Hypertensive emergency: workup and management
Severe hypertension (usually >180/120 mmHg) with acute target-organ damage is a hypertensive emergency needing IV therapy and controlled lowering in a monitored setting. Severe hypertension without organ damage is managed with oral agents and outpatient follow-up; rapid lowering is harmful.
Working diagnosis
Adult · US guidelines
Draft · awaiting physician review
01Orient
What's new in the evidence
- 2025 AHA/ACC multisociety BP guideline: hypertensive emergency (>180/120 mmHg with acute target-organ damage) is managed in the ICU
- Compelling conditions (aortic dissection, severe preeclampsia/eclampsia, pheochromocytoma crisis): SBP <140 mmHg within the first hour, <120 mmHg in aortic dissection
- Without a compelling condition: lower by ≤25% in the first hour, to <160/100 over 2–6 hours, then to 130–140 systolic over 24–48 hours
- New Class 3 (Harm): do not give PRN IV or oral antihypertensives for asymptomatic severe hypertension in patients admitted for other conditions
- 2024 AHA scientific statement: treat causes of inpatient BP spikes (pain, withdrawal, missed home medications) and restart the home regimen
Differential diagnoses
- Hypertensive emergency with encephalopathy, stroke, ACS, acute heart failure, AKI or retinopathy
- Aortic dissection (can't miss)
- Preeclampsia or eclampsia (can't miss)
- Stimulant use (cocaine, amphetamines), withdrawal from clonidine or beta-blockers
- Severe hypertension without organ damage ("urgency") due to nonadherence, pain or anxiety
- Pheochromocytoma, renovascular disease
02Assess
Risk scores and decision tools
- Target-organ damage checklist: brain, heart, aorta, kidney, retina, placenta
- Aortic Dissection Detection Risk Score if chest or back pain
- Fundoscopy grading for retinopathy
Key history questions
- Headache, confusion, visual change, seizures
- Chest or back pain, dyspnea
- Antihypertensive adherence; recent stopping of clonidine or beta-blockers
- Stimulants, MAOIs, decongestants, NSAIDs
- Pregnancy or recent delivery
Examination findings
- BP in both arms with the right cuff size; repeat after rest
- Fundoscopy: hemorrhages, exudates, papilledema
- Neurological exam
- Heart failure signs, pulse deficits (dissection)
03Investigate
Initial investigations
- BMP, creatinine, urinalysis (protein, blood)
- ECG, troponin
- CBC with smear (thrombotic microangiopathy), LDH
- Pregnancy test
Advanced investigations
- CT head if neurological signs
- CT angiography if dissection suspected
- Chest X-ray, echocardiogram as indicated
04Treat
Immediate management
- Hypertensive emergency: ICU or step-down, arterial line when possible
- No compelling condition: lower BP by no more than 25% in the first hour, then to <160/100 over 2–6 hours, then toward 130–140 systolic over 24–48 hours
- Nicardipine infusion 5 mg/h, titrated by 2.5 mg/h every 5–15 min (max 15 mg/h), or clevidipine; nicardipine reaches target more often than labetalol
- Labetalol IV boluses or infusion if no contraindication
First-line treatment
- Aortic dissection: HR <60 and SBP <120 within 20 minutes (esmolol first, then a vasodilator)
- Severe preeclampsia/eclampsia: IV labetalol or hydralazine, or oral nifedipine, plus magnesium; SBP <140 within the first hour
- Acute ischemic stroke: follow stroke-specific BP targets
- Asymptomatic severe inpatient hypertension: no PRN IV antihypertensives; treat pain or withdrawal, resume home medications, titrate oral agents
Second-line treatment
- Sympathomimetic (cocaine): benzodiazepines first; avoid beta-blockers alone
- Pulmonary edema: nitroglycerin plus diuretic if volume overloaded
Specialist referrals
- ICU for hypertensive emergency
- Cardiothoracic surgery for type A dissection
- Obstetrics for preeclampsia
05Disposition
Admission criteria
- Any acute target-organ damage
Safe discharge criteria
- No target-organ damage on evaluation
- Oral regimen restarted or started; follow-up within 1 week
Follow-up timing
- Primary care within 1 week
Patient instructions
- Take medications daily; home BP monitoring
- Return for headache, chest pain, weakness or vision change
Monitoring
- BP every 5–15 minutes while titrating IV therapy
- Renal function and neuro checks
Clinical pearls and pitfalls
- Rapid normalization can cause stroke, MI or AKI because autoregulation has shifted
- Avoid sublingual nifedipine and IV hydralazine as first choices outside pregnancy (unpredictable drops)
- Search for secondary causes in young patients or resistant hypertension
RefGuidelines and landmark evidence
- GuidelineACC/AHA – Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults (2017)PubMed
- GuidelineAHA/ACC – Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults (2025)PubMed
- GuidelineAHA – Management of Elevated Blood Pressure in the Acute Care Setting: Scientific Statement (2024)PubMed
For education only. Typical adult starting points; confirm doses against renal function, allergies, interactions and your institution's protocols. Not a substitute for clinical judgment or senior review.