Hypertensive Crisis
A blood pressure of 210/130 mmHg can mean two very different things — one requires IV medication in minutes, the other allows hours. Knowing which is which changes everything.
Core Concept
Hypertensive crisis is a BP reading above 180/120 mmHg, but the critical split is between urgency and emergency. In hypertensive urgency, BP is severely elevated but there is no evidence of acute end-organ damage. The client may have a headache or epistaxis, and BP is lowered gradually over 24–48 hours with oral medications (captopril, labetalol PO). In hypertensive emergency, the same BP is actively destroying target organs — brain (encephalopathy, stroke), heart (acute MI, pulmonary edema), kidneys (acute kidney injury), or eyes (papilledema, retinal hemorrhages). This demands ICU admission and IV antihypertensives such as nitroprusside, nicardipine, or labetalol IV. The goal is to reduce MAP by no more than 25% in the first hour. Dropping BP too fast causes watershed ischemia — the brain has autoregulated to high pressures, and a sudden drop starves it. Continuous arterial BP monitoring via an arterial line is standard. You assess neurological status frequently: changes in LOC, new focal deficits, or visual complaints signal worsening target-organ damage and must be reported immediately.
Watch Out For
Don't confuse urgency (no organ damage, oral meds, 24–48 hr reduction) with emergency (active organ damage, IV meds, ICU). Students often think the BP number alone determines the category — it doesn't; the presence or absence of end-organ damage does. Lowering BP too fast is as dangerous as the crisis itself; the 25% MAP rule in the first hour prevents iatrogenic stroke.
Clinical Pearl
Urgency = elevated number, no damage, oral meds, slow reduction. Emergency = organs screaming, IV drips, ICU, and never drop MAP more than 25% in the first hour.
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