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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Accelerated hypertension and hypertensive emergencies

Cardiology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Escalate

Clinic BP at least 180/120 mmHg with retinal haemorrhage/papilloedema or life-threatening symptoms such as new confusion, chest pain, acute heart failure or acute kidney injury needs same-day specialist assessment. Treatment targets are organ-specific; uncontrolled rapid normalisation can cause cerebral, coronary or renal ischaemia.

Synopsis

Separate acute severe blood pressure without organ injury from accelerated hypertension and true emergency, investigate target-organ damage and lower pressure at the right speed.

  • Accelerated (malignant) hypertension is BP at least 180/120 mmHg with retinal haemorrhage and/or papilloedema.
  • A hypertensive emergency is severe BP elevation with acute, ongoing target-organ injury—not a number alone.
  • Same-day referral is required for BP at least 180/120 with retinal changes or life-threatening neurological, cardiac, aortic or renal features.
  • If BP is at least 180/120 without emergency features, investigate target-organ damage promptly and repeat clinic BP or arrange ABPM/HBPM with clinical review within 7 days.
  • Measure BP correctly in both arms initially, repeat after rest with a suitable cuff and assess standing BP when symptoms or treatment make postural hypotension likely.
  • In most hypertensive emergencies, reduce mean arterial pressure by about 20–25% over the first few hours rather than to normal immediately; specific syndromes override this rule.
  • Acute aortic syndrome needs rapid anti-impulse therapy; acute ischaemic stroke, intracerebral haemorrhage and pre-eclampsia/eclampsia have separate BP thresholds and targets.
  • Use titratable IV therapy in a monitored setting for emergency; oral loading or sublingual immediate-release nifedipine can cause dangerous, unpredictable falls and should not be used.

Key red flags

Accelerated hypertension

BP at least 180/120 mmHg plus retinal haemorrhage and/or papilloedema; often accompanied by headache, visual symptoms, renal injury or microangiopathy.

Hypertensive encephalopathy

New confusion, agitation, headache, visual disturbance, nausea/vomiting or seizures with severe hypertension after excluding stroke and other causes.

Cardiac/aortic emergency

Chest/back pain, pulse deficit, acute pulmonary oedema, myocardial ischaemia or new aortic regurgitation requires immediate syndrome-specific care.

Renal/microangiopathic injury

Oliguria, rising creatinine, haematuria/proteinuria, thrombocytopenia or fragmented red cells supports acute organ damage.

Possible phaeochromocytoma

Labile/postural hypertension with headache, palpitations, pallor, diaphoresis or abdominal pain merits same-day specialist assessment under NICE.

Investigation priorities

01
Repeat validated BP in both arms and fundoscopyFirst step

Confirm severe BP, identify inter-arm clues and diagnose accelerated retinal injury.

Management branches

same dayNICE emergency referral

BP at least 180/120 plus retinal haemorrhage/papilloedema or life-threatening neurological, cardiac, aortic or renal features.

  1. First: repeat accurate BP while beginning ABC, neurological, cardiac, volume and fundal assessment; obtain IV access and monitoring.
  2. Next: refer/admit same day to the appropriate acute team and investigate the organ syndrome in parallel.
  3. Next: use titratable IV therapy with a documented syndrome-specific target; in many emergencies aim for MAP reduction around 20–25% over several hours.
  4. Escalation: aortic dissection, stroke/ICH and pregnancy follow their dedicated rapid targets and specialist protocols.

Key medicines

Labetalol IV50 mg IV over 1 minute; repeat at 5-minute intervals if needed to a total maximum 200 mg. Alternatively infuse a 1 mg/mL solution, commonly around 160 mg/hour titrated to response.Avoid with asthma/bronchospasm, marked bradycardia, heart block or decompensated systolic failure; monitor supine because postural hypotension can persist. Syndrome-specific dosing may differ.
Nicardipine IVStart 3–5 mg/hour by continuous IV infusion for 15 minutes, increase by 0.5–1 mg/hour every 15 minutes to response; maximum 15 mg/hour, then reduce to about 2–4 mg/hour maintenance.Continuous monitoring required; may cause tachycardia, headache or hypotension. In acute aortic syndrome, control heart rate/impulse first to avoid reflex shear stress.
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Sources and review status4 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NICE NG136: Hypertension in adults—recommendations180/120 thresholds, same-day referral and 7-day pathway.
  • BIHS position document: Management of hypertensive crisisUK syndrome-specific emergency assessment and controlled reduction.
  • eMC: Labetalol injection SmPCIV bolus/infusion doses and contraindications.
  • eMC: Nicardipine injection SmPCIV titration and maximum dose.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom