Key Concepts
Introduction
Eosinophilic pneumonia is characterized by massive eosinophil accumulation in the alveoli and interstitium driven by IL-5 and eotaxin-mediated chemotaxis. Eosinophils release cytotoxic granule proteins (major basic protein, eosinophil peroxidase) that directly damage alveolar epithelial cells and basement membranes. Acute eosinophilic pneumonia (AEP) presents with rapid-onset respiratory failure, often in new smokers or after environmental exposure. Chronic eosinophilic pneumonia (CEP) follows a more indolent course with characteristic peripheral pulmonary infiltrates (photographic negative of pulmonary edema). On the exam, writers often pair stable-sounding options with unstable dataโnotice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent harm and matches orders for the role you were given. Train yourself to state the primary risk in one short phrase before you read the options so distractors do not rewrite...