## Keith-Wagener Classification of Hypertensive Retinopathy **Key Point:** The Keith-Wagener-Barker classification stratifies hypertensive retinopathy into four grades based on severity and prognosis. ### Grade-wise Features | Grade | Retinal Findings | Prognosis | |-------|------------------|----------| | **Grade 1** | Arteriolar narrowing, increased A:V ratio (normal 2:3, becomes 1:2) | Excellent | | **Grade 2** | Grade 1 + arteriovenous nicking, flame hemorrhages, cotton-wool spots | Good | | **Grade 3** | Grade 2 + hard exudates, macular star, retinal edema | Fair | | **Grade 4** | Grade 3 + papilledema, optic disc swelling, retinal whitening (Elschnig spots, Siegrist streaks) | Poor | **High-Yield:** Grade 3 is the critical threshold — it marks the transition from chronic to acute/accelerated hypertension. The appearance of hard exudates and macular star (lipid deposition in a radial pattern around the macula) distinguishes Grade 3 from Grade 2. **Clinical Pearl:** The macular star in Grade 3 hypertensive retinopathy results from lipid exudation along Henle's fiber layer radiating from the fovea — a highly characteristic finding that indicates significant retinal edema and microvascular leakage. **Mnemonic:** **AHEM** for Grade progression: - **A**rteriolar narrowing (Grade 1) - **H**emorrhages & cotton-wool (Grade 2) - **E**xudates & macular star (Grade 3) - **M**alignant/papilledema (Grade 4) 
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