Hypertensive Emergency Management

Definition and Diagnosis

A hypertensive emergency is defined as a severely high blood pressure (often >180/120 mmHg) with acute hypertensive end-organ damage, requiring immediate blood pressure reduction, according to the European Heart Journal 1
The diagnosis is based not only on the absolute blood pressure value but also on the presence of acute end-organ damage, as stated by the Journal of the American College of Cardiology 3
Patients without acute hypertensive end-organ damage do not have a hypertensive emergency and can be treated with oral blood pressure-lowering agents, as recommended by the European Heart Journal 1

Heart: acute pulmonary edema, coronary ischemia/acute myocardial infarction, heart failure, as described by the European Heart Journal 4
Retina: advanced hypertensive retinopathy (grade III-IV) with bilateral flame-shaped hemorrhages, cotton-wool spots, and papilledema, as reported by the European Heart Journal 4
Brain: hypertensive encephalopathy, acute stroke (ischemic or hemorrhagic), as stated by the European Heart Journal 4
Kidneys: acute kidney failure, thrombotic microangiopathy (TMA), as described by the European Heart Journal 4
Large arteries: acute aortic disease (aneurysm or dissection), as reported by the European Heart Journal 4

Patients with hypertensive emergencies should be admitted to the hospital for close monitoring and treated with intravenous blood pressure-lowering medications to achieve the recommended target blood pressure within a specified time frame, as recommended by the European Heart Journal 1
The speed and extent of blood pressure reduction, as well as the type of blood pressure-lowering medication, depend heavily on the clinical context, as stated by the European Heart Journal 4
In patients without compelling indications, the systolic blood pressure should be reduced by no more than 25% in the first hour; then, if stable, to 160/100 mmHg within the next 2-6 hours; and then cautiously to normal values within the next 24-48 hours, as recommended by the Journal of the American College of Cardiology 3

Labetalol or Nicardipine are the most commonly used medications for most hypertensive emergencies and should be available in the emergency department or intensive care unit, as reported by the European Heart Journal 4
Nitroglycerin is particularly useful in patients with coronary ischemia or acute pulmonary edema, as stated by the European Heart Journal 4 and Hypertension 5

Malignant Hypertension with/without TMA or Acute Kidney Failure: initial therapy with Labetalol, as recommended by the European Heart Journal 4
Hypertensive Encephalopathy: initial therapy with Labetalol, as recommended by the European Heart Journal 4
Acute Ischemic Stroke with BP >220 mmHg systolic or >120 mmHg diastolic: initial therapy with Labetalol, as recommended by the European Heart Journal 4
Acute Hemorrhagic Stroke with systolic BP >180 mmHg: initial therapy with Labetalol, as recommended by the European Heart Journal 4
Acute Coronary Syndrome: initial therapy with Nitroglycerin, as reported by Hypertension 5
Acute Cardiogenic Pulmonary Edema: initial therapy with Nitroprussid or Nitroglycerin, as recommended by the European Heart Journal 4
Acute Aortic Disease: initial therapy with Esmolol and Nitroprussid or Nitroglycerin, as reported by Hypertension 5

Nicardipine: start with 5 mg/h, increase by 2.5 mg/h every 5 minutes to a maximum of 15 mg/h, as recommended by the Journal of the American College of Cardiology 3
Nitroprussid: start with 0.3-0.5 µg/kg/min, increase in steps of 0.5 µg/kg/min, maximum dose 10 µg/kg/min, treatment duration as short as possible, as stated by the Journal of the American College of Cardiology 3
Labetalol: initial 20 mg IV over 2 minutes, then 20-80 mg every 10 minutes up to a total dose of 300 mg, as recommended by Hypertension 5

Excessive blood pressure reductions that can lead to renal, cerebral, or coronary ischemia should be avoided, as stated by Hypertension 5
Short-acting Nifedipine is no longer acceptable for the initial treatment of hypertensive emergencies or urgencies, as reported by Hypertension 5
In patients with malignant hypertension, the activation of the renin-angiotensin system is highly variable, making the blood pressure-lowering response to renin-angiotensin system blockers unpredictable, as described by the European Heart Journal 4
Large blood pressure reductions (more than 50% decrease in mean arterial pressure) have been associated with ischemic stroke and death, as reported by the European Heart Journal 4