Definitions & Epidemiology
This condition is defined by BP >180/120 mm Hg with evidence of acute target organ damage.
What is a hypertensive emergency?
This loss explains why rapid BP reduction can cause cerebral, coronary, or renal hypoperfusion in chronic hypertension.
What is loss of autoregulation?
This BP difference between arms raises concern for acute aortic pathology.
What is a difference greater than 20 mm Hg?
This is the general initial MAP reduction goal for most hypertensive emergencies.
What is no more than 25% within the first hour?
These agents are preferred for their rapid titratability in hypertensive emergencies.
What are continuous infusion IV antihypertensives?
This key feature distinguishes severe hypertension from hypertensive emergencies.
What is acute hypertension‑related target organ damage?
This phenomenon explains why sodium excretion increases only at the expense of higher arterial pressure.
What is pressure natriuresis?
These fundoscopic findings indicate acute hypertensive microangiopathy.
What are retinal hemorrhages, cotton‑wool spots, and papilledema?
This hypertensive emergency uniquely requires more aggressive BP lowering (>25% MAP reduction).
What is acute aortic dissection?
This calcium channel blocker is commonly preferred due to reliable titration and minimal reflex tachycardia.
What is nicardipine?
This percentage reflects the approximate 1‑year cardiovascular morbidity and mortality after a hypertensive emergency.
What is 20–30%?
This vascular abnormality contributes to endothelial dysfunction and progressive hypertension.
What is increased peripheral arteriolar resistance?
This clinical finding differentiates hypertensive encephalopathy from focal ischemic stroke.
What is global (diffuse) neurological dysfunction?
In acute spontaneous ICH, this SBP range is targeted when presenting SBP is 150–220 mm Hg.
What is 130 to <140 mm Hg?
This medication is contraindicated in cocaine‑induced hypertensive emergencies.
What are beta blockers?
This organ system involvement is the least common initial presentation of hypertensive emergencies.
What is aortic dissection?
This system’s excessive activation promotes vasoconstriction, sodium retention, and BP elevation.
What is the renin–angiotensin–aldosterone system (RAAS)?
This imaging modality is preferred when PRES is suspected.
What is MRI of the brain?
Lowering SBP below this threshold in acute ICH is associated with harm.
What is 130 mm Hg?
This class must precede vasodilators when treating acute aortic dissection.
What are beta‑blockers?
Despite extremely elevated BP, patients without this finding should not receive immediate IV antihypertensive therapy.
What is acute target organ damage?
This explains why patients with impaired sodium excretion require higher BP levels to maintain sodium balance.
What is reduced renal natriuretic capacity?
These hematologic findings may mimic TTP but are attributed to severe hypertension.
What are schistocytes, thrombocytopenia, and elevated LDH from hypertensive microangiopathy?
This BP target must be achieved before administering IV thrombolytics in ischemic stroke.
What is <185/110 mm Hg?
This agent improves renal blood flow and is useful in hypertensive emergencies with AKI.
What is fenoldopam?