A 52-year-old man from Delhi presents with blurred vision in both eyes for 3 days. He has a 8-year history of hypertension poorly controlled on amlodipine monotherapy. On examination, blood pressure is 178/112 mmHg. Fundoscopy reveals flame-shaped hemorrhages, cotton-wool spots, hard exudates arranged in a macular star pattern, and blurred disc margins. Serum creatinine is 2.1 mg/dL (baseline 0.9 mg/dL). What is the Keith-Wagener-Barker grade of hypertensive retinopathy in this patient?

Explanation

## Classification of Hypertensive Retinopathy The Keith-Wagener-Barker (KWB) grading system classifies hypertensive retinopathy into four grades based on fundoscopic findings and systemic manifestations. ### Grade-wise Features | Grade | Retinal Findings | Systemic Signs | Prognosis | |-------|------------------|-----------------|----------| | **1** | Arteriolar narrowing, increased A:V ratio | Minimal | Excellent | | **2** | Grade 1 + focal arteriolar constriction, AV nicking | Minimal hypertension signs | Good | | **3** | Grade 2 + flame hemorrhages, cotton-wool spots, hard exudates, papilledema | Hypertensive encephalopathy may occur | Fair | | **4** | Grade 3 + papilledema with macular star exudates | Hypertensive emergency, renal dysfunction, encephalopathy | Poor | ### Analysis of This Case **Key Point:** This patient has Grade 4 (malignant) hypertensive retinopathy because he presents with: - **Papilledema** (blurred disc margins) - **Macular star exudates** (hard exudates in a stellate pattern around the macula) - **Flame hemorrhages and cotton-wool spots** - **Acute renal dysfunction** (creatinine rise from 0.9 to 2.1 mg/dL) - **Severe hypertension** (178/112 mmHg) **High-Yield:** The presence of papilledema + macular star exudates is pathognomonic for Grade 4 hypertensive retinopathy, indicating malignant hypertension with end-organ damage. **Clinical Pearl:** Macular star exudates form due to leakage from damaged capillaries and represent lipid accumulation in Henle's layer of the retina. They arrange radially around the macula because of the radial orientation of nerve fibers in that region. **Warning:** Do not confuse Grade 3 (benign) with Grade 4 (malignant). Grade 3 may have hemorrhages and exudates but lacks papilledema. Papilledema is the hallmark of Grade 4 and indicates acute hypertensive emergency with risk of hypertensive encephalopathy and acute kidney injury.