A 52-year-old man from Delhi presents to the ophthalmology clinic with blurred vision for 2 weeks. He has a 10-year history of uncontrolled hypertension (currently BP 180/115 mmHg). On fundoscopy, you observe flame-shaped hemorrhages in the retina, cotton-wool spots, hard exudates arranged in a macular star pattern, and papilledema. The optic disc appears swollen. What is the Keith-Wagener-Barker grade of hypertensive retinopathy in this patient?

## Classification of Hypertensive Retinopathy The Keith-Wagener-Barker (KWB) classification system grades hypertensive retinopathy based on severity and fundoscopic findings. This patient's presentation includes multiple advanced features that indicate Grade IV disease. ### KWB Grading System | Grade | Findings | Prognosis | |-------|----------|----------| | I | Minimal arterial narrowing, no retinal changes | Excellent | | II | Arteriovenous nicking, flame hemorrhages, hard exudates (no papilledema) | Good | | III | Grade II findings + papilledema, cotton-wool spots, retinal edema | Fair | | IV | Grade III findings + optic disc swelling, macular star exudates, severe retinal hemorrhages | Poor | **Key Point:** Grade IV hypertensive retinopathy is also called **malignant hypertensive retinopathy** and represents a hypertensive emergency requiring immediate antihypertensive therapy. ### Features Present in This Case 1. **Papilledema** — swelling of the optic disc (hallmark of Grade III and IV) 2. **Macular star exudates** — hard exudates arranged in a star pattern around the macula (Grade IV feature) 3. **Flame-shaped hemorrhages** — present from Grade II onwards 4. **Cotton-wool spots** — present from Grade III onwards 5. **Severely elevated BP (180/115 mmHg)** — consistent with malignant hypertension **High-Yield:** The presence of **papilledema + macular star exudates** is pathognomonic for Grade IV disease. Grade III has papilledema but typically lacks the macular star pattern. **Clinical Pearl:** Grade IV hypertensive retinopathy is associated with acute kidney injury, hypertensive encephalopathy, and acute coronary syndrome. This patient requires urgent hospitalization and aggressive BP control to prevent end-organ damage. ### Why This Is Grade IV and Not Grade III While Grade III includes papilledema, the **macular star exudates** (lipid-rich hard exudates in a radial pattern around the macula) are a defining feature of Grade IV. The combination of papilledema + macular star + severe hemorrhages = Grade IV.