RN Nursing · Hypertension · Practice question
A client is being treated for a Hypertensive Emergency. The nurse knows the goal is to lower the Mean Arterial Pressure (MAP) by no more than:
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50% in the first hour
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✓
25% within the first hour
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10% every 15 minutes
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To 120/80 mmHg immediately
Answer & explanation
Correct: 25% within the first hour
In a hypertensive emergency — defined as severely elevated blood pressure (typically above 180/120 mmHg) with evidence of acute target-organ damage — overly rapid reduction of blood pressure is dangerous. Organs that have adapted to chronically elevated pressures depend on higher perfusion pressures to maintain adequate blood flow; a sudden drop can precipitate ischemia of the brain, heart, or kidneys. Current guidelines recommend reducing the mean arterial pressure by no more than 25% within the first hour of treatment, then gradually normalizing pressure over the next 24 to 48 hours. Reducing by 50% in the first hour would be far too aggressive and could cause a cerebrovascular accident or renal infarction. Reducing by 10% every 15 minutes is also excessively rapid. Targeting an immediate normalization to 120/80 mmHg is contraindicated for the same reasons — the autoregulatory threshold would be crossed too quickly. The 25% rule in the first hour is the standard teaching point for hypertensive emergency management on both NCLEX and HESI exams and reflects the principle that controlled, gradual reduction protects end-organ perfusion while still addressing the dangerous pressure elevation.
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