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[Eosinophilic lung in children]
Insights
Pulmonary eosinophilia, characterized by lung infiltrates and hypereosinophilia, is a diverse pediatric condition. Early diagnosis and treatment are crucial due to potential respiratory distress and eosinophil toxicity.
Area of Science:
- Pulmonology
- Pediatric Medicine
- Immunology
Background:
- Pulmonary eosinophilia is defined by lung infiltrates and tissue hypereosinophilia, often accompanied by blood eosinophilia.
- It presents with diverse etiologies including parasitic infections, allergic bronchopulmonary aspergillosis, vasculitis, and chronic pulmonary eosinophilia.
- This condition is rare in children and may be overlooked by pediatricians, necessitating prompt diagnosis.
Observation:
- Case reports highlight the reality of pulmonary eosinophilia in pediatrics and its varied causes.
- The severity of some cases underscores the damaging potential of eosinophil granule contents, such as major basic protein.
- Urgent diagnosis is critical for children presenting with dyspnea, hypoxia, or severe respiratory signs.
Findings:
- Etiological diversity includes filariasis, allergic bronchopulmonary aspergillosis in cystic fibrosis, Churg-Strauss syndrome, and chronic pulmonary eosinophilia.
- Pulmonary eosinophilia can manifest with significant respiratory compromise, requiring immediate medical attention.
- The major basic protein from eosinophils can damage lung epithelium and trigger basophil degranulation.
Implications:
- Recognizing pulmonary eosinophilia in children is vital for timely intervention and management.
- Understanding the pathophysiological mechanisms aids in diagnosis and treatment strategies.
- Corticosteroid therapy shows promise, potentially by inhibiting eosinophils and stabilizing cell membranes, particularly in chronic forms.
Abstract:
Pulmonary eosinophilia is an anatomo-clinical entity in which pulmonary parenchymatous infiltrates are associated with tissue hypereosinophilia. Blood eosinophilia which is very frequent but not absolutely constant makes the diagnosis likely. Four case reports illustrating pathophysiological mechanisms show its reality in pediatrics as well as its etiological diversity: parasitosis (filariasis), allergic bronchopulmonary aspergillosis complicating cystic fibrosis, vasculitis (Churg-Strauss syndrome) and chronic pulmonary eosinophilia, the last diagnosis being a diagnosis of exclusion. Pulmonary eosinophilia is rare in children and might not be recognized by pediatricians. Diagnosis might be urgent, in the case of dyspnea, hypoxia and/or threatening respiratory signs. The severity of some pulmonary eosinophilias emphasizes the toxicity of the eosinophil granulocyte content. Especially, the major basic protein is capable of destroying the pulmonary epithelium and of facilitating human basophil degranulation. The effect of corticosteroid therapy, spectacular in chronic pulmonary eosinophilia, may be related to their inhibitory effect on eosinophils and by stabilizing cellular membranes.