Hypertension

Hypertension – CEN Emergency Nursing Review 🏥🩺

In the ED, hypertension is either a number (common and often not emergent) or a time-sensitive crisis causing organ injury.
CEN questions love testing whether you can separate asymptomatic elevated BP from hypertensive emergency and choose the correct priorities. 🎯🚑

Fast Jump 🧭

Why this matters •
Anatomy •
Physiology •
Pathophysiology •
ED presentation •
CEN pearls •
Assessment •
Interventions •
Diagnostics •
Complications •
Exam traps •
Rapid review

ED danger = BP + end-organ injury 🚨

• Hypertension can cause acute injury to the brain, heart, aorta, kidneys, and eyes. 🧠🫀🩸🫘👁️
• Hypertensive emergency requires rapid recognition and controlled BP reduction with IV meds (usually ICU-level). 🚑
• Most ED hypertension is asymptomatic elevated BP—treating the number aggressively can cause stroke, MI, syncope from hypoperfusion. ⚠️
• CEN questions test: Do you treat the BP, or the patient? ✅

How it commonly presents in triage 🧾

• Incidental: “Here for ankle pain” with BP 190/110 but no symptoms. 🦶
• Stress/pain/anxiety: elevated BP improves after analgesia, anxiolysis, rest, repeat measurement. 😖
• Emergency symptoms: chest pain, neuro deficits, severe dyspnea, severe headache/vision changes, altered mental status, pregnancy complications. 🚨

The “targets” hypertension injures 🧠🫀🩸🫘👁️

• Arteries/arterioles: high pressure damages endothelium → vasoconstriction, inflammation, thrombosis. 🩸
• Brain: small vessels → hemorrhage/ischemia; swelling → encephalopathy. 🧠
• Heart: coronary demand increases → ischemia/MI; LV hypertrophy → HF. 🫀
• Aorta: high shear stress → dissection risk. 🩸🧨
• Kidneys: glomerular injury → AKI. 🫘
• Eyes: retinal vessel damage → visual changes, papilledema (severe). 👁️

BP basics nurses must know ✅

• BP ≈ CO × SVR (cardiac output × systemic vascular resistance). 🫀🩸
• SVR rises with vasoconstriction (stress, pain, catecholamines, drugs). ⚡
• Autoregulation: brain/kidneys adapt to chronic high BP; dropping BP too fast can cause hypoperfusion. 🧠🫘
• MAP (mean arterial pressure) drives organ perfusion—CEN questions often focus on perfusion, not just systolic numbers. 🎯

Step-by-step: what goes wrong in hypertensive crisis 🧠

1. Trigger: missed meds, stimulant use (cocaine/amphetamines), renal failure, endocrine causes, pregnancy, pain/anxiety, withdrawal, or acute illness. 💊⚡
2. SVR spikes (vasoconstriction) → BP rises further. 🩸⬆️
3. Endothelial damage → leaky vessels, platelet activation, microthrombi. 🩸
4. Organ injury develops:
   • Brain: stroke/ICH/encephalopathy (confusion, seizures). 🧠
   • Heart: ACS, acute HF/flash edema. 🫀🫁
   • Aorta: dissection. 🧨
   • Kidneys: AKI. 🫘
   • Eyes: retinal hemorrhages/papilledema. 👁️

Hypertension “types” in the ED (CEN favorite) 🎯

What triage nurses might notice 🧾

• Neuro: weakness, slurred speech, confusion, seizure, “worst headache.” 🧠
• Cardiac: chest pressure, diaphoresis, new ischemic EKG changes. 🫀
• Resp: severe SOB, crackles, pink frothy sputum (flash edema). 🫁
• Aorta: ripping/tearing chest/back pain, pulse/BP differential, syncope. 🧨
• Pregnancy: headache, RUQ/epigastric pain, vision changes, edema, seizures. 🤰🚨

The “CEN decision point” ✅

• Repeat BP correctly: right cuff size, seated/rested, arm at heart level, recheck manually if needed. 🩺
• Don’t drop BP too fast in chronic HTN—risk cerebral/renal hypoperfusion. 🧠🫘
• Flash pulmonary edema + severe HTN: high yield for early NIV + IV vasodilator strategy per provider. 🫁📉
• Aortic dissection: goal is to reduce shear stress—control HR/BP rapidly per protocol (often beta-blockade first). 🧨
• Pregnancy (preeclampsia/eclampsia): seizure prevention/management and BP control are critical; magnesium is a key medication. 🤰💊

What to assess (history + exam + red flags) 🧾

Key history questions 🎯

• Baseline BP? Known HTN? Current meds and missed doses? 💊
• Symptoms of organ injury: chest pain, dyspnea, neuro changes, vision changes, decreased urine output. 🧠🫀🫁👁️🫘
• Drug exposure: cocaine/amphetamines, decongestants, MAOIs, steroids, withdrawal. ⚡
• Pregnancy status and gestational age; headache/RUQ pain/vision changes. 🤰

Focused exam 🩺

• Neuro assessment (FAST, pupils, mental status). 🧠
• Heart/lungs: ischemia signs, crackles/pulmonary edema. 🫀🫁
• Perfusion: skin temp, pulses; compare BP in both arms if dissection suspected. 🩸
• Fundoscopic/vision complaint cues (severe cases). 👁️

ED nursing priorities (do this first + why) 🏥

If asymptomatic elevated BP 🟢

• Recheck BP, address pain/anxiety, review home meds, ensure follow-up. 🧾
• Avoid rapid IV BP drops unless directed for a true emergency. ⚠️

If hypertensive emergency 🔴🚨

• Continuous cardiac monitoring, frequent BP checks (often q5–15 min per protocol), 2 IVs if unstable. ⚡🩺
• Prepare for IV antihypertensive infusion/bolus meds per provider; titrate carefully and reassess neuro status/perfusion. 💊
• Support ABCs: O2/NIV for pulmonary edema, treat dysrhythmias/ACS pathways as indicated. 🫁🫀
• Escalate early (ICU/CT/echo) based on suspected organ injury. 🚑

Tests depend on suspected organ injury 🎯

• EKG + troponin: ischemia/ACS, LVH strain. ⚡🧪
• CXR: pulmonary edema, widened mediastinum clues (dissection context). 🩻
• CMP: creatinine/electrolytes for renal injury and medication safety. 🫘🧪
• Urinalysis: protein/hematuria (renal involvement; pregnancy workup). 🧪
• Neuro imaging (CT head) if stroke/ICH symptoms. 🧠
• CT angiography if aortic dissection suspected. 🧨
• Pregnancy labs (per protocol): platelets, LFTs, urine protein, etc. 🤰
• POCUS: LV function, B-lines (edema), aortic root clues (context-dependent). 🔬

When BP causes damage (or treatment causes harm) 🚨

• Stroke/ICH, hypertensive encephalopathy, seizures. 🧠
• ACS/MI, acute HF/flash pulmonary edema. 🫀🫁
• Aortic dissection. 🧨
• AKI. 🫘
• Retinal hemorrhage/vision loss. 👁️
• Iatrogenic hypoperfusion if BP is lowered too quickly. ⚠️

Most common CEN mistakes 🎯

• Trap: Treating asymptomatic high BP with aggressive IV meds.
  Fix: Assess for end-organ damage first; recheck BP properly; address pain/anxiety; ensure follow-up. ✅
• Trap: Calling headache alone a hypertensive emergency.
  Fix: Look for objective neuro findings, AMS, papilledema, seizure, ICH signs. 🧠
• Trap: Missing aortic dissection.
  Fix: Sudden tearing pain + neuro deficits/pulse deficit/BP differential = emergency until proven otherwise. 🧨
• Trap: Dropping BP too fast in chronic HTN.
  Fix: Controlled reduction with frequent reassessment—protect cerebral/renal perfusion. 🧠🫘
• Trap: Missing pregnancy-related hypertensive crisis.
  Fix: Headache + vision changes + RUQ pain + pregnancy/postpartum = treat as high risk. 🤰🚨

One-minute HTN recap 🏥✅

• HTN emergency = BP + acute end-organ damage (brain, heart, aorta, kidneys, eyes). 🧠🫀🧨🫘👁️
• Most ED HTN is not emergent — confirm BP, treat pain/anxiety, review meds, arrange follow-up. 🩺
• Do NOT drop BP too fast in chronic HTN — risk hypoperfusion stroke/AKI. ⚠️
• Flash pulmonary edema + severe HTN = NIV + afterload reduction strategy per provider. 🫁📉
• Aortic dissection pattern: sudden tearing chest/back pain + pulse/BP differential → immediate escalation. 🧨
• Pregnancy red flags: headache/vision changes/RUQ pain/seizure → treat urgently. 🤰🚨

Study tip 🧠: On CEN questions, if BP is high, immediately ask: “Where is the organ injury?” If you can’t find it, the priority is usually repeat BP correctly + symptom control + safe disposition/follow-up — not IV drips. 🎯🏥

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