Hypertensive Emergency and Urgency Management

Definition and Diagnosis

The American College of Cardiology defines hypertensive emergency as severe BP elevation (>180/120 mmHg) with acute or worsening target organ damage, whereas hypertensive urgency is severe BP elevation (>180/120 mmHg) without acute target organ damage in otherwise stable patients 1, 2
The actual BP level matters less than the rate of rise—patients with chronic hypertension tolerate higher pressures than previously normotensive individuals 1

Systematically evaluate for acute complications such as cardiac (acute cardiogenic pulmonary edema, acute myocardial infarction or unstable angina, acute heart failure), neurological (hypertensive encephalopathy, acute ischemic or hemorrhagic stroke, intracranial hemorrhage), renal (acute renal failure, thrombotic microangiopathy), vascular (aortic dissection or aneurysm), ophthalmologic (advanced hypertensive retinopathy), and obstetric (eclampsia or severe preeclampsia) to distinguish emergency from urgency 1, 2

The American College of Cardiology recommends immediate ICU admission for continuous BP monitoring and parenteral therapy 1, 2
Reduce SBP by no more than 25% within the first hour, then to 160/100 mmHg within the next 2-6 hours, and then cautiously to normal during the following 24-48 hours 1, 2
For patients with compelling conditions such as aortic dissection, severe preeclampsia/eclampsia, or pheochromocytoma crisis, reduce SBP to specific targets immediately 1, 2
Intravenous medication selection depends on the clinical context, such as acute coronary syndrome, acute cardiogenic pulmonary edema, aortic dissection, hypertensive encephalopathy, acute ischemic stroke, or eclampsia/severe preeclampsia 1, 2
Preferred IV agents include nicardipine, clevidipine, and sodium nitroprusside, with specific dosing and contraindications 1

The American College of Cardiology recommends outpatient management with reinstitution or intensification of oral antihypertensive therapy, treatment of anxiety if applicable, and reduction of BP to baseline or normal over 24-48 hours 1, 2
Ensure continuing outpatient follow-up and avoid excessive BP reduction, which can cause organ hypoperfusion 1, 2

Avoid using immediate-release nifedipine, which causes unpredictable BP drops 2
Do not use oral therapy for hypertensive emergencies, as IV medications are required 1
Avoid misclassifying urgency as emergency, and avoid sodium nitroprusside for prolonged periods without thiosulfate coadministration to prevent cyanide toxicity 1, 2
Do not delay transition to oral therapy once the patient is stabilized 2
The untreated 1-year mortality rate for hypertensive emergencies exceeds 79%, making prompt recognition and appropriate treatment essential 1