Hypertensive Emergency

A 62-year-old man with long-standing uncontrolled hypertension presents to the emergency department with severe headache, confusion, chest discomfort, and shortness of breath. Blood pressure is 230/140 mm Hg. Examination reveals papilledema and bilateral pulmonary crackles. Serum creatinine is elevated. ECG shows left ventricular hypertrophy. Diagnosis?

Diagnosis is Hypertensive Emergency.

This patient has severe hypertension with clear acute hypertension-mediated organ damage, including severe hypertensive retinopathy with papilledema and neurologic dysfunction consistent with probable hypertensive encephalopathy.

His dyspnea and bilateral pulmonary crackles strongly suggest acute hypertensive pulmonary edema or acute heart failure.

The elevated creatinine indicates renal dysfunction, but a single elevated value cannot establish acute kidney injury without comparison with baseline renal function.

ECG evidence of left ventricular hypertrophy represents chronic hypertension-mediated organ damage, not acute organ injury.

The combination of extreme hypertension, papilledema, neurologic dysfunction, and renal dysfunction is also consistent with the malignant hypertension phenotype.

1. Definition

Hypertensive emergency is severe blood pressure elevation associated with new or worsening acute target-organ damage, requiring immediate evaluation and controlled blood pressure reduction.

Severe hypertension is commonly defined as:

1.      SBP >180 mm Hg

2.      DBP >120 mm Hg

However:

Acute target-organ damage, rather than the absolute blood pressure value alone, defines hypertensive emergency.

Hypertensive emergencies may occur at lower blood pressures when the rise is abrupt, particularly in:

1.      Pregnancy-related hypertension

2.      Acute glomerulonephritis

3.      Catecholamine excess states

4.      Previously normotensive individuals

2. Hypertensive Emergency

Hypertensive emergency generally requires:

1.      Immediate assessment

2.      Admission to an intensive care or closely monitored setting

3.      Usually intravenous, rapidly titratable antihypertensive therapy

4.      Frequent or continuous blood pressure monitoring

5.      Treatment directed at the specific acute organ injury

The affected organ determines the preferred drug, speed of blood pressure reduction, and blood pressure target.

3. Pathophysiology

1.      Severe blood pressure elevation exceeds normal vascular autoregulatory capacity

2.      Endothelial injury and microvascular dysfunction develop

3.      Vasoconstriction, increased vascular permeability, and tissue ischemia occur

4.      Severe microvascular injury may produce fibrinoid necrosis

5.      Cerebral autoregulatory failure may produce vasogenic cerebral edema

6.      Progressive cerebral, cardiac, renal, retinal, or vascular injury develops

Potential consequences include:

1.      Hypertensive encephalopathy

2.      Cerebral edema

3.      Myocardial ischemia

4.      Acute heart failure and pulmonary edema

5.      Acute deterioration in renal function

6.      Hypertensive retinopathy

7.      Thrombotic microangiopathy

Hypertensive encephalopathy may be associated with posterior reversible encephalopathy syndrome (PRES).

4. Acute Target-Organ Damage

4.1 Neurologic

1.      Hypertensive encephalopathy

2.      Ischemic stroke

3.      Intracerebral hemorrhage

4.      Seizures

5.      Altered mental status

6.      Visual disturbance

7.      PRES

4.2 Cardiac

1.      Acute coronary syndrome

2.      Acute heart failure

3.      Acute cardiogenic pulmonary edema

4.      Myocardial ischemia

4.3 Vascular

1.      Acute aortic syndrome, including aortic dissection

4.4 Renal

1.      Acute deterioration in renal function

2.      Acute kidney injury when confirmed by a rise from baseline or other accepted diagnostic criteria

3.      Hematuria

4.      Proteinuria

5.      Severe hypertension may produce thrombotic microangiopathy

6.      Microangiopathic hemolytic anemia and thrombocytopenia may occur

4.5 Ophthalmologic

1.      Retinal hemorrhages

2.      Cotton-wool spots

3.      Papilledema

Papilledema indicates severe hypertensive retinal injury but is not required for the diagnosis of hypertensive emergency.

5. Malignant Hypertension

Malignant hypertension is a hypertensive emergency characterized by severe blood pressure elevation with acute hypertensive microvascular injury, classically involving the retina, kidneys, and brain.

Findings may include:

1.      Retinal hemorrhages

2.      Cotton-wool spots

3.      Papilledema

4.      Acute deterioration in renal function

5.      Thrombotic microangiopathy

6.      Hypertensive encephalopathy

7.      Acute heart failure

This patient's papilledema, neurologic dysfunction, and renal dysfunction strongly support this phenotype.

6. Clinical Features

Presentation depends on the affected organ.

Common features include:

1.      Severe headache

2.      Confusion or altered mental status

3.      Chest pain or discomfort

4.      Dyspnea

5.      Visual disturbance

6.      Focal neurologic deficits

7.      Seizures

8.      Oliguria

9.      Pulmonary crackles when acute pulmonary edema is present

7. Severe Hypertension Without Acute Target-Organ Damage

Severe blood pressure elevation may occur without new or worsening acute target-organ damage.

These patients do not have a hypertensive emergency.

The older term hypertensive urgency is increasingly replaced by terms such as severe hypertension or asymptomatic markedly elevated blood pressure, depending on the guideline and clinical setting.

Patients may have nonspecific symptoms such as:

1.      Mild headache

2.      Anxiety

3.      Epistaxis

The defining feature is:

No new or worsening acute target-organ damage

Rapid intravenous blood pressure reduction is generally not indicated.

8. Diagnostic Evaluation

8.1 Initial Assessment

1.      Confirm blood pressure using an appropriate cuff and correct measurement technique

2.      Repeat measurement when clinically appropriate

3.      Assess immediately for acute target-organ damage

4.      Perform a focused neurologic examination

5.      Assess for acute heart failure and myocardial ischemia

6.      Assess renal function and urine output

7.      Perform funduscopic examination when feasible

8.      Evaluate for acute aortic syndrome when clinically suspected

In a patient with an obvious hypertensive emergency, treatment should not be delayed merely to obtain repeated resting blood pressure measurements.

8.2 Laboratory Evaluation

Testing should be guided by the suspected organ injury and commonly includes:

1.      CBC

2.      Serum electrolytes

3.      Serum creatinine and eGFR

4.      Urinalysis

5.      Cardiac troponin when myocardial ischemia is suspected

6.      Peripheral blood smear, LDH, haptoglobin, and platelet count when thrombotic microangiopathy or microangiopathic hemolysis is suspected

8.3 Cardiac and Imaging Evaluation

Depending on the presentation:

1.      ECG

2.      Chest X-ray

3.      Bedside echocardiography or lung ultrasound when acute cardiac dysfunction or pulmonary edema is suspected

4.      CT brain for acute neurologic symptoms or altered mental status when intracranial pathology must be excluded

5.      CT angiography when acute aortic syndrome is suspected

6.      Additional imaging according to the affected organ

9. Management of Hypertensive Emergency

9.1 Initial Management

1.      Admit to an intensive care or closely monitored setting

2.      Establish frequent or continuous blood pressure monitoring

3.      Use a rapidly titratable intravenous antihypertensive agent in most hypertensive emergencies

4.      Identify and treat the specific acute target-organ injury

5.      Avoid uncontrolled or excessive blood pressure reduction

9.2 Common Intravenous Antihypertensive Agents

Choice depends on the affected organ and clinical situation.

1.      Nicardipine

2.      Clevidipine

3.      Labetalol

4.      Esmolol

5.      Nitroglycerin

6.      Sodium nitroprusside in selected circumstances

Nicardipine and clevidipine are useful titratable arterial vasodilators.

Labetalol is useful in many hypertensive emergencies but should generally be avoided in active acute decompensated heart failure or cardiogenic pulmonary edema.

Nitroglycerin is particularly useful when severe hypertension is accompanied by acute coronary ischemia or hypertensive cardiogenic pulmonary edema.

Nitroprusside is used selectively because of risks including cyanide and thiocyanate toxicity, particularly with prolonged administration or significant renal or hepatic dysfunction.

10. Blood Pressure Reduction Strategy

10.1 Core Principle

Blood pressure reduction in hypertensive emergency should be organ-specific.

The affected target organ determines:

1.      The speed of blood pressure reduction

2.      The magnitude of blood pressure reduction

3.      The preferred antihypertensive agent

4.      The appropriate blood pressure target

Excessively rapid or uncontrolled reduction may cause:

1.      Cerebral ischemia

2.      Myocardial ischemia

3.      Renal ischemia

Immediate normalization of blood pressure is usually inappropriate unless a specific condition requires very rapid reduction.

10.2 General Target Without a Compelling Condition

For hypertensive emergency without a condition requiring a different blood pressure target:

1.      Reduce SBP by no more than approximately 25% during the first hour

2.      If clinically stable, reduce blood pressure to approximately <160/100 to 110 mm Hg over the next 2 to 6 hours

3.      Continue gradual reduction toward normal blood pressure over the following 24 to 48 hours

This general strategy does not apply universally.

Acute aortic syndrome, ischemic stroke, intracerebral hemorrhage, acute coronary syndrome, pulmonary edema, pregnancy-related hypertensive emergencies, and other specific conditions require individualized targets and treatment strategies.

11. Important Exceptions

11.1 Acute Aortic Syndrome

Rapid anti-impulse therapy is required.

1.      Target SBP <120 mm Hg, or the lowest blood pressure that maintains adequate end-organ perfusion

2.      Target heart rate approximately 60 to 80/min

3.      Begin an intravenous beta blocker, such as esmolol or labetalol, unless contraindicated

4.      Add an intravenous vasodilator if additional blood pressure reduction is required

A vasodilator should generally not precede beta blockade, because reflex tachycardia can increase aortic wall stress.

11.2 Acute Ischemic Stroke

Blood pressure management depends on reperfusion therapy and associated clinical conditions.

Patients receiving intravenous thrombolysis:

1.      Lower blood pressure to <185/110 mm Hg before intravenous thrombolysis

2.      During the first 24 hours after thrombolysis, maintain SBP approximately 140 to 180 mm Hg and DBP ≤105 mm Hg

3.      Do not target SBP <140 mm Hg, because intensive reduction below this level does not improve functional outcomes

Patients undergoing endovascular thrombectomy:

1.      A preprocedural blood pressure of <185/110 mm Hg is a reasonable target based on major thrombectomy trials

2.      After successful recanalization, intensive lowering of SBP to <140 mm Hg is not recommended and may be harmful

Patients not receiving reperfusion therapy:

1.      If BP is <220/120 mm Hg and there is no other condition requiring urgent BP reduction, active blood pressure lowering during the first 48 to 72 hours does not improve death or dependency

2.      If BP is ≥220/120 mm Hg, individualized blood pressure reduction is generally recommended

3.      An initial blood pressure reduction of approximately 15% is generally appropriate while balancing cerebral and systemic organ perfusion

4.      Other emergencies such as acute aortic syndrome or acute heart failure may require more urgent blood pressure reduction despite the ischemic stroke

Avoid excessive lowering that could compromise cerebral perfusion.

11.3 Intracerebral Hemorrhage

For patients with mild to moderate spontaneous intracerebral hemorrhage presenting with SBP 150 to 220 mm Hg:

1.      Target SBP approximately 140 mm Hg

2.      Maintain SBP approximately 130 to 150 mm Hg

3.      Avoid lowering SBP to <130 mm Hg, which may be harmful

4.      Aim for smooth, sustained blood pressure control with minimal variability

5.      Begin treatment promptly when appropriate

Blood pressure targets should be individualized in patients with:

1.      Large or severe intracerebral hemorrhage

2.      Elevated intracranial pressure

3.      Compromised cerebral perfusion

4.      Need for surgical intervention

11.4 Acute Cardiogenic Pulmonary Edema

1.      Rapid but controlled blood pressure reduction is appropriate

2.      Intravenous nitroglycerin is particularly useful in hypertensive pulmonary edema

3.      Provide oxygen when hypoxemic

4.      Use noninvasive positive-pressure ventilation when clinically indicated

5.      Use loop diuretics when clinically significant congestion or volume overload is present

6.      Avoid initiating beta blockers during active acute decompensated heart failure or pulmonary edema

In this patient, dyspnea and bilateral crackles make acute hypertensive pulmonary edema highly likely, although imaging or bedside ultrasonography can further support the diagnosis.

12. Severe Hypertension Without Acute Organ Damage

In patients with severe blood pressure elevation but no new or worsening acute target-organ injury:

1.      Do not routinely use intravenous antihypertensive therapy

2.      Avoid rapid or large blood pressure reductions

3.      Confirm accurate blood pressure measurement

4.      Address reversible contributors such as pain, anxiety, missed medication, or withdrawal states

5.      Reinstitute or appropriately intensify chronic oral antihypertensive therapy

6.      Arrange timely outpatient reassessment and follow-up

For hospitalized patients with asymptomatic severe hypertension, routine intermittent intravenous treatment or aggressive acute oral blood pressure lowering may cause harm and should generally be avoided.

13. Prognosis and Follow-Up

1.      Hypertensive emergency is associated with substantial short-term and long-term cardiovascular risk

2.      Prognosis depends on the type and severity of acute organ injury

3.      After stabilization, evaluate for contributing factors and secondary hypertension when appropriate

4.      Establish durable long-term blood pressure control

5.      Address medication adherence and cardiovascular risk factors

6.      Arrange close follow-up after discharge

14. Key Clinical Insight

Severe hypertension + new or worsening acute target-organ damage = hypertensive emergency.

Severe hypertension without acute target-organ damage does not require rapid intravenous blood pressure reduction.

In this patient:

BP 230/140 mm Hg + confusion + papilledema + probable acute hypertensive pulmonary edema = hypertensive emergency with acute multisystem involvement.

The elevated creatinine indicates renal dysfunction and may represent acute kidney injury if increased from baseline, while ECG-detected LVH reflects chronic hypertension-mediated cardiac damage.

References

1.      Jones DW, Ferdinand KC, Taler SJ, et al. 2025 AHA/ACC/AANP/AAPA/ABC/ACCP/ACPM/AGS/AMA/ASPC/NMA/PCNA/SGIM Guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. Circulation. 2025;152(11):e114-e218. doi:10.1161/CIR.0000000000001356.

2.      Prabhakaran S, Gonzalez NR, Zachrison KS, et al. 2026 Guideline for the Early Management of Patients With Acute Ischemic Stroke: A Guideline From the American Heart Association/American Stroke Association. Stroke. 2026;57:e316-e436. doi:10.1161/STR.0000000000000513.

3.      Greenberg SM, Ziai WC, Cordonnier C, et al. 2022 Guideline for the Management of Patients With Spontaneous Intracerebral Hemorrhage: A Guideline From the American Heart Association/American Stroke Association. Stroke. 2022;53:e282-e361. doi:10.1161/STR.0000000000000407.