagnosis via broncho-alveolar lavage improves prognosis for this antibiotic-resistant infection.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Pulmonology
Context:
- Invasive pulmonary aspergillosis (IPA) is a severe opportunistic infection.
- Common in immunocompromised individuals, particularly those with prolonged leucopaenia, cytotoxic drugs, or steroid therapy.
- Aspergillus fumigatus proliferation occurs due to impaired immune defenses.
Purpose:
- To describe the clinical presentation, diagnosis, and treatment of IPA.
- To highlight the diagnostic utility of broncho-alveolar lavage (BAL).
- To emphasize the link between diagnostic speed and patient prognosis.
Summary:
- IPA presents as acute febrile pneumonia, often resistant to antibiotics.
- Radiological findings include nodules, bilateral infiltrates, and cavitation.
- Broncho-alveolar lavage is a valuable non-invasive diagnostic tool for detecting Aspergillus.
- Sputum analysis has limited sensitivity and specificity.
Impact:
- Early diagnosis, especially with BAL, is crucial for improving patient outcomes in IPA.
- Highlights the limitations of traditional diagnostic methods like sputum examination.
- Informs clinical practice regarding the management of opportunistic fungal pneumonias.