Add a suitable educational image showing blood-pressure assessment, target-organ injury and emergency treatment here.
Why this topic matters: A very high blood-pressure reading is not automatically a hypertensive emergency. The emergency is defined by acute or worsening target-organ injury—brain, heart, aorta, kidneys, retina or pregnancy-related organs—not by the number alone. Conversely, a patient can have severe organ injury without an extremely high reading if pressure has fallen rapidly from a high baseline. Emergency medical students must measure blood pressure accurately, recognise subtle organ injury, avoid dangerous rapid normalisation, select monitored treatment, and communicate deterioration early.
Learning objectives
- Define hypertension, severe asymptomatic elevation, hypertensive urgency as a historical term, and hypertensive emergency.
- Explain how vascular stress, endothelial injury, autoregulation failure and neurohormonal activation produce acute organ damage.
- Measure and confirm blood pressure safely, identify measurement artefacts and obtain a focused history.
- Recognise neurological, cardiac, pulmonary, renal, aortic, retinal and pregnancy-related red flags.
- Perform a structured ABCDE assessment and decide when the patient needs resuscitation, high-dependency or intensive-care monitoring.
- Choose investigations that answer two questions: is acute target-organ damage present, and what is causing the pressure rise?
- Describe cautious blood-pressure reduction targets and why treatment must be titrated rather than abruptly normalised.
- Compare common IV antihypertensive medicines, their indications, contraindications, monitoring needs and adverse effects.
- Outline condition-specific care for aortic dissection, acute coronary syndrome, pulmonary oedema, stroke, intracranial haemorrhage, kidney injury, pregnancy and sympathomimetic toxicity.
- Plan nursing surveillance, documentation, patient education, discharge planning and prevention of recurrence.
1. Definitions and essential distinctions
Hypertension is persistently elevated arterial blood pressure confirmed by appropriate repeated measurements or out-of-office monitoring. Thresholds differ slightly between guidelines and populations; apply the current Uganda and facility protocol rather than diagnosing from one hurried triage reading.
| Term | Meaning | Emergency implication |
|---|---|---|
| Elevated blood pressure | A reading above the person’s usual or guideline range, sometimes caused by pain, anxiety, exertion, a full bladder, stimulants or poor technique. | Repeat correctly and search for symptoms and acute organ injury before giving emergency medicine. |
| Severe asymptomatic elevation | Markedly elevated BP without evidence of acute target-organ damage. Older texts often call this hypertensive urgency. | Usually needs confirmation, treatment of reversible contributors, oral long-term planning and timely follow-up—not reflex IV medication or rapid normalisation. |
| Hypertensive emergency | Severe BP elevation with acute or worsening damage to a vital organ, such as encephalopathy, intracranial haemorrhage, acute pulmonary oedema, myocardial ischaemia, aortic dissection, acute kidney injury or eclampsia. | Monitored resuscitation and carefully titratable parenteral therapy, with the reduction rate adapted to the organ involved. |
| Malignant or accelerated hypertension | Severe hypertension with rapidly progressive small-vessel injury, classically retinal haemorrhages, cotton-wool spots or papilloedema, often with kidney or brain involvement. | Medical emergency; document visual symptoms and obtain urgent senior review. |
| White-coat or masked hypertension | BP is high in the clinic but not outside, or normal in clinic but high at home/work. | Relevant to diagnosis and prevention, but does not explain acute organ injury; use validated out-of-office monitoring when stable. |
Core safety rule: Treat the patient and the injured organ, not a single number. A patient with 220/120 mmHg and no acute organ injury is managed differently from a patient with 170/100 mmHg and aortic dissection, intracranial bleeding or pulmonary oedema.
2. Why a pressure rise becomes dangerous
2.1 Normal autoregulation
- The brain, kidneys and heart normally maintain relatively stable blood flow across a range of mean arterial pressures by changing arteriolar tone.
- People with long-standing hypertension adapt to higher pressures; their autoregulatory range shifts upward.
- A sudden fall to a “normal” pressure can therefore cause cerebral, coronary or renal hypoperfusion in a chronically hypertensive patient.
- A sudden rise above the upper autoregulatory limit overwhelms vasoconstriction, damages endothelium and increases capillary leakage.
2.2 Pathophysiological sequence
- Sympathetic activation, renin–angiotensin–aldosterone activation, catecholamines, fluid retention or a rapid withdrawal of antihypertensive treatment raise vascular tone or circulating volume.
- High shear stress disrupts vascular endothelium and exposes pro-inflammatory, pro-thrombotic surfaces.
- Arteriolar fibrinoid necrosis, vasoconstriction and microvascular thrombosis reduce tissue perfusion.
- Blood–brain barrier disruption produces headache, confusion, seizures, visual disturbance or posterior reversible encephalopathy syndrome.
- Increased left-ventricular afterload and myocardial oxygen demand cause ischaemia, acute left-ventricular failure, pulmonary oedema or dysrhythmia.
- High aortic wall stress may extend an aortic dissection; the associated pain and catecholamine surge can further raise BP.
- Renal arteriolar injury reduces filtration, activates more renin and produces a self-amplifying cycle of hypertension, haematuria, proteinuria and acute kidney injury.
3. Causes, risk factors and precipitating situations
3.1 Common causes
- Previously diagnosed hypertension that is untreated, undertreated, poorly monitored or complicated by missed doses.
- Inability to obtain medicines because of cost, stock-outs, transport problems, displacement, stigma or misunderstanding of an asymptomatic disease.
- Incorrect dose, drug interaction, vomiting, malabsorption or abrupt withdrawal of clonidine, beta-blocker or other prescribed treatment.
- Kidney disease, glomerulonephritis, renovascular disease, dialysis-related fluid overload or acute urinary obstruction.
- Endocrine causes: phaeochromocytoma, primary aldosteronism, Cushing syndrome, thyroid storm, hyperparathyroidism or adrenal disease.
- Pregnancy-related hypertension: chronic hypertension, gestational hypertension, pre-eclampsia, severe pre-eclampsia and eclampsia.
- Obstructive sleep apnoea, severe pain, urinary retention, hypoxia, hypercapnia, withdrawal states and untreated anxiety.
3.2 Drugs and toxins
| Exposure | Examples and mechanism | Clues or action |
|---|---|---|
| Sympathomimetics | Cocaine, amphetamines, methamphetamine, some decongestants and energy products. | Agitation, sweating, tachycardia, chest pain, hyperthermia; calm environment, benzodiazepine-based specialist treatment and careful BP control. |
| Medicines that raise BP | NSAIDs, corticosteroids, combined hormonal medicines, erythropoietin, calcineurin inhibitors, some antidepressants and herbal stimulants. | Ask specifically and reconcile all prescribed, over-the-counter and traditional medicines. |
| Withdrawal | Clonidine, beta-blocker, alcohol, opioids or sedatives. | Autonomic symptoms, tremor, agitation or rebound tachycardia; treat the withdrawal and seek expert advice. |
| Other toxins | Licorice products, monoamine-oxidase interactions, nicotine excess and selected pesticides or toxic exposures. | Use a poison-control pathway and do not give an unconsidered oral medicine. |
3.3 A practical trigger framework: PRESSURE
PRESSURE
P – Pregnancy or postpartum disease · R – Renal disease or fluid overload · E – Endocrine cause or eclampsia · S – Sympathomimetic drugs, sleep apnoea or sepsis · S – Stroke, seizure or intracranial process · U – Uncontrolled chronic hypertension or missed tablets · R – Rupture/dissection or acute cardiac event · E – Errors in measurement, pain, exposure or withdrawal.
P – Pregnancy or postpartum disease · R – Renal disease or fluid overload · E – Endocrine cause or eclampsia · S – Sympathomimetic drugs, sleep apnoea or sepsis · S – Stroke, seizure or intracranial process · U – Uncontrolled chronic hypertension or missed tablets · R – Rupture/dissection or acute cardiac event · E – Errors in measurement, pain, exposure or withdrawal.
4. Target-organ damage: what to look for
| Organ/system | Acute injury patterns | Questions and bedside clues |
|---|---|---|
| Brain | Hypertensive encephalopathy, intracranial haemorrhage, ischaemic stroke, posterior reversible encephalopathy, seizure or cerebral oedema. | New severe headache, confusion, reduced consciousness, seizure, vomiting, focal weakness, speech change, ataxia or visual symptoms. |
| Heart and coronary circulation | Acute coronary syndrome, myocardial injury, left-ventricular failure, pulmonary oedema, dysrhythmia or stress cardiomyopathy. | Chest pressure, dyspnoea, orthopnoea, diaphoresis, syncope, crackles, new murmur, raised JVP, hypoxia or ECG changes. |
| Aorta | Acute aortic syndrome, dissection, intramural haematoma or rupture. | Sudden tearing chest/back pain, pulse or BP difference, new aortic regurgitation murmur, neurological deficit, limb ischaemia or collapse. |
| Lungs | Acute cardiogenic pulmonary oedema and respiratory failure. | Severe breathlessness, inability to lie flat, pink frothy sputum, widespread crackles, low SpO₂, fatigue or inability to speak. |
| Kidneys | Acute kidney injury, haematuria, proteinuria, thrombotic microangiopathy or rapidly falling urine output. | Oliguria, dark/foamy urine, oedema, flank symptoms, nausea, confusion, rising creatinine or electrolyte disturbance. |
| Eyes | Retinal haemorrhages, cotton-wool spots, exudates, papilloedema or acute visual loss. | Ask about blurred vision, scotomata, diplopia and blindness; arrange fundoscopic/ophthalmic assessment. |
| Pregnancy | Placental dysfunction, fetal compromise, pre-eclampsia, eclampsia, HELLP syndrome and pulmonary oedema. | Pregnancy/postpartum status, severe headache, visual symptoms, epigastric/RUQ pain, clonus, seizures, oedema or reduced fetal movement. |
5. Clinical presentation and red flags
5.1 Symptoms
- Headache, especially abrupt, severe, new or associated with vomiting, confusion, focal deficit or visual symptoms.
- Chest pain, back pain, tearing pain, palpitations, exertional dyspnoea, orthopnoea or syncope.
- Breathlessness at rest, cough with frothy sputum, wheeze, cyanosis or inability to speak full sentences.
- Seizure, weakness, facial asymmetry, aphasia, dysarthria, ataxia, altered behaviour or reduced consciousness.
- Oliguria, haematuria, frothy urine, nausea, swelling or sudden weight gain.
- Visual loss, flashing lights, blurred vision or diplopia.
- In pregnancy: severe headache, flashing lights, epigastric pain, vomiting, confusion, seizure or reduced fetal movement.
5.2 Immediate red flags
Activate emergency/resuscitation support immediately: suspected stroke or intracranial bleed; seizure or reduced consciousness; sudden chest/back pain suggesting dissection; acute pulmonary oedema or severe hypoxaemia; ACS with dynamic ECG changes; shock, new focal deficit, unequal pulses, anuria, rapidly deteriorating renal function, papilloedema, severe pregnancy-related hypertension, eclampsia or a rapidly changing patient.
6. Accurate blood-pressure assessment
A diagnosis and a dangerous treatment decision can both be wrong if the measurement is wrong. Take time to repeat a high value unless the patient has an immediately life-threatening syndrome that requires simultaneous action.
| Step | Correct technique | Common error and consequence |
|---|---|---|
| Prepare | Let the patient rest quietly for about five minutes when clinically possible; explain the procedure and reduce talking. | Measuring during pain, exertion, panic or a procedure can overestimate pressure. |
| Position | Back supported, feet flat, legs uncrossed, arm supported at heart level, sleeve removed rather than rolled tightly. | Unsupported arm or crossed legs may raise the reading. |
| Cuff | Use the correct bladder width and length for the arm; use a validated device and check batteries/zero where relevant. | A cuff that is too small produces a false high; a cuff too large can produce a false low. |
| Repeat | Take at least two readings one minute apart; compare both arms initially when possible and document position, arm, cuff and device. | Acting on one outlier can expose a patient to unnecessary IV medicine. |
| Pulse and context | Record heart rate and rhythm, pain score, oxygenation, temperature, medications, pregnancy status and symptoms. | BP without clinical context cannot determine emergency status. |
| Orthostatic assessment | When safe and relevant, compare lying/sitting with standing measurements in suspected autonomic dysfunction or over-treatment. | Do not stand an unstable, dizzy, shocked or neurologically compromised patient. |
7. Focused history
| History domain | Ask specifically | Why it changes management |
|---|---|---|
| Onset and trend | When was the high reading first noticed? Sudden or gradual? What was the person’s usual BP? | A rapid rise, rapid fall or long-standing baseline changes the autoregulatory risk. |
| Neurological symptoms | Headache, confusion, seizure, weakness, speech change, gait difficulty, visual loss, vomiting or collapse? | Determines stroke, encephalopathy or intracranial haemorrhage pathway. |
| Cardiorespiratory symptoms | Chest/back pain, dyspnoea, orthopnoea, palpitations, syncope, diaphoresis or frothy sputum? | Searches for ACS, dissection, pulmonary oedema and dysrhythmia. |
| Renal symptoms | Urine volume and colour, foamy urine, swelling, flank pain, dialysis or recent dehydration? | Identifies AKI, glomerular disease and fluid strategy. |
| Pregnancy | Could the patient be pregnant or recently postpartum? Headache, visual symptoms, RUQ/epigastric pain, fetal movement or seizure? | Changes drug choice, BP target, magnesium use and obstetric escalation. |
| Medicines | Names, doses, last doses, missed doses, new medicines, NSAIDs, steroids, contraceptives, decongestants, herbal products and allergies? | Finds withdrawal, interactions, toxicity and adherence barriers. |
| Substances | Cocaine, amphetamines, alcohol withdrawal, nicotine, energy drinks or recreational drugs? | Sympathomimetic toxicity needs a different first-line strategy. |
| Past history | Hypertension, stroke/TIA, kidney disease, diabetes, heart failure, aortic disease, sleep apnoea, endocrine disease and prior hypertensive emergency? | Defines risk, baseline organ function and target reduction tolerance. |
8. ABCDE assessment and first response
- Safety and help: move to a monitored area, call senior emergency/medical, stroke, cardiology, renal or obstetric help according to the presentation, and prepare oxygen, suction, defibrillator and IV access.
- Airway: assess voice, obstruction, vomit, secretions and protective reflexes. Reduced consciousness, seizure or intracranial injury may require airway protection.
- Breathing: count respiratory rate, inspect effort, check SpO₂, auscultate, look for frothy sputum and assess for pulmonary oedema, asthma, pneumonia or pneumothorax.
- Circulation: repeat BP in both arms if dissection is possible, check pulse/rhythm, capillary refill, skin, JVP, oedema and temperature; obtain IV access and draw bloods without delaying resuscitation.
- Disability: assess AVPU/GCS, pupils, glucose, seizure activity, focal neurology, speech, visual fields and severe headache. Record a baseline neurological examination.
- Exposure: look for trauma, rash, medication patches, needle marks, pregnancy evidence, oedema, unequal pulses, limb ischaemia and retinal findings while maintaining privacy and warmth.
- Reassess: document response to every intervention, repeat BP at an interval suited to severity and use trends rather than a single “improved” reading.
First-aid principle: Keep the patient calm, seated or positioned for the presenting syndrome, do not encourage exertion, do not give someone else’s antihypertensive tablet, do not force oral intake in a neurologically impaired patient, and arrange urgent transfer when red flags are present.
9. Investigations
| Investigation | What it answers | Important interpretation/safety point |
|---|---|---|
| Repeat BP, both arms and monitored trend | Confirms severe elevation, identifies a pressure difference and tracks therapy. | Do not delay treatment for a perfect baseline if the patient is collapsing. |
| 12-lead ECG and continuous rhythm | ACS, LVH, ischaemia, dysrhythmia, heart block or strain. | Repeat when symptoms change; compare previous ECGs. |
| FBC and blood film | Anaemia, infection, thrombocytopenia and microangiopathic haemolysis. | Schistocytes, falling platelets and haemolysis suggest severe vascular injury or HELLP/TMA. |
| Urea, creatinine, eGFR, electrolytes | AKI, chronic kidney disease, potassium and sodium abnormalities. | Trend results; renal dysfunction affects medicine choice and contrast decisions. |
| Urinalysis and urine protein | Blood, protein, casts or infection; renal and pregnancy-related injury. | Send protein quantification where pre-eclampsia or renal disease is suspected. |
| Troponin | Myocardial injury or ACS. | Use serial values with ECG and symptoms; chronic kidney disease can elevate troponin. |
| Chest radiograph and lung ultrasound | Pulmonary oedema, cardiomegaly, pneumonia, pleural disease or alternative causes of dyspnoea. | Do not transport a crashing patient for imaging before stabilisation. |
| CT brain | Intracranial haemorrhage, mass effect or other acute neurological cause. | Check airway, glucose and circulation; follow stroke/bleed pathway. |
| CT angiography | Aortic dissection, pulmonary embolism or selected vascular emergencies. | Assess renal function and contrast risk, but do not delay life-saving specialist decisions. |
| Bedside echocardiography | LV/RV function, pulmonary pressure clues, tamponade, valve catastrophe and volume assessment. | Particularly valuable in shock, chest pain or unexplained pulmonary oedema. |
| Fundoscopy/ophthalmology | Retinal haemorrhage, exudates, papilloedema and visual injury. | Visual symptoms or papilloedema support emergency classification. |
| Pregnancy tests, obstetric assessment and fetal monitoring | Pregnancy status, pre-eclampsia, HELLP and fetal wellbeing. | Involve obstetrics early; maternal stabilisation remains the priority. |
| Toxicology and endocrine tests | Sympathomimetic exposure, phaeochromocytoma or thyroid storm when clinically suggested. | Do not delay initial stabilisation while waiting for specialised assays. |
10. Differential diagnoses and mimics
- Pain, panic, delirium, urinary retention, hypoxia, hypercapnia, sepsis or withdrawal causing transient sympathetic BP elevation.
- Stroke, intracranial haemorrhage, subarachnoid haemorrhage, meningitis, encephalitis, seizure or head injury.
- Acute coronary syndrome, myocarditis, pericarditis, pulmonary embolism, pulmonary oedema, asthma/COPD exacerbation or pneumothorax.
- Aortic dissection, aortic regurgitation, cardiac tamponade or ruptured aneurysm.
- Acute kidney injury, glomerulonephritis, renal artery stenosis, dialysis-related volume overload or urinary obstruction.
- Preeclampsia/eclampsia, HELLP syndrome and other pregnancy-related emergencies.
- Medication error, cuff error, white-coat hypertension or an isolated high reading with no injury.
11. Treatment goals and reduction strategy
Targets are syndrome-specific and must follow the current local or national protocol. The general approach in a typical hypertensive emergency is controlled reduction rather than abrupt normalisation.
| Situation | General treatment principle | Why caution is needed |
|---|---|---|
| Most non-pregnant emergencies | Use a titratable IV medicine in a monitored setting; many protocols aim for no more than about 20–25% reduction in MAP during the first hour, then gradual reduction over the next day. | Over-correction can cause cerebral, coronary or renal ischaemia, especially in chronic hypertension. |
| Aortic dissection | Reduce shear stress urgently: control heart rate first with a beta-blocker, then add a vasodilator if needed under specialist care; use an organ-perfusion-aware SBP target. | Vasodilator before rate control may cause reflex tachycardia and increase aortic shear. |
| Intracranial haemorrhage or stroke | Use the stroke/neurosurgical pathway and a carefully chosen target based on bleed type, thrombolysis eligibility, ICP and perfusion. | Both high pressure and excessive lowering can worsen neurological injury. |
| Acute pulmonary oedema/ACS | Support oxygenation, use appropriate vasodilator/diuretic/ACS treatment and treat the trigger while monitoring perfusion. | Hypotension, RV infarction and preload dependence make nitrates unsafe in selected patients. |
| Pregnancy/eclampsia | Promptly treat severe BP, prevent and treat seizures with magnesium according to obstetric protocol, assess mother and fetus, and coordinate delivery planning. | Drug choice and timing must protect maternal and fetal circulation. |
12. Intravenous antihypertensive medicines
Selection depends on the injured organ, pulse, cardiac function, renal function, pregnancy, availability and clinician expertise. Doses below are educational examples, not a substitute for the hospital formulary or a prescriber’s order.
| Medicine/class | Useful situations | Major cautions and nursing monitoring |
|---|---|---|
| Nicardipine IV | Titratable arterial vasodilation for many neurological or general hypertensive emergencies. | Monitor BP, tachycardia, flushing, headache and infusion site; caution in acute heart failure or severe aortic stenosis. |
| Labetalol IV | Combined alpha/beta blockade; commonly considered in neurological emergencies, pregnancy and selected general cases. | Check pulse, bronchospasm, heart block, acute decompensated HF and hypoglycaemia masking; avoid in severe bradycardia or cardiogenic shock. |
| Esmolol IV | Very short-acting beta-blocker, especially when rapid heart-rate control is needed in aortic syndromes. | Continuous ECG/BP; watch bradycardia, AV block, bronchospasm and low output. |
| Nitroglycerin IV | Hypertensive ACS or acute pulmonary oedema with adequate BP; reduces preload and myocardial ischaemic burden. | Headache, hypotension, RV infarction, severe aortic stenosis and recent PDE-5 inhibitor use are important cautions. |
| Sodium nitroprusside IV | Potent, rapidly titratable vasodilator in selected specialist/critical-care situations. | Needs close monitoring; prolonged/high exposure risks cyanide/thiocyanate toxicity, and it may worsen intracranial pressure or cause coronary steal. |
| Hydralazine IV | Selected pregnancy-related severe hypertension where protocol recommends it, or specialist-directed alternatives. | Unpredictable response, reflex tachycardia, headache and hypotension; frequent BP and fetal/maternal monitoring. |
| Enalaprilat IV | Selected specialist cases when renin-mediated physiology is suspected and other options are unsuitable. | Avoid in pregnancy, bilateral renal artery stenosis, hyperkalaemia and significant AKI; onset is less easily titrated. |
| Phentolamine IV | Catecholamine excess such as phaeochromocytoma or selected sympathomimetic crises under expert care. | Use after appropriate sedation and specialist review; watch tachycardia and hypotension. |
| Magnesium sulfate | Seizure prevention/treatment in eclampsia and severe pre-eclampsia according to obstetric protocol; it is not a routine antihypertensive. | Monitor respiratory rate, reflexes, urine output and serum levels when indicated; calcium must be available for toxicity. |
Medicine safety: Use a pump, label every infusion, record concentration and titration time, recheck BP after each change, confirm IV patency, and document why a medicine was selected or withheld. Never stack short-acting agents without a clear plan.
13. Condition-specific emergency management
13.1 Acute aortic dissection
- Call vascular/cardiothoracic and critical-care teams; keep the patient at rest, provide analgesia as prescribed and monitor both arms.
- Obtain ECG, urgent imaging and bedside echocardiography when available, while assessing pulses, neurological status, renal perfusion and limb ischaemia.
- Reduce shear by controlling heart rate first with a short-acting beta-blocker under continuous monitoring, then add a vasodilator if pressure remains high.
- Avoid isolated vasodilator treatment that provokes reflex tachycardia. Prepare for urgent surgical or endovascular management.
13.2 Acute coronary syndrome and pulmonary oedema
- Perform ABCDE, upright positioning if perfusion allows, continuous ECG, repeat BP and urgent 12-lead ECG/troponin.
- Titrate oxygen only for hypoxaemia or respiratory distress; prepare CPAP/NIV for cardiogenic pulmonary oedema when airway protection and BP are adequate.
- Use prescribed nitrates when hypertensive and not contraindicated; assess for RV infarction, severe aortic stenosis, hypotension and PDE-5 exposure.
- Give ACS antiplatelet, anticoagulant and reperfusion treatment only through the approved protocol, and escalate shock or refractory hypoxia.
13.3 Acute neurological emergency
- Record last-known-well time, glucose, GCS, pupils, focal findings, seizure activity and anticoagulant use; activate the stroke/bleed pathway.
- Keep the patient nil by mouth until swallow safety is assessed, protect the airway, treat fever/hypoglycaemia and arrange urgent brain imaging.
- Use an IV agent and target appropriate to haemorrhage, ischaemic stroke, thrombolysis eligibility and specialist advice; do not use a one-number rule.
- Watch for deteriorating consciousness, vomiting, worsening headache, unequal pupils, new weakness or seizure and prepare for neurocritical-care escalation.
13.4 Pre-eclampsia and eclampsia
- Call obstetric, anaesthetic and neonatal teams; place the patient in a safe lateral position during seizure, protect from injury and do not restrain or place objects in the mouth.
- Assess airway, breathing, BP, urine output, reflexes, clonus, headache, vision, epigastric/RUQ pain, fetal movement and signs of pulmonary oedema.
- Give magnesium sulfate for seizure prevention/treatment and an approved antihypertensive such as labetalol, hydralazine or nifedipine according to the local obstetric protocol.
- Monitor respiratory rate, oxygenation, tendon reflexes, urine output, fluid balance, magnesium toxicity and fetal wellbeing; prepare calcium gluconate when magnesium is used.
- Delivery planning follows maternal stabilisation and obstetric assessment; severe hypertension is treated even while definitive planning is underway.
13.5 Sympathomimetic or phaeochromocytoma crisis
- Reduce noise and stimulation, manage hyperthermia, check glucose and obtain ECG; use calm communication and a safe environment.
- Call toxicology/critical-care help. Benzodiazepine-based sedation is often used to reduce central sympathetic drive when prescribed.
- Do not give a pure beta-blocker before alpha control in suspected phaeochromocytoma; specialist-directed phentolamine or another agent may be required.
- Look for ACS, dysrhythmia, stroke, rhabdomyolysis, metabolic acidosis and hyperthermia.
13.6 Acute kidney injury and fluid overload
- Measure urine output accurately, review nephrotoxins and recent fluids, check potassium/acid-base status and assess dialysis access.
- Use cautious BP lowering and avoid nephrotoxic or renally inappropriate medicines; involve renal specialists early if severe hyperkalaemia, acidosis, pulmonary oedema or uraemic symptoms occur.
- Do not assume oedema always means intravascular overload; combine JVP, lung findings, weight, ultrasound, renal trend and response to therapy.
14. Nursing management
14.1 Priority observations
- BP frequency, arm/cuff/device, MAP if relevant, pulse/rhythm, respiratory rate, SpO₂, temperature and pain score.
- Neurological observations: GCS/AVPU, pupils, limb power, speech, headache, seizure activity, behaviour and visual complaints.
- Cardiorespiratory findings: chest pain, work of breathing, crackles, JVP, oedema, urine output, skin temperature and capillary refill.
- Fluid balance, hourly urine output in critical illness, daily weight when appropriate, renal trend and electrolyte results.
- Infusion concentration, pump rate, IV site, line patency, titration time, response and adverse effects.
- Pregnancy-specific maternal observations, reflexes, clonus, fetal monitoring and magnesium toxicity checks.
14.2 Nursing interventions and rationales
| Intervention | Rationale and practical action |
|---|---|
| Establish a monitored environment | Allows rapid detection of hypotension, dysrhythmia, hypoxia or neurological decline; keep emergency equipment available. |
| Use accurate, repeated BP technique | Prevents over-treatment from artefact and identifies response to titration; document arm, cuff, position and symptoms. |
| Maintain neurological checks | Detects stroke, encephalopathy, bleeding or treatment-related hypoperfusion early; escalate a change immediately. |
| Administer IV medicine safely | Check the prescription, concentration, allergies, pulse, BP, renal function, pregnancy status, IV patency and pump settings; use an independent double-check where required. |
| Protect airway and oxygenation | Position for the syndrome, suction when indicated, titrate oxygen to target and reassess after each change; prepare NIV or intubation support. |
| Manage fluids carefully | Record input/output and avoid routine boluses in pulmonary oedema or renal failure; discuss any deterioration in urine output or respiratory status. |
| Communicate with SBAR | State the BP trend, symptoms, organ findings, treatment, response and exact request; this reduces delay in specialist review. |
| Support patient and family | Explain why gradual treatment is safer, reduce fear, use an interpreter where needed and involve family in medicine and follow-up teaching with consent. |
15. Complications of treatment and disease
| Complication | Warning signs | Priority response |
|---|---|---|
| Cerebral hypoperfusion | Dizziness, confusion, syncope, new weakness, reduced GCS or seizure after pressure reduction. | Stop/adjust titration as prescribed, repeat ABCDE and call senior/critical-care help. |
| Myocardial ischaemia | Chest pain, dynamic ST/T changes, dysrhythmia, diaphoresis or rising troponin. | ACS pathway, ECG monitoring and urgent cardiology review. |
| Acute kidney injury | Oliguria, rising creatinine, hyperkalaemia, acidosis or fluid overload. | Review perfusion, medicine, contrast and renal plan; escalate early. |
| Pulmonary oedema | Increasing work of breathing, crackles, falling SpO₂, frothy sputum or fatigue. | Upright position, oxygen/NIV when appropriate, urgent review and treat cardiac trigger. |
| Arrhythmia | Bradycardia, tachycardia, palpitations, syncope or broad-complex rhythm. | Continuous ECG, correct electrolytes and follow ALS/cardiology pathway. |
| Medication toxicity | Severe hypotension, bronchospasm, headache, flushing, metabolic acidosis or altered consciousness. | Stop/hold according to protocol, maintain airway and activate senior support. |
| Rebound hypertension | Rapid recurrence after short-acting medicine or missed chronic doses. | Review half-life, transition plan, adherence and secondary causes; do not repeatedly chase numbers without a plan. |
16. Disposition and handover
- Resuscitation/ICU/HDU: ongoing IV titration, shock, pulmonary oedema, invasive monitoring, rapidly changing neurology, aortic syndrome, eclampsia or major organ failure.
- Monitored ward: stabilised emergency with ongoing IV-to-oral transition, serial renal/neurological/cardiac assessment or a significant precipitant requiring treatment.
- Discharge or observation: repeated high BP without acute organ injury only after symptoms are addressed, measurement is confirmed, a long-term medicine plan is made and reliable follow-up is arranged.
- Handover exact BP trend, symptoms, last doses, infusions, investigations, target organ findings, response, allergies, pregnancy status, outstanding tests and escalation plan.
17. Long-term prevention and patient education
- Take antihypertensive treatment as prescribed; never double a missed dose without advice and do not stop clonidine or beta-blockers abruptly.
- Use a validated home BP monitor correctly, record readings with time and symptoms, and bring the log and medicine containers to review.
- Reduce dietary salt, choose minimally processed foods, maintain a healthy weight, exercise safely, stop tobacco and limit alcohol.
- Control diabetes, kidney disease, cholesterol and sleep apnoea; attend retinal, renal and cardiovascular monitoring when recommended.
- Ask before using NSAIDs, decongestants, steroids, stimulants, herbal remedies or recreational drugs.
- Seek urgent care for chest/back pain, weakness or speech change, severe headache with confusion, seizure, breathlessness, new visual loss, very low urine output or pregnancy-related warning symptoms.
- Address barriers: medicine supply, transport, cost, literacy, stigma, language, family support and follow-up access.
18. Worked clinical scenarios
Scenario 1: Severe number without organ injury
A 55-year-old has repeated readings around 210/115 mmHg after a stressful journey but feels well. There is no neurological deficit, chest pain, dyspnoea, visual loss or renal symptom; the cuff and technique are corrected and the reading remains high. The team confirms history, examines for target-organ injury, checks appropriate baseline tests, treats reversible contributors, arranges oral therapy and reliable follow-up, and avoids reflex IV medication or rapid normalisation.
Scenario 2: Hypertensive pulmonary oedema
A 68-year-old presents with sudden breathlessness, BP 220/120, crackles and SpO₂ 78%. The nurse calls for help, sits the patient upright, attaches ECG/SpO₂/BP monitoring, gives titrated oxygen, prepares CPAP, obtains an urgent ECG, and administers prescribed nitrate/diuretic therapy while watching BP, work of breathing, urine output and renal function. ACS and arrhythmia are actively sought.
Scenario 3: Aortic dissection
A patient develops abrupt tearing chest-to-back pain, unequal arm pressures and a new neurological deficit. The team avoids repeated ambulation, obtains two IV lines, monitors both-arm pressure and ECG, gives prescribed analgesia, calls vascular/cardiothoracic specialists and prepares short-acting rate control before any additional vasodilator. The aim is to reduce aortic shear while preserving brain, kidney and limb perfusion.
Scenario 4: Eclampsia
A postpartum patient has BP 185/115, severe headache, flashing lights and a generalised seizure. Staff protect her from injury, place her laterally, call obstetric/anaesthetic/neonatal teams, assess airway and glucose, administer magnesium and approved antihypertensive treatment according to protocol, monitor reflexes/respirations/urine output and plan definitive obstetric care after stabilisation.
Scenario 5: Sympathomimetic crisis
A young adult is agitated, diaphoretic, hyperthermic, tachycardic and hypertensive after suspected stimulant use with chest pain. The team reduces stimulation, checks glucose and temperature, establishes monitoring, obtains ECG/troponin, treats agitation with prescribed sedation and calls toxicology. A pure beta-blocker is not given reflexively before the cause and specialist plan are clarified.
RECHECK-BP
R – Repeat the reading correctly · E – Examine for acute organ injury · C – Call the right senior team · H – Hunt the trigger and history · E – ECG, eyes, enzymes, electrolytes and imaging · C – Choose a titratable, monitored treatment · K – Keep reassessing perfusion and neurology · B – Bring BP down gradually unless a syndrome-specific target applies · P – Plan prevention, medicines and follow-up.
R – Repeat the reading correctly · E – Examine for acute organ injury · C – Call the right senior team · H – Hunt the trigger and history · E – ECG, eyes, enzymes, electrolytes and imaging · C – Choose a titratable, monitored treatment · K – Keep reassessing perfusion and neurology · B – Bring BP down gradually unless a syndrome-specific target applies · P – Plan prevention, medicines and follow-up.
19. Examination and revision questions
- Define hypertensive emergency and explain why the BP number alone does not make the diagnosis.
- Compare severe asymptomatic elevation with acute target-organ damage.
- Explain how chronic hypertension shifts autoregulation and why rapid normalisation can be dangerous.
- List neurological, cardiac, aortic, renal, retinal and pregnancy-related red flags.
- Describe the correct technique for repeating a very high BP.
- Outline the ABCDE assessment and the minimum urgent investigations.
- Discuss the general first-hour reduction principle and why the target changes in dissection, stroke, pulmonary oedema and pregnancy.
- Compare nicardipine, labetalol, esmolol, nitroglycerin, nitroprusside, hydralazine and magnesium sulfate.
- Explain why beta-blockade is prioritised before vasodilation in aortic dissection.
- Plan nursing care for a patient receiving a titratable IV antihypertensive infusion.
- Describe discharge education that reduces recurrence and medicine-related harm.
Key takeaways
- Hypertensive emergency means severe pressure elevation plus acute or worsening target-organ injury.
- Confirm the BP, but never let measurement perfection delay treatment of a collapsing patient.
- Ask about the brain, heart, lungs, aorta, kidneys, eyes and pregnancy at every first assessment.
- Most patients require controlled, titratable reduction—not immediate normalisation.
- Use the organ-specific pathway: aortic dissection, stroke, ACS/pulmonary oedema, renal crisis, eclampsia and stimulant toxicity are not interchangeable.
- IV medicine requires continuous or frequent BP, ECG, neurological, respiratory, renal and infusion-site monitoring.
- Good emergency care includes a sustainable oral regimen, access to medicines, follow-up and prevention of recurrence.
Suggested references
- American Heart Association. Management of Elevated Blood Pressure in the Acute Care Setting: scientific statement and key points.
- European Society of Cardiology. 2024 Guidelines for the Management of Elevated Blood Pressure and Hypertension.
- World Health Organization. Guideline for the pharmacological treatment of hypertension in adults.
- ACC/AHA hypertension guideline: evaluation and management of high blood pressure.
- Use the current Uganda Ministry of Health, emergency-department, obstetric, stroke, renal and critical-care protocols for medicine choice, targets, referral and availability.