A 52-year-old man with a 10-year history of hypertension presents to the emergency department with a blood pressure of 240/140 mmHg, severe headache, and blurred vision. Fundoscopy reveals flame-shaped hemorrhages and cotton-wool spots. Serum creatinine is 2.8 mg/dL (baseline 1.0 mg/dL). What is the most appropriate immediate next step in management?

Question

Accepted Answer

B. Administer intravenous labetalol or nicardipine and admit to ICU for continuous monitoring. ## Clinical Diagnosis: Hypertensive Emergency with End-Organ Damage

This patient presents with **hypertensive emergency** — defined as severely elevated blood pressure (typically >180/120 mmHg) WITH acute end-organ damage.

### Evidence of End-Organ Damage

| Organ System | Finding | Significance |
|---|---|---|
| **Retina** | Flame hemorrhages, cotton-wool spots | Acute hypertensive retinopathy |
| **Kidney** | Acute rise in creatinine (1.0 → 2.8 mg/dL) | Acute kidney injury from malignant hypertension |
| **CNS** | Severe headache, blurred vision | Risk of hypertensive encephalopathy |

### Management Algorithm for Hypertensive Emergency

```mermaid
flowchart TD
  A["BP >180/120 + end-organ damage"]:::outcome --> B{"Hypertensive Emergency?"}:::decision
  B -->|Yes| C["Admit ICU for continuous monitoring"]:::action
  C --> D["IV titratable agent: labetalol or nicardipine"]:::action
  D --> E["Target: reduce MAP by 10-20% in first hour"]:::action
  E --> F["Then 5-10% reduction over next 2-6 hours"]:::action
  F --> G["Avoid abrupt drops: risk of stroke/MI"]:::urgent
  B -->|No| H["Hypertensive Urgency"]:::outcome
  H --> I["Oral agents, outpatient follow-up"]:::action
```

**Key Point:** Hypertensive emergency requires **IV titratable agents** (labetalol or nicardipine) with **ICU-level continuous monitoring**. The goal is controlled, gradual reduction of BP, NOT immediate normalization.

**High-Yield:** The classic mnemonic for end-organ damage in malignant hypertension is **CHASED**:
- **C**erebral (encephalopathy, stroke)
- **H**eart (acute MI, pulmonary edema)
- **A**rterial (aortic dissection)
- **S**erum creatinine (acute kidney injury)
- **E**ye (retinopathy with hemorrhages/exudates)
- **D**issection (aortic)

**Clinical Pearl:** Labetalol (combined α and β blockade) and nicardipine (calcium channel blocker) are preferred because they allow **titratable, gradual BP reduction** and can be easily reversed if hypotension develops. Avoid immediate aggressive reduction — risk of stroke, MI, or acute coronary syndrome due to loss of cerebral autoregulation.

**Warning:** Do NOT use immediate-release nifedipine (sublingual) — unpredictable absorption and risk of sudden, uncontrolled BP drop.

[cite:Harrison 21e Ch 298]

Answer

A. Perform immediate hemodialysis for acute kidney injury

Answer

C. Administer intravenous hydralazine 20 mg as a single bolus and observe for 2 hours

Answer

D. Start oral amlodipine 10 mg and arrange outpatient follow-up in 1 week

Explanation

Clinical Diagnosis: Hypertensive Emergency with End-Organ Damage

Evidence of End-Organ Damage

Management Algorithm for Hypertensive Emergency

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Organ System	Finding	Significance
Retina	Flame hemorrhages, cotton-wool spots	Acute hypertensive retinopathy
Kidney	Acute rise in creatinine (1.0 → 2.8 mg/dL)	Acute kidney injury from malignant hypertension
CNS	Severe headache, blurred vision	Risk of hypertensive encephalopathy