Hypertensive Emergency Management
Diagnosis and Assessment
- Hypertensive emergency is defined as BP >180/120 mmHg WITH acute target organ damage, though the rate of BP rise may be more important than the absolute value in patients with previously normal BP 1.
- The presence of headache with vomiting in the context of elevated BP suggests hypertensive encephalopathy, which can progress to altered mental status, seizures, and coma if untreated 1.
Immediate Management
- Admit immediately to ICU for continuous arterial line BP monitoring (Class I recommendation, Level B-NR) 1, 2.
- Reduce mean arterial pressure by 20-25% within the first hour 1, 2.
- Target BP: 160/100 mmHg over the next 2-6 hours if stable 1, 2.
- Nicardipine IV is the preferred first-line agent for hypertensive encephalopathy because it preserves cerebral blood flow and does not increase intracranial pressure 1.
Diagnostic Workup
- Complete blood count, basic metabolic panel, lactate dehydrogenase, haptoglobin, urinalysis, and troponins should be obtained immediately to assess for target organ damage 1.
- Brain CT or MRI with FLAIR imaging should be performed to evaluate for hypertensive encephalopathy, posterior reversible encephalopathy syndrome (PRES), intracranial hemorrhage, or ischemic stroke 1.
Post-Stabilization Management
- Begin oral antihypertensive regimen 24-48 hours after stabilization 1.
- Target BP <130/80 mmHg for most patients 1, 2.
- Screen for secondary causes of hypertension, including renal artery stenosis, pheochromocytoma, primary aldosteronism, or renal parenchymal disease, as 20-40% of patients with malignant hypertension have secondary causes 1, 2.