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Approach to the Critical Patient
Immediate priorities
Stabilization and monitoring
Airway protection triggers
Agitation or inability to protect airway
Refractory hypoxemia
Breathing threats
Acute pulmonary edema
Respiratory fatigue
Circulation threats
Shock physiology despite severe hypertension
Ongoing chest pain with ischemic ECG changes
IV access and monitoring
Two large-bore peripheral IV lines
Continuous ECG monitoring
Pulse oximetry
Noninvasive BP every 2-5 minutes
Arterial line if titratable infusion anticipated
Definition and classification
Hypertensive crisis framework
Hypertensive emergency definition
Severe BP elevation with acute target-organ injury
BP threshold not required if injury present
Hypertensive urgency definition
Severe BP elevation without acute target-organ injury
Common target-organ injury domains
Central nervous system
Cardiovascular
Renal
Obstetric
Hemodynamic targets
BP reduction strategy
Standard target
Mean arterial pressure reduction 10%-20% in first hour
Additional mean arterial pressure reduction to total 25% by 24 hours
Avoided outcomes
Cerebral hypoperfusion
Myocardial ischemia from rapid afterload drop
Worsening acute kidney injury
Condition-specific targets
Aortic dissection
Systolic BP less than 120 mmHg as fast as tolerated
Heart rate less than 60 beats/min
Acute ischemic stroke not receiving thrombolysis
BP lowering only if marked elevation with symptoms or comorbid indication
Acute ischemic stroke receiving thrombolysis
BP less than 185/110 mmHg before thrombolysis
BP less than 180/105 mmHg for 24 hours after thrombolysis
Intracerebral hemorrhage
Early BP lowering with close neurologic monitoring
Preeclampsia or eclampsia
Systolic BP less than 160 mmHg
Diastolic BP less than 110 mmHg
Consultation and activation triggers
Early specialty involvement
Neurology
Focal neurologic deficit
Concern for stroke or intracranial hemorrhage
Cardiology
Acute coronary syndrome
Acute pulmonary edema with ischemia concern
Vascular surgery or cardiothoracic surgery
Suspected aortic dissection
Obstetrics
Pregnancy with severe-range BP or symptoms
Nephrology
Severe acute kidney injury
Suspected scleroderma renal crisis
Toxicology
Sympathomimetic intoxication
Withdrawal states
PEARLS
High-yield management principles
Confirm target-organ injury before aggressive BP reduction when feasible
Symptoms alone are insufficient without objective injury markers
Recheck BP with proper technique
Appropriate cuff size
Repeat manual measurement
Beta-blocker first in aortic dissection physiology
Avoid reflex tachycardia and increased shear stress from vasodilator alone
History
Presenting features and timeline
Symptom characterization
Neurologic
Headache
Confusion or altered mental status
Seizure
Visual changes
Focal weakness or speech difficulty
Cardiopulmonary
Chest pain
Dyspnea
Orthopnea
Palpitations
Renal
Oliguria
Hematuria
Obstetric
Pregnancy status and gestational age
Right upper quadrant or epigastric pain
Timing
Sudden onset symptoms
Progressive over hours to days
Triggers and contributing factors
Precipitating factors
Medication nonadherence
Missed antihypertensives
Recent discontinuation of beta-blocker or clonidine
Substance exposures
Cocaine
Methamphetamine
Prescription stimulants
Monoamine oxidase inhibitor interactions
Pain and stress states
Severe pain
Panic or severe anxiety
Withdrawal
Alcohol withdrawal
Benzodiazepine withdrawal
Secondary hypertension clues
Secondary causes
Pheochromocytoma or paraganglioma features
Episodic headache
Diaphoresis
Palpitations
Renal causes
Known chronic kidney disease
Recent nephrotoxic exposure
Endocrine causes
Hyperthyroid symptoms
Hyperaldosteronism history
Autoimmune
Scleroderma history
Medications and comorbid risk
Medication and disease context
Current antihypertensive regimen
Last dose timing
Recent dose changes
Cardiovascular risk
Coronary artery disease
Heart failure
Prior stroke or TIA
Renal risk
Baseline creatinine
Dialysis dependence
Physical Exam
Vital signs and global appearance
Clinical severity markers
BP confirmation
Bilateral arm measurements
Repeat after rest
Perfusion status
Cool extremities
Delayed capillary refill
Respiratory distress
Work of breathing
Hypoxemia
Cardiovascular and pulmonary
Cardiopulmonary findings
Heart failure
Pulmonary crackles
Elevated jugular venous pressure
Peripheral edema
S3 gallop
Aortic dissection clues
Pulse deficit
BP differential between arms
New diastolic murmur
Ischemia
Diaphoresis with chest discomfort
Signs of poor perfusion
Neurologic and funduscopic
Neurologic injury screening
Mental status
Delirium
Reduced level of consciousness
Focal deficit
Aphasia
Unilateral weakness
Visual field deficit
Seizure activity
Postictal state
Fundus
Papilledema
Retinal hemorrhages or exudates
Abdominal and renal
Renal and vascular clues
Abdominal bruit
Renal artery stenosis suspicion
Flank tenderness
Renal pathology consideration
Volume status
Dry mucous membranes
Orthostasis
PITFALLS
Common errors
Anchoring on BP number without objective injury
Missing aortic dissection in chest pain with hypertension
Rapid BP reduction in chronic severe hypertension with neurologic symptoms
Differential Diagnosis
Hypertension-related syndromes
Hypertensive target-organ injury syndromes
Hypertensive encephalopathy
Headache with confusion
Seizure
PRES pattern
Acute pulmonary edema
Flash pulmonary edema
Acute heart failure exacerbation
Acute coronary syndrome
NSTEMI
STEMI
Aortic syndromes
Aortic dissection
Intramural hematoma
Acute kidney injury
Malignant hypertension with renal failure
Retinopathy
Vision loss
Papilledema
Mimics and alternative causes
Conditions that present with severe BP elevation
Pain crisis
Renal colic
Trauma
Anxiety or panic
Withdrawal
Alcohol withdrawal
Benzodiazepine withdrawal
Sympathomimetic intoxication
Cocaine-associated toxicity
Amphetamine toxicity
Endocrine crises
Thyroid storm
Pheochromocytoma crisis
Pregnancy-related
Obstetric hypertensive disorders
Preeclampsia with severe features
Eclampsia
HELLP syndrome
Coding alignment
Common coding mappings
Hypertensive emergency ICD-10 I16.1
Hypertensive urgency ICD-10 I16.0
Essential hypertension ICD-10 I10
SNOMED CT concept hypertensive emergency
SNOMED CT concept malignant hypertension
Laboratory Tests
Core evaluation for target-organ injury
Baseline labs
Electrolytes and renal function
Sodium mmol/L
Potassium mmol/L
Creatinine umol/L
Bicarbonate mmol/L
Complete blood count
Hemoglobin for anemia or hemolysis concern
Platelets for HELLP or TMA concern
Urinalysis
Proteinuria
Hematuria
Casts
Cardiac biomarkers
High-sensitivity troponin per local assay
Serial testing for dynamic change
Focused testing by phenotype
Phenotype-driven labs
Suspected preeclampsia or HELLP
AST and ALT
Bilirubin
LDH
Platelets trend
Urine protein quantification
Suspected thrombotic microangiopathy
Peripheral smear for schistocytes
LDH elevation
Haptoglobin reduction
Suspected pheochromocytoma
Plasma free metanephrines in stable setting
Urine fractionated metanephrines in stable setting
Point-of-care tests
Bedside adjuncts
Glucose mmol/L
Neuro deficit mimic assessment
Venous blood gas
pH
pCO2 mmHg
Lactate mmol/L
Interpretation and pitfalls
Common limitations
Isolated proteinuria not specific without clinical context
Troponin elevation possible in demand ischemia and renal dysfunction
Creatinine rise may lag behind acute renal hypoperfusion
Hematuria can occur with malignant hypertension and dissection
Diagnostic Tests
Scoring Systems
Structured decision support
Absence of universal hypertensive emergency score
Diagnosis anchored in objective target-organ injury
Aortic dissection risk tools
Aortic dissection detection risk score as adjunct
Use with D-dimer and imaging pathways per local protocol
Stroke severity tools
NIHSS for suspected acute ischemic stroke
ICH score for intracerebral hemorrhage prognosis
MRI
MRI brain indications
Suspected PRES with nondiagnostic CT
Vasogenic edema pattern
Posterior circulation stroke concern
Diffusion restriction evaluation
Contraindications and logistics
Unstable patient with infusion titration needs
MRI-incompatible devices
CT
CT targets by presentation
CT head noncontrast
Focal neurologic deficit
Severe headache with altered mental status
Seizure with persistent confusion
CT angiography chest abdomen pelvis
Suspected aortic dissection
Chest pain with pulse deficit or mediastinal widening
CT pulmonary angiography
PE concern with hypoxemia and pleuritic pain
Ultrasound (or US)
Point-of-care ultrasound applications
Lung ultrasound
B-lines for pulmonary edema
Pleural effusion
Cardiac ultrasound
LV systolic function
Pericardial effusion and tamponade physiology
Aorta ultrasound
Abdominal aortic aneurysm screening adjunct
Limited sensitivity for thoracic dissection
ECG and chest imaging
Routine cardiopulmonary testing
12-lead ECG
Acute ischemia or infarction patterns
LV hypertrophy with strain
Arrhythmia triggers for targeted therapy
Chest radiograph
Pulmonary edema
Mediastinal widening as dissection clue
Alternative respiratory pathology
Disposition
Level of care decisions
Admission criteria
Hypertensive emergency
ICU or monitored setting with titratable IV therapy
Frequent neurologic reassessment when CNS involvement
Hypertensive urgency
Observation or short-stay if high risk or poor follow-up
Outpatient management if stable and reliable follow-up
Transfer and escalation
Higher-level care triggers
Suspected aortic dissection
Immediate transfer to surgical-capable center if not available
Intracranial hemorrhage
Neurosurgical capability requirement
Refractory BP despite two IV agents
Critical care consultation
Discharge criteria when appropriate
Safe discharge framework
No objective target-organ injury
Symptoms improved with nonemergent measures
Oral regimen established or resumed
Follow-up within 72 hours to 7 days
Clear return precautions documented
Treatment
General strategy
Treatment architecture
Address reversible drivers
Analgesia for severe pain
Anxiolysis for severe anxiety
Withdrawal management pathway
Route selection
IV titratable agents for emergency
Oral agents for urgency
Monitoring during BP lowering
Neuro checks for CNS presentations
Urine output tracking
Frequent electrolytes for prolonged infusions
IV antihypertensive infusions
Titrated vasodilator infusions
Nicardipine IV infusion
Initiate 5 mg/hour
Titrate 2.5 mg/hour every 5-15 minutes
Maximum 15 mg/hour
Preferred phenotypes
Neurologic emergencies
General hypertensive emergency without tachycardia
Precautions
Reflex tachycardia risk
Peripheral edema risk
Clevidipine IV infusion
Initiate 1-2 mg/hour
Titrate by doubling every 90 seconds early as needed
Typical range 4-16 mg/hour
Advantages
Rapid onset and offset
Easy fine titration
Contraindications
Egg or soy allergy
Disordered lipid metabolism
Nitroprusside IV infusion
Initiate 0.3 mcg/kg/min
Titrate 0.5 mcg/kg/min every 5 minutes
Maximum 10 mcg/kg/min
Role limitations
Cyanide or thiocyanate toxicity risk with prolonged use
Avoid in renal failure when possible
Avoid in pregnancy when possible
Nitroglycerin IV infusion
Initiate 5-10 mcg/min
Titrate 5-10 mcg/min every 3-5 minutes
Typical maximum 200 mcg/min
Preferred phenotypes
Acute coronary syndrome
Acute pulmonary edema
Limitations
Less effective for isolated BP control
Headache and tachyphylaxis
IV bolus antihypertensives
Intermittent IV agents
Labetalol IV bolus
Initiate 10-20 mg IV over 2 minutes
Repeat 20-80 mg every 10 minutes as needed
Maximum 300 mg total
Alternative labetalol infusion
Initiate 0.5-2 mg/min
Titrate to effect with close bradycardia monitoring
Contraindications
Asthma with active bronchospasm
Severe bradycardia or high-grade AV block
Cardiogenic shock
Esmolol IV bolus and infusion
Initiate 500 mcg/kg bolus over 1 minute
Continue 50 mcg/kg/min infusion
Titrate 25-50 mcg/kg/min every 5-10 minutes
Preferred phenotypes
Aortic dissection adjunct
Perioperative sympathetic surge
Precautions
Bradycardia
Decompensated heart failure
Hydralazine IV
Initiate 5-10 mg IV
Repeat every 20-40 minutes as needed
Unpredictable response
Role limitations
Avoid as first-line for most emergencies
Reflex tachycardia risk
Enalaprilat IV
Initiate 0.625-1.25 mg IV
Repeat every 6 hours as needed
Maximum 5 mg per dose
Preferred phenotype
Heart failure with afterload excess when renal function acceptable
Contraindications
Pregnancy
Bilateral renal artery stenosis suspicion
Hyperkalemia
Condition-specific protocols
Aortic dissection management
Anti-impulse therapy sequence
Initiate beta-blocker first
Esmolol infusion pathway
HR target less than 60 beats/min
Add vasodilator after beta-blockade if needed
Nicardipine infusion pathway
SBP target less than 120 mmHg
Guideline alignment
Class I recommendation for rapid HR control and SBP lowering in acute aortic syndromes
Acute pulmonary edema management
Primary therapies
Nitroglycerin infusion pathway
Rapid titration for symptom relief
Noninvasive ventilation when appropriate
CPAP or BiPAP for work of breathing
Adjuncts
Loop diuretic if volume overloaded
Monitor electrolytes mmol/L
Acute coronary syndrome management
BP control adjunct
Nitroglycerin infusion pathway when ongoing pain or pulmonary edema
Avoided therapies
Nitroprusside in suspected coronary ischemia when alternatives available
Hypertensive encephalopathy or PRES
Preferred agents
Nicardipine infusion pathway
Gradual MAP reduction targets
Clevidipine infusion pathway
Tight titration with frequent neuro checks
Avoided patterns
Rapid overshoot hypotension
Sympathomimetic toxicity
First-line symptom control
Benzodiazepines for agitation and autonomic surge
Reduced catecholamine drive
If persistent hypertension
Phentolamine IV
Initiate 1-5 mg IV
Repeat every 5-15 minutes as needed
Nicardipine infusion pathway
Avoid beta-blocker monotherapy in acute cocaine toxicity
Preeclampsia or eclampsia
Antihypertensive options
Labetalol bolus pathway
SBP target less than 160 mmHg
Hydralazine IV pathway
Alternative if beta-blocker contraindicated
Nicardipine infusion pathway
ICU titration option when needed
Seizure prophylaxis and treatment
Magnesium sulfate
Initiate 4-6 g IV loading dose
Continue 1-2 g/hour infusion
Guideline alignment
Class I recommendation for magnesium sulfate in eclampsia prevention and treatment
Oral therapy for hypertensive urgency
Nonemergent BP management
Resume home antihypertensives when appropriate
Missed doses without contraindication
Oral options by context
Amlodipine
Typical onset hours
ACE inhibitor or ARB per baseline plan
Avoid in pregnancy
Beta-blocker continuation when indicated
Avoid abrupt withdrawal
Avoided agents
Immediate-release nifedipine for rapid lowering
Ischemia risk from precipitous drop
Special Populations
Pregnancy
Pregnancy-specific considerations
Severe-range BP definition
Systolic BP 160 mmHg or higher
Diastolic BP 110 mmHg or higher
Medication safety
Preferred agents
Labetalol
Hydralazine
Nicardipine
Avoided agents
ACE inhibitors
ARBs
Direct renin inhibitors
Nitroprusside when alternatives available
Obstetric emergencies
Eclampsia
Magnesium sulfate pathway
HELLP syndrome
Platelets and liver enzymes monitoring
Geriatric
Older adult considerations
Autoregulation shift
Higher risk of cerebral hypoperfusion with rapid lowering
Comorbidity burden
Aortic stenosis consideration
Heart failure vulnerability
Chronic kidney disease prevalence
Medication sensitivity
Lower starting doses for bolus agents
Closer bradycardia monitoring with beta-blockers
Pediatrics
Pediatric considerations
Definition approach
BP percentile thresholds by age, sex, height
Target-organ injury focus over absolute number
Common etiologies
Renal parenchymal disease
Coarctation of aorta
Endocrine causes
Medication dosing
Weight-based IV antihypertensives per pediatric protocol
ICU involvement early for titratable infusions
Background
Epidemiology
Population patterns
Hypertensive emergencies represent a minority of ED severe BP presentations
Most severe BP elevations lack acute target-organ injury
Common precipitant
Antihypertensive nonadherence
High-risk groups
Chronic kidney disease
Established cardiovascular disease
Pregnancy with hypertensive disorders
Pathophysiology
Mechanistic overview
Acute failure of autoregulation
Endothelial injury
Fibrinoid necrosis in severe cases
Target-organ injury pathways
Brain edema and microvascular leakage
Myocardial oxygen demand mismatch
Renal ischemia and glomerular injury
Malignant hypertension features
Microangiopathic hemolysis risk
Rapid renal function decline
Therapeutic Considerations
Why controlled reduction matters
Autoregulatory curve shift in chronic hypertension
Hypoperfusion risk with abrupt BP drop
Agent selection principles
Titratable IV agents for predictable effect
Short half-life agents when neurologic status unstable
Evidence framing
Treatment guided by syndrome-specific outcome data and expert consensus
Class I recommendations for certain phenotypes
Aortic dissection anti-impulse therapy
Eclampsia magnesium sulfate
Patient Discharge Instructions
copy discharge instructions
Discharge instructions
Diagnosis summary
Severe blood pressure without evidence of organ injury today
Medications
Take prescribed BP medicines exactly as directed
Do not stop clonidine or beta-blocker suddenly
Home monitoring
BP log twice daily for 7 days
Proper cuff size and seated rest 5 minutes before checks
Follow-up
Primary care or hypertension clinic within 72 hours to 7 days
Earlier follow-up if medication changes made today
Return to ED now for
Chest pain
Shortness of breath
Fainting
New weakness
New trouble speaking
New vision loss
Severe headache with confusion
Seizure
Decreased urination
Pregnancy with headache, vision changes, or abdominal pain
References
Clinical guidelines and consensus
Guideline sources
ACC and AHA guidance on hypertensive crises and acute BP management
Class recommendation framework for aortic syndromes and stroke BP targets
AHA and ASA acute ischemic stroke guidelines
Thrombolysis BP thresholds
AHA and ASA intracerebral hemorrhage guidelines
Early BP lowering strategies
ACOG guidance for hypertensive disorders of pregnancy
Severe-range BP thresholds and treatment targets
Evidence-based sources
Key evidence themes
Rapid titration IV calcium channel blockers for predictable BP control
ACEP Level B for ED use of titratable IV agents when target-organ injury present
Beta-blocker first strategy for dissection physiology
Class I recommendation for anti-impulse therapy
Magnesium sulfate for eclampsia prevention and treatment
Class I recommendation in obstetric guidelines
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.