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55-Year-Old Male | BP 200/140 mmHg | Dizziness
This presentation — markedly elevated BP with a symptom — is a hypertensive crisis until proven otherwise. The first priority is determining whether this is a hypertensive emergency or hypertensive urgency.
Step 1: Immediate Assessment — Is There End-Organ Damage?
A hypertensive emergency is defined by BP elevation plus acute end-organ damage. Perform a targeted history and exam now:
| System | Symptoms/Signs to Look For |
|---|
| Neurological | Headache, confusion, visual changes, seizures → Encephalopathy, intracranial hemorrhage, stroke |
| Cardiac | Chest pain, tearing/radiating pain → ACS, aortic dissection |
| Pulmonary | Dyspnea, orthopnea → Pulmonary edema, acute heart failure |
| Renal | Oliguria, hematuria, elevated creatinine → Acute kidney injury |
| Ophthalmic | Blurred vision → Papilledema, retinal hemorrhage |
"Hypertensive emergency can exist in patients with or without underlying chronic HTN." — Rosen's Emergency Medicine
Step 2: Classification
| Hypertensive Emergency | Hypertensive Urgency |
|---|
| BP | Markedly elevated (often ≥180/120) | Markedly elevated |
| End-organ damage | YES | No |
| Setting | ICU admission, IV agents | Outpatient, oral agents |
| BP reduction goal | Controlled, gradual IV lowering | Oral medications, hours to days |
This patient at 200/140 + dizziness must be worked up urgently. Dizziness alone may reflect hypertensive encephalopathy or posterior circulation compromise.
Step 3: Immediate Investigations
- ECG — LVH, ST changes, acute ischemia
- CBC, BMP/CMP — Creatinine, BUN, electrolytes (renal function)
- Urinalysis — Proteinuria, casts (nephropathy)
- Troponin — If chest pain or dyspnea present
- CT Head (non-contrast) — If altered sensorium, severe headache, focal neuro signs
- CXR — Pulmonary edema, widened mediastinum (aortic dissection)
- Fundoscopy — Papilledema, flame hemorrhages
Step 4: Treatment
If Hypertensive EMERGENCY (end-organ damage confirmed):
Admit to ICU. Use IV agents with short half-lives.
| Drug | Dose | Onset | Use When |
|---|
| Labetalol | IV 20 mg bolus, repeat q10 min up to 300 mg; or infusion 0.5–2 mg/min | 5–10 min | Most emergencies, pregnancy, adrenergic excess |
| Nicardipine | IV 5 mg/h → titrate up to 15 mg/h | 1–5 min | Encephalopathy, stroke, renal failure |
| Sodium Nitroprusside | 0.25–10 mcg/kg/min IV infusion | Seconds | Severe hypertension, aortic dissection |
| Nitroglycerin | IV infusion | 2–5 min | ACS, post-CABG, pulmonary edema (preferred over nitroprusside in renal/hepatic disease) |
| Esmolol | IV bolus + infusion | 1–2 min | Aortic dissection, tachycardia |
| Clevidipine | IV 1–2 mg/h, double q90s → up to 16 mg/h | 2–4 min | Rapid titration needed |
"In hypertensive emergency, control of acute or ongoing end-organ damage is more important than the absolute level of BP." — Washington Manual of Medical Therapeutics
BP reduction targets:
- First hour: Reduce mean arterial pressure (MAP) by no more than 20–25%
- 2–6 hours: Target ~160/100 mmHg
- 24–48 hours: Gradual normalization
- ⚠️ Avoid rapid drops — can precipitate stroke, MI, or acute kidney injury
Special scenarios:
| Scenario | Preferred Agent |
|---|
| Aortic dissection | Esmolol + nitroprusside (reduce to SBP <120 within 20 min) |
| Ischemic stroke | Cautious lowering only if BP >220/120; use nicardipine |
| ACS | Nitroglycerin + labetalol |
| Pulmonary edema | Nitroglycerin, clevidipine |
| Eclampsia/pregnancy | Labetalol, hydralazine, methyldopate |
| Encephalopathy | Nicardipine or labetalol |
| Pheochromocytoma | Phentolamine (alpha-blocker) |
If Hypertensive URGENCY (no end-organ damage):
- Oral agents — restart or intensify existing antihypertensives
- Captopril 25 mg PO, labetalol 200 mg PO, or amlodipine 5–10 mg PO
- Target BP reduction over 24–48 hours, not minutes
- Discharge with close follow-up in 24–72 hours
- Avoid sublingual nifedipine — causes unpredictable, precipitous drops → stroke/MI risk
Causes to Consider / Rule Out
- Non-adherence to antihypertensives (most common)
- Pain, anxiety, white coat effect
- Secondary HTN workup if indicated: renal artery stenosis, primary hyperaldosteronism, pheochromocytoma, obstructive sleep apnea, thyroid disease
- Drug interactions or substances (cocaine, amphetamines, NSAIDs, decongestants)
Summary Action Checklist
- ✅ Get IV access, continuous cardiac monitoring, pulse oximetry
- ✅ Focused neuro exam (level of consciousness, focal deficits)
- ✅ Labs: BMP, CBC, troponin, UA + micro
- ✅ ECG + CXR
- ✅ Fundoscopy if available
- ✅ CT head if any neuro symptoms
- ✅ Classify as emergency vs. urgency → guide treatment setting and agents
Sources: Goldman-Cecil Medicine; Rosen's Emergency Medicine; Washington Manual of Medical Therapeutics; Comprehensive Clinical Nephrology, 7th Ed. | Systematic review support: Benenson et al., High Blood Press Cardiovasc Prev, 2023 [PMID 37284909]; Siddiqi et al., JAHA 2023 [PMID 37421281]