Management of Severe Hypertension

Classification and Diagnosis

The American College of Cardiology recommends determining whether target organ damage is present to distinguish between hypertensive emergency and urgency 1, 2
Hypertensive emergency is defined as BP >180/120 mmHg WITH evidence of acute target organ damage, which includes hypertensive encephalopathy, intracranial hemorrhage, acute MI, acute left ventricular failure with pulmonary edema, aortic dissection, acute kidney injury, thrombotic microangiopathy, or advanced retinopathy with papilledema 1, 2
Mortality without treatment for hypertensive emergency is >79% at 1 year with median survival of only 10.4 months 1

The American Heart Association recommends admitting patients with hypertensive emergency to the ICU immediately for continuous arterial BP monitoring and parenteral antihypertensive administration 1, 2
Standard BP reduction target is to reduce mean arterial pressure by 20-25% within the first hour for most emergencies 1, 2
Critical caveat is to avoid excessive BP reduction (>25% in first hour or drops >70 mmHg) which can precipitate cerebral, renal, or coronary ischemia 1, 2
After initial reduction, gradually lower BP to normal range over 24-48 hours 2

For aortic dissection, target SBP <120 mmHg AND heart rate <60 bpm immediately, and use esmolol plus nitroprusside or nitroglycerin as first-line medication 1, 2
For acute coronary syndrome or cardiogenic pulmonary edema, target SBP <140 mmHg immediately, and use nitroglycerin or nitroprusside/nitroglycerin with loop diuretic as first-line medication 1, 2
For malignant hypertension with renal failure or hypertensive encephalopathy, target 20-25% reduction in mean arterial pressure over several hours, and use labetalol IV as first-line medication 1, 2

The American College of Physicians recommends outpatient oral therapy with a BP reduction goal of no more than 25% reduction in first hour, then if stable, target <160/100-110 mmHg over next 2-6 hours 4
Recommended oral agents include captopril, labetalol, or long-acting nifedipine 4
Follow-up is recommended within 1 week to adjust therapy 3, 2

After stabilization, gradually transition to oral antihypertensives 2
Recommended regimen includes a combination of RAS blockers, calcium channel blockers, and diuretics 1
Long-term target is SBP 120-129 mmHg for most adults 1
Screen for secondary causes of hypertension, as 20-40% of patients with malignant hypertension have secondary causes 1