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Hypertensive emergency

Updated Oct 22, 2026Adults · ED management17 sources · 9 checked in PubMed1 figureAHA/ACC 2025 · ACEP 2025

Bottom line

  • Organ damage defines the emergency, not the number. A hypertensive emergency is BP above 180 and/or 120 mm Hg with evidence of acute target organ damage. Admit these patients to an ICU.1,2
  • Lower BP in stages. Without a compelling condition, cut SBP by no more than 25% in the first hour, then to under 160/100 over the next 2–6 hours, then cautiously to 130–140 over 24–48 hours.1,2
  • Compelling conditions go faster. In aortic dissection, get SBP under 120 within the first hour. For most other compelling conditions, aim for under 140 in that hour.1,2
  • Severe hypertension without organ damage is not an emergency. It is treated as an outpatient with oral medication. Acute IV or extra oral doses to drop the number are not recommended.1,2
  • Starting an oral drug at ED discharge is reasonable. ACEP says to consider it for asymptomatic elevated BP and to arrange follow-up (Level C).3,4

Definitions

TermDefinitionWhere to treat
Hypertensive emergencyBP > 180 and/or > 120 mm Hg with acute target organ damageICU, continuous BP monitoring, consider IV therapy1,2
Severe hypertensionBP > 180/120 mm Hg, no acute target organ damageOutpatient: start, restart or intensify oral medication promptly1,2
Asymptomatic elevated BP (ACEP)Raised BP found in the ED without symptoms of organ injuryConsider an oral drug at discharge; refer for follow-up3,4

The 2025 guideline handles stroke, intracerebral hemorrhage and pregnancy in their own sections, with different targets (below).1,2 Patients without acute organ damage do not have a hypertensive emergency, and usually can be treated orally and discharged after a short observation.5 The 2024 AHA statement on BP in acute care favors objective terms over labels such as "crisis" and "urgency", which were linked to unnecessary treatment.6

Look for organ damage

The key target organs are the heart, retina, brain, kidneys and large arteries. The type of organ damage decides the drug, the BP target and how fast to get there.5

Organ damage in ED hypertensive emergenciesPooled prevalence
Ischemic stroke28.1%
Pulmonary edema or acute heart failure24.1%
Hemorrhagic stroke14.6%
Acute coronary syndrome10.8%
Renal failure8.0%
Subarachnoid hemorrhage6.9%
Encephalopathy6.1%
Aortic dissection1.8%

Meta-analysis of 15 ED studies (n = 4,370). In-hospital mortality was 9.9%.7

  • It is rare. Hypertensive emergencies were about 0.5% of all ED patients, and about 36% of those presenting with a hypertensive crisis.7 In US national data, they were about 2 per 1,000 adult ED visits in 2013, though the number had more than doubled since 2006.8
  • Symptoms point to the organ. In one Italian ED, emergencies most often presented with chest pain (27%), dyspnea (22%) and a neurological deficit (21%). Patients with high BP but no organ damage most often had headache (22%) or epistaxis (17%).9

First steps

  1. Confirm the BP and look for acute organ damage in the brain, heart, retina, kidneys and aorta.1,5
  2. No organ damage: this is severe hypertension, not an emergency. Don't push IV or extra oral doses to drop the number. Start or adjust oral therapy and arrange follow-up.1,2,3
  3. Organ damage present: admit to an ICU for continuous BP monitoring and consider a titratable IV drug.1,2
  4. Check for a compelling condition (such as aortic dissection). It sets a lower, faster target.1,2
  5. Stroke, intracerebral hemorrhage or pregnancy? Use their specific targets instead (below).1,2

BP targets

SituationTargetClass, level
Nonpregnant, no stroke
Aortic dissectionSBP < 120 mm Hg within the first hour1, C-LD
Other compelling conditionSBP < 140 mm Hg within the first hour1, C-LD
No compelling conditionSBP down no more than 25% in hour 1; then < 160/100 over the next 2–6 h; then 130–140 over 24–48 h1, C-LD
Severe HTN, no organ damage, hospitalizedNo intermittent IV or extra oral doses to lower BP acutely3: Harm, B-NR
Acute ischemic stroke
Before IV thrombolysis< 185/110, then < 180/105 for at least 24 h1, B-NR
Endovascular treatment≤ 180/105 during and for 24 h after2a, B-NR
No reperfusion, BP ≥ 220/120Lowering by 15% in the first 24 h might be reasonable2b, C-LD
Spontaneous intracerebral hemorrhage
SBP 150–220Lower SBP promptly to 130 to < 140 for at least 7 days; stop drugs if SBP < 1302a, A
SBP > 220Don't drop SBP below 1303: Harm, B-NR
Pregnancy
SBP ≥ 160 or DBP ≥ 110, confirmed within 15 minTreat to < 160/110 within 30–60 min1, B-R

All targets and classes are from the 2025 AHA/ACC guideline, as given in its published summary.1,2 In pregnancy, the guideline lists nitroprusside, ACE inhibitors, ARBs and atenolol among drugs to avoid because of fetal harm.1,2

FIG 1Staged BP lowering. Target windows from the start of treatment, drawn for this page from the 2025 AHA/ACC recommendations. Compelling conditions and pregnancy need their targets within the first hour; the no-compelling-condition pathway steps down over 2 days. The lighter bars are "over the next" windows.1,2
Sources differ

The 2025 guideline frames the first-hour limit as SBP falling by no more than 25%.1,2 The 2024 AHA scientific statement on BP in acute care, as summarized in a 2025 review of guidelines, aims for a 20–25% fall in mean arterial pressure in the first hour.6 Either way, the point is a controlled, partial drop, not normalization.

IV drugs

The choice of drug varies little between types of hypertensive emergency. What changes is how far and how fast you lower BP.10 IV options listed in the 2024 AHA statement include labetalol, nicardipine, clevidipine, esmolol, nitroglycerin and nitroprusside.6

DrugAdult doseTitrationDo not use in
Nicardipine infusion5 mg/h+2.5 mg/h every 5 min (rapid) to 15 min (gradual); max 15 mg/h. Drop to 3 mg/h once at goal after rapid titration.Advanced aortic stenosis11
Clevidipine infusion1–2 mg/hDouble every 90 s at first; near goal, smaller steps every 5–10 min. Most respond at 4–6 mg/h; most patients needed ≤ 16 mg/h.Soy or egg allergy, defective lipid metabolism, severe aortic stenosis12
Labetalol IV push20 mg over 2 min40 or 80 mg every 10 min to a total of 300 mg. Or infuse at 2 mg/min.Asthma, overt heart failure, heart block above first degree, cardiogenic shock, severe bradycardia13
Esmolol infusion500 mcg/kg over 1 min, then 50 mcg/kg/minFor immediate control: 1 mg/kg over 30 s, then 150 mcg/kg/min. Max 300 mcg/kg/min for hypertension.See label; labeled for perioperative hypertension14

Unreviewed doses. Verify against the current label and your institution's protocol before giving anything.

Doses from the FDA labels.11,12,13,14 Nitroglycerin and nitroprusside doses are not given here; use your institutional protocol and the label.

Nicardipine or labetalol?

In CLUE (n = 226 ED patients with SBP ≥ 180, 63% with organ damage), the physician set a target range before randomization. Within 30 minutes, more nicardipine patients reached it (91.7% vs 82.5%). Rescue drug use did not differ (15.5% vs 22.4%), and heart rates were slower with labetalol.15

Severe hypertension without organ damage

  • Treat as an outpatient. The guideline recommends starting, restarting or intensifying oral medication in a timely way.1,2
  • ACEP 2025: consider starting an outpatient antihypertensive at discharge (Level C), and refer every patient for follow-up (consensus).3,4
  • Hospital referral did not help. In 58,535 office patients with BP ≥ 180/110, a propensity-matched comparison found no difference in major cardiovascular events at 7 days, 30 days or 6 months between those sent home and those sent to hospital. Those sent to hospital were admitted more often.16
  • IV treatment may harm. In hospitalized patients who developed severe hypertension without organ damage, IV antihypertensives were linked to more myocardial injury (5.9% vs 3.6%; HR 1.6), with no difference in stroke, kidney injury or death.17

Pitfalls

  • Calling it an emergency because of the number alone. Organ damage defines it.1,5
  • Normalizing BP in the first hour when there is no compelling condition. The limit is a 25% fall in SBP.1,2
  • Being too slow in aortic dissection. The target is SBP under 120 within the first hour.1,2
  • Giving IV pushes to an asymptomatic patient with severe hypertension.1,17
  • Applying the general targets to stroke, intracerebral hemorrhage or pregnancy, which have their own.1,2
  • Discharging without follow-up. Most office patients with severe hypertension still had uncontrolled BP 6 months later.3,16

How strong is the evidence?

The staged BP targets for hypertensive emergency are strong recommendations, but they rest on limited data (level C-LD).1,2 The ACEP recommendation to start oral drugs at discharge is Level C, with no Level A or B recommendations.4 The evidence against treating the number without organ damage is observational.16,17 The 2025 guideline's full text was not openly accessible, so recommendations here come from its published summary and are cited to both.1,2

On-shift teaching

Questions to ask a learner at the bedside. Tap a question to see the answer. Every answer uses facts cited above.

Q1A patient has BP 210/125 and no symptoms. Is this a hypertensive emergency?
No. An emergency needs acute target organ damage. This is severe hypertension, treated as an outpatient with oral medication.1,2
Q2Without a compelling condition, how far should SBP fall in the first hour?
No more than 25%. Then, if stable, to under 160/100 over the next 2–6 hours, and cautiously to 130–140 over the next 24–48 hours.1,2
Q3What is the BP target in acute aortic dissection?
SBP under 120 mm Hg within the first hour. For most other compelling conditions it is under 140.1,2
Q4What is the most common organ injury in ED hypertensive emergencies?
Ischemic stroke (28.1%), then pulmonary edema or acute heart failure (24.1%). Aortic dissection was the least common (1.8%).7
Q5In CLUE, how did nicardipine compare with labetalol?
More nicardipine patients reached the physician-set target range within 30 minutes (91.7% vs 82.5%). Rescue drug use did not differ.15
Q6Should you start an oral antihypertensive for asymptomatic elevated BP at discharge?
Consider it. ACEP 2025 gives this a Level C recommendation and advises outpatient follow-up for every patient.3,4

References

Evidence base

What this page is built on

17 sources, cited 81 times. Dots are sources, filled by how far each was read; stronger color means a larger share of the citations. Tap a tier to see its sources.

Read in full · 7Abstract read · 8Record only · 2Link checked · 0

Checked by the writer, not a physician. The dots show how each source was read, not that anyone has confirmed the claims.

How this page was made
  • Written from scratch. No source text was copied; facts are restated and cited.
  • The 2025 AHA/ACC guideline's full text could not be retrieved (publisher sites blocked automated access), so recommendations and their class and level come from Guideline Central's published summary. Each is cited to both. The guideline's IV drug table could not be read, so drug choices come from a 2025 open-access review of guidelines and doses from FDA labels.
  • The ACEP 2025 clinical policy's full text was not openly accessible; its recommendations come from the ACEP Now summary by the writing committee chair.
  • Trial and cohort results were checked against their PubMed abstracts. No Tier A or B FOAM page on hypertensive emergency could be found or reached, so none is cited.
  • Figure 1 was drawn for this page from the guideline's targets. A Wikimedia Commons fundus photograph was considered but not used, because its findings could not be confirmed to match a caption.
  • Adults only. Pediatric hypertensive emergencies are managed differently and are not covered.
  • Not for clinical use.
Not for clinical use

AI-generated draft. Not reviewed by a physician. This page is for education only and may contain errors, including in doses. Do not use it to diagnose, treat or make decisions about any patient. Rely on your own clinical judgment, your institution's protocols and current drug labeling. Reading this page does not create a physician-patient relationship. Full terms