Management of Hypertensive Emergency

Diagnosis and Classification

A patient with severely elevated blood pressure (>180/120 mmHg) and symptoms of headache and visual disturbances (blurred vision) indicates a hypertensive emergency with evidence of acute hypertension-mediated organ damage (HMOD) 1, 2
The combination of severely elevated blood pressure and neurological symptoms suggests hypertensive encephalopathy, which is defined as severe BP elevation associated with neurological symptoms in the absence of other explanations 2, 3
Fundoscopic examination is essential to look for advanced bilateral retinopathy (hemorrhages, cotton wool spots, papilledema) which would indicate malignant hypertension 1, 2

Perform thorough cardiovascular and neurologic assessment to evaluate the extent of organ damage 2, 3
Laboratory tests should include: hemoglobin, platelets, creatinine, sodium, potassium, lactate dehydrogenase, haptoglobin, and urinalysis for protein 1, 3
Additional examinations should include fundoscopy and ECG 1, 2
Consider brain imaging (CT/MRI) to rule out other causes of neurological symptoms such as stroke 2, 3

Immediate BP reduction is required for hypertensive encephalopathy, with a target reduction in mean arterial pressure (MAP) by 20-25% immediately 1, 2, 4
Avoid excessive falls in pressure (>25% reduction) within the first hour as this may precipitate renal, cerebral, or coronary ischemia 5, 6
The patient should be admitted to an Intensive Care Unit for continuous BP monitoring and parenteral antihypertensive administration 5, 7

Labetalol is the first-line treatment for hypertensive encephalopathy, with an initial IV bolus of 20-80 mg every 10 minutes, onset of action: 5-10 minutes, and duration of action: 3-6 hours 4, 7
Labetalol leaves cerebral blood flow relatively intact and does not increase intracranial pressure 4

Nicardipine is an effective alternative, with a dosage of 5-15 mg/hour IV infusion, onset of action: 5-10 minutes 4, 5
Sodium nitroprusside can also be used but with caution, with a dosage of 0.25-10 μg/kg/min as IV infusion, immediate onset of action, and short duration (1-2 minutes) 4, 7

After initial reduction, if BP is stable, gradually reduce to 160/100-110 mmHg within the next 2-6 hours 5, 6
Further gradual reductions toward normal BP can be implemented over the next 24-48 hours if the patient remains clinically stable 5, 6
Screen for secondary causes of hypertension, which can be found in 20-40% of patients presenting with malignant hypertension 1, 2

Short-acting nifedipine is no longer considered acceptable for initial treatment of hypertensive emergencies due to risk of precipitous BP drops 5, 6
Avoid excessive acute drops in systolic BP (>70 mmHg) as they may be associated with acute renal injury and neurological deterioration 8

Patients with hypertensive emergencies remain at high risk and should be screened for secondary hypertension 8