Acute vs Chronic Inflammation Cellular Hallmarks
Distinguishing acute from chronic inflammation by cellular markers is fundamental to pathology and appears across USMLE Step 1, shelf exams, and histology practicals. Mastering which cell types define each phase — and why — builds the foundation for interpreting tissue injury patterns throughout medicine.
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5 CardsKey chemical mediators of acute inflammation
Chronic inflammation tissue changes
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What is the difference between acute and chronic inflammation histologically?
Acute inflammation shows neutrophil-rich infiltrate, edema, and vascular changes. Chronic inflammation shows lymphocytes, plasma cells, macrophages, fibrosis, and new vessel formation.
- Acute: neutrophils + edema
- Chronic: mononuclear cells + fibrosis
Can chronic inflammation occur without preceding acute inflammation?
Yes. Some conditions — like tuberculosis, autoimmune disease, and viral infections — trigger chronic inflammation from the start, bypassing the classic acute phase. This is called primary chronic inflammation.
Why do neutrophils dominate in acute inflammation?
Neutrophils are short-lived but rapidly recruited via CXCL8 (IL-8) and complement fragments (C5a). They are optimized for fast microbial killing via phagocytosis and the oxidative burst, then die within 1–2 days.