Hypertensive Emergency Nursing Guide

Emergency vs Urgency — The Critical Distinction

Hypertensive EMERGENCY: Severely elevated BP (usually >180/120 mmHg) WITH acute end-organ damage. Requires immediate IV treatment in ICU/HDU.

Hypertensive URGENCY: Severely elevated BP (>180/120 mmHg) WITHOUT end-organ damage. Manage with oral agents; reduce BP over 24–48 hours.

End-Organ Damage — What to Look For

Organ	Signs of Damage	Investigation
Brain	Headache, confusion, seizures, focal deficit, hypertensive encephalopathy	CT head, neurological exam
Heart	Chest pain (ACS/dissection), acute LVF, pulmonary oedema, new ECG changes	ECG, troponin, CXR
Aorta	Tearing/ripping chest/back pain, pulse differential, BP differential arms	CT angiography urgent
Kidneys	Rising creatinine, haematuria, proteinuria, oliguria	Creatinine, urinalysis
Eyes	Visual disturbance, papilloedema on fundoscopy, flame haemorrhages	Fundoscopy
Pregnancy	Headache, visual changes, RUQ pain, oedema >20 wks gestation	Eclampsia screen, fetal assessment

BP Classification (JNC/ESH)

Category	Systolic	Diastolic
Normal	<120	<80
Elevated	120–129	<80
Stage 1	130–139	80–89
Stage 2	≥140	≥90
Hypertensive Crisis	≥180	≥120

Nursing Assessment

Immediate Assessment Checklist

BP both arms: >20 mmHg difference → suspect aortic dissection immediately
Neurological status: GCS, pupils, focal deficits, signs of hypertensive encephalopathy
Cardiovascular: HR, rhythm, JVP, lung crepitations (LVF), heart sounds (new murmur)
Symptoms: Chest/back pain character, headache location, visual changes, dyspnoea onset
Obstetric history: Gestation in any woman of childbearing age — pre-eclampsia/eclampsia
Medication history: Adherence, recent drug changes, cocaine/stimulant use, MAOI interactions
Fundoscopy: Grade III–IV retinopathy confirms emergency; document papilloedema if present

Emergency Investigations

Investigation	Purpose
12-lead ECG	LVH, ischaemia, strain pattern, arrhythmia
Troponin I/T	Rule out ACS as precipitant or end-organ damage
U&E, creatinine, eGFR	Hypertensive nephropathy, baseline before IV drugs
FBC	Microangiopathic haemolytic anaemia (MAHA) — fragmented RBCs
Urinalysis (dip + micro)	Proteinuria, haematuria → renal involvement
CXR	Pulmonary oedema, cardiomegaly, mediastinal widening
CT Head (non-contrast)	Haemorrhagic stroke, hypertensive encephalopathy
CT Aorta (contrast)	If dissection suspected — chest/back pain + arm BP differential
LFTs + urate	Pre-eclampsia screen in pregnant patients

Feature	Hypertensive Encephalopathy	Ischaemic/Haemorrhagic Stroke
Onset	Gradual over hours	Sudden (seconds–minutes)
Focal deficits	Usually absent or fluctuating	Usually present and fixed
Headache	Severe, progressive	Variable
Seizures	Common	Less common
Response to BP reduction	Symptoms improve	Rapid BP reduction harmful
CT findings	PRES pattern (posterior white matter oedema)	Ischaemia or haemorrhage

CAUTION: Do NOT rapidly reduce BP in acute ischaemic stroke unless BP >220/120 (or >185/110 if thrombolysis planned). Rapid reduction worsens ischaemic penumbra.

BP Reduction Targets

Key Principle: Do NOT rapidly normalise BP. Autoregulation is reset — rapid drops cause ischaemia. General rule: reduce MAP by ≤25% in first hour, then gradual reduction over 2–6 hours.

Target BP by Emergency Type

Emergency Type	Initial Target	Timeframe	Notes
Hypertensive encephalopathy	MAP ↓25% or SBP 160/100	1–2 hrs	Labetalol or nicardipine
Aortic dissection	SBP 100–120 mmHg, HR <60	As fast as possible	Esmolol + vasodilator; beta-blocker FIRST
Acute LVF / pulmonary oedema	MAP ↓25% rapidly	Minutes	GTN first choice; avoid reflex tachycardia
Hypertensive nephropathy	MAP ↓20–25%	Several hrs	Avoid ACEi/ARB acutely; labetalol/nicardipine
Acute ischaemic stroke	Only if BP >220/120; gentle reduction to 185/110 if thrombolysis	Cautious	Labetalol preferred; avoid nifedipine SL
Haemorrhagic stroke	SBP target 140 mmHg	Within 1 hr of onset	Labetalol, nicardipine or clevidipine
Pre-eclampsia / eclampsia	SBP <160, DBP <110	<1 hr	Hydralazine IV or labetalol IV; MgSO₄ for seizures

Nursing Monitoring in Hypertensive Emergency

Continuous arterial line BP monitoring (preferred) or NIBP every 5–15 minutes
Continuous cardiac monitoring — 12-lead ECG on admission, continuous rhythm monitoring
Neurological observations every 30–60 minutes — GCS, pupils, focal deficit
Urine output — hourly via IDC; target ≥0.5 mL/kg/hr
SpO₂ continuous; supplemental O₂ to maintain SpO₂ >94%
IV access — minimum 2 large-bore IVs; central line for vasoactive drugs
Strict fluid balance charting
Medications: infusion pump mandatory for all IV antihypertensives

IV Antihypertensive Drug Guide

First-Line IV Agents

Drug	Mechanism	Dose	Indications	Avoid in
Labetalol	Alpha + beta blocker	20 mg IV bolus q10min; or infusion 0.5–2 mg/min	Most emergencies, aortic dissection, stroke, pre-eclampsia	Asthma, severe bradycardia, acute LVF
Nicardipine	CCB (dihydropyridine)	5–15 mg/hr infusion	Stroke, SAH, encephalopathy, renal emergency	Severe aortic stenosis
GTN (Nitroglycerin)	Venous + arterial vasodilation	5–200 mcg/min infusion	Acute LVF, pulmonary oedema, ACS	Hypotension, right heart failure, PDE5 inhibitor use
Esmolol	Beta-1 selective blocker (ultra-short)	500 mcg/kg bolus, then 50–200 mcg/kg/min	Aortic dissection, perioperative hypertension, SVT	Asthma, bradycardia, acute decompensated HF
Hydralazine	Direct arteriolar vasodilator	5–10 mg IV q20min	Pre-eclampsia	Aortic dissection, ischaemic heart disease
Clevidipine	Dihydropyridine CCB (ultra-short)	1–21 mg/hr infusion	Perioperative, stroke, ICH	Lipid disorders (lipid emulsion)
Sodium nitroprusside	Nitric oxide donor	0.25–10 mcg/kg/min (light-protected)	Refractory emergencies, ONLY in ICU	Hepatic/renal failure (cyanide toxicity risk)

NEVER use sublingual nifedipine: Unpredictable, precipitous BP drops cause stroke, MI and death. Banned from GCC hypertensive emergency protocols.

Aortic Dissection Rule: Beta-blocker MUST be given before any vasodilator. Vasodilator alone → reflex tachycardia → increased aortic wall stress → extends dissection.

GCC-Specific Context

Hypertension in the GCC

Prevalence: 25–35% of GCC adults hypertensive — among the highest globally
Control rates: Only 30–40% of hypertensive patients achieve controlled BP — high emergency presentation rate
Comorbidities: Diabetes in 15–25% — accelerates end-organ damage (nephropathy, retinopathy)
Medication non-adherence: Major factor in GCC presentations — cultural and financial barriers to long-term drug therapy
Ramadan fasting: BP medications often self-discontinued during Ramadan — surge in hypertensive emergencies post-Ramadan and during fasting month
Heat exposure: Summer dehydration and heat stress exacerbate hypertension and end-organ risk

Examination Tips — DHA/SCFHS/QCHP

Emergency vs urgency distinction — ALWAYS tested
BP reduction target: ≤25% MAP reduction in first hour — classic MCQ
Aortic dissection: beta-blocker FIRST rule
Stroke: do NOT aggressively reduce BP unless >220/120 or pre-thrombolysis
Hydralazine for pre-eclampsia — common GCC exam answer
Sublingual nifedipine contraindication — frequent distractor

Exam MCQs — DHA / SCFHS / QCHP

Q1. A patient presents with BP 210/130 mmHg, severe headache, papilloedema and confusion. What is the CORRECT BP reduction target for the first hour of treatment?

A) Normalise BP to 120/80 mmHg within 1 hour B) Reduce MAP by no more than 25% in the first hour C) Reduce SBP by 50% within 30 minutes D) Maintain BP above 180 mmHg to preserve cerebral perfusion

✅ B — Reduce MAP by ≤25% in first hour. Autoregulation is set at higher levels in chronic hypertension — rapid normalisation causes cerebral, renal and coronary ischaemia.

Q2. A patient with suspected aortic dissection has BP 195/115 mmHg and HR 95 bpm. Which is the CORRECT sequence of treatment?

A) GTN infusion first to rapidly reduce BP B) Esmolol (beta-blocker) first to control heart rate, then add vasodilator C) Sublingual nifedipine for rapid BP reduction D) Hydralazine IV — direct-acting vasodilator is first line

✅ B — Beta-blocker MUST come before vasodilator in aortic dissection. Vasodilator alone causes reflex tachycardia which increases dp/dt (aortic wall stress), extending the dissection.

Q3. A 28-week pregnant patient presents with BP 172/115 mmHg, severe headache and 3+ proteinuria on dipstick. Which drug is MOST appropriate for acute BP control?

A) Enalapril IV B) Sodium nitroprusside C) Hydralazine IV or Labetalol IV D) Amlodipine 10 mg oral

✅ C — Hydralazine IV or Labetalol IV are standard first-line agents for hypertensive emergency in pregnancy (pre-eclampsia). ACE inhibitors are absolutely contraindicated in pregnancy. Nitroprusside carries cyanide toxicity risk to the fetus.

Q4. A nurse is preparing to administer sublingual nifedipine to a patient with hypertensive urgency as ordered by a junior doctor. What should the nurse do?

A) Administer as ordered — sublingual nifedipine is standard management B) Crush nifedipine tablet for faster absorption C) Question the order — sublingual nifedipine is contraindicated due to risk of catastrophic BP drop causing stroke or MI D) Administer only if SBP is above 200 mmHg

✅ C — Sublingual nifedipine causes an unpredictable precipitous BP drop that can cause cerebrovascular accident or myocardial infarction. It is banned from hypertensive emergency management in all major guidelines. The nurse has a duty to question and refuse unsafe orders.

🚨 Hypertensive Emergency