Internal Medicine · Year 3 · from Internal Medicine
Case 1: Hypertensive Emergency
Patient Presentation
A 52-year-old man with a history of poorly controlled hypertension presents with severe headache, blurred vision, and chest discomfort that started 4 hours ago. He ran out of his blood pressure medications 2 weeks ago and has not been taking them. He reports nausea and admits to recent cocaine use approximately 8 hours ago.
Vital Signs
- Blood Pressure: 228/134 mmHg (confirmed in both arms)
- Heart Rate: 102 bpm
- Respiratory Rate: 22/min
- Oxygen Saturation: 95% on room air
- Temperature: 37.3°C
Physical Examination
- General: Anxious, diaphoretic
- HEENT: Papilledema on fundoscopic exam, AV nicking
- Cardiovascular: S4 gallop, no murmurs
- Pulmonary: Bibasilar crackles
- Neurologic: Alert and oriented, no focal deficits
- Extremities: Trace bilateral edema
Initial Workup
- ECG: Sinus tachycardia, left ventricular hypertrophy with strain pattern
- Troponin I: 0.12 ng/mL (mildly elevated)
- BNP: 680 pg/mL
- Creatinine: 2.1 mg/dL (baseline 1.2)
- Urinalysis: 2+ protein, occasional RBC casts
- Chest X-ray: Cardiomegaly, pulmonary vascular congestion
- CT Head: No hemorrhage
Clinical Image
Figure 1: Grade IV hypertensive retinopathy with papilledema, flame hemorrhages, and cotton wool spots indicating malignant hypertension.
Image Source: Educational illustration for teaching purposes.
Questions
- What distinguishes a hypertensive emergency from hypertensive urgency?
- A) Blood pressure level above 180/120 mmHg
- B) Presence of acute target organ damage
- C) Duration of elevated blood pressure
- D) Patient symptoms
- Which target organs are affected in this patient?
- A) Eyes only
- B) Eyes, heart, and kidneys
- C) Brain and heart only
- D) Kidneys only
- What is the appropriate blood pressure reduction goal in the first hour?
- A) Reduce to normal (<120/80) immediately
- B) Reduce mean arterial pressure by no more than 25%
- C) Reduce to <140/90 mmHg
- D) Reduce systolic by 50 mmHg
- Which intravenous antihypertensive would be most appropriate for initial management?
- Why should beta-blockers be avoided or used cautiously in this patient?
Answers
- B) Presence of acute target organ damage - Hypertensive emergency is defined by severely elevated BP WITH acute target organ damage (encephalopathy, AKI, heart failure, aortic dissection, retinopathy). Hypertensive urgency is severely elevated BP WITHOUT acute organ damage.
- B) Eyes, heart, and kidneys - This patient has papilledema (eyes), elevated troponin and pulmonary edema (heart), and acute kidney injury with proteinuria and RBC casts (kidneys). Multiple organs are affected.
- B) Reduce mean arterial pressure by no more than 25% - Rapid BP reduction risks hypoperfusion of vital organs adapted to high pressures. Goal is to reduce MAP by no more than 25% in the first hour, then gradually to 160/100-110 over the next 2-6 hours.
- Appropriate IV antihypertensives:
- Nicardipine (calcium channel blocker): First-line, titratable, no reflex tachycardia at clinical doses
- Labetalol (combined alpha/beta blocker): Good option but use cautiously given recent cocaine
- Clevidipine: Ultra-short acting CCB
- Nitroprusside: Alternative but requires monitoring for cyanide toxicity
- Avoid hydralazine (unpredictable response) and sublingual nifedipine (precipitous BP drop)
- Beta-blocker caution with cocaine:
- Recent cocaine use causes sympathetic surge with both alpha and beta receptor stimulation
- Beta-blocker monotherapy leads to unopposed alpha-stimulation
- This can worsen coronary vasoconstriction and hypertension
- If beta-blockade is needed, use combined alpha/beta blocker (labetalol) or benzodiazepines first
- Benzodiazepines help control cocaine-induced sympathetic excess