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The eosinophilic pneumonias
James N Allen1, Cynthia M Magro, Mark A King
1Department of Internal Medicine, Ohio State University, Columbus, Ohio 43210, USA. allen-4@medctr.osu.edu
Seminars in Respiratory and Critical Care Medicine
|August 10, 2005
Summary
Acute and chronic eosinophilic pneumonia share symptoms like cough and fever but differ in onset and radiographic findings. Distinguishing these conditions aids appropriate corticosteroid treatment and relapse prevention.
Area of Science:
- Pulmonology
- Internal Medicine
- Pathology
Background:
- Eosinophilic pneumonia presents as acute or chronic forms.
- Both forms share symptoms like cough, dyspnea, and fever.
- Clinical, laboratory, and radiographic distinctions are crucial for diagnosis.
Purpose of the Study:
- To differentiate between acute and chronic eosinophilic pneumonia.
- To highlight key diagnostic features for each subtype.
- To inform treatment strategies and relapse management.
Main Methods:
- Comparative analysis of clinical presentation, laboratory findings (blood and bronchoalveolar lavage eosinophils), and radiographic features.
- Review of diagnostic criteria and treatment outcomes.
- Consideration of lung biopsy for differential diagnosis.
Main Results:
- Chronic eosinophilic pneumonia (CEP) presents subacutely (weeks-months) with peripheral infiltrates on chest X-ray and high blood eosinophils.
- Acute eosinophilic pneumonia (AEP) presents acutely (within 5 days) with mixed infiltrates, Kerley B lines, and pleural effusions.
- Both show high bronchoalveolar lavage eosinophils; corticosteroids are effective, but CEP requires longer treatment to prevent relapse.
Conclusions:
- Acute and chronic eosinophilic pneumonia are distinct entities with identifiable clinical, radiographic, and laboratory differences.
- Accurate diagnosis based on these features guides appropriate corticosteroid therapy duration.
- Prompt diagnosis and adequate treatment minimize relapse risk, particularly in chronic eosinophilic pneumonia.