Aortic Emergencies
2
Stanford Types
Type A = ascending (surgery) Type B = descending (medical)
100-120
Target SBP
mmHg for dissection management
<60
Target HR
Beats per minute
Dissection Classification
Stanford is the system the exam usesType A
Involves the Ascending Aorta
- Requires EMERGENT surgical repair
- Risk of coronary occlusion, tamponade, aortic regurgitation
- Higher mortality without surgery
- Can extend retrograde or antegrade
Type B
Descending Aorta Only
- Medical management (BP and HR control)
- Surgery only if complicated (malperfusion, rupture, refractory pain)
- Endovascular repair (TEVAR) for complicated Type B
- Better prognosis with medical management
Classic presentation includes sudden, severe, tearing chest or back pain. CT angiography is the gold standard for diagnosis. Transesophageal echo (TEE) can be used at bedside if the patient is too unstable.
Management Priorities
Beta-blockers BEFORE vasodilators. Nitroprusside alone increases aortic shear stress. The sequence matters because vasodilators cause reflex tachycardia, which forces more blood against the damaged wall with each rapid beat.
IV beta-blocker first (esmolol or labetalol) to target HR <60 bpm
Add vasodilator (nitroprusside or nicardipine) if SBP still >120 after HR controlled
Target SBP 100-120 mmHg AND HR <60 bpm simultaneously
Pain control (morphine or fentanyl) which also helps reduce sympathetic drive
Type A → emergent surgical consult. Type B → ICU monitoring and continued medical management
Key Values to Memorize
SBP target 100-120 mmHg
HR target <60 bpm
Beta-blocker FIRST
CTA = gold standard
BP differential >20 mmHg = red flag
Type A = always surgery
you know the pathophysiology, now prove it under pressure
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Practice CCRN QuestionsExam Traps
Beta-blockers BEFORE vasodilators, always
Giving a vasodilator like nitroprusside first causes reflex tachycardia, which increases aortic shear stress and worsens the dissection. Start esmolol or labetalol first to control heart rate, THEN add vasodilators if SBP is still elevated.
Type A is a surgical emergency
Ascending aortic dissection (Type A) can extend into the coronary arteries, cause tamponade, or rupture into the pericardium. It requires emergent surgical repair. Medical management alone carries extremely high mortality.
BP differential greater than 20 mmHg between arms is a red flag
A significant difference in blood pressure between the right and left arms suggests the dissection flap is occluding flow to one subclavian artery. This finding should immediately raise suspicion for aortic dissection.
Drug Order Matters
NEVER give nitroprusside alone in aortic dissection. It causes reflex tachycardia that worsens the tear. Beta-blocker FIRST.
A vs B Management
Type A (ascending) = rush to surgery. Type B (descending) = medical management unless complicated.
Picture a garden hose with three layers. A dissection starts when the innermost layer tears, letting high-pressure water force its way between the layers, creating a false channel.
The faster and harder the water pumps, the more it extends the tear. That is why controlling blood pressure AND heart rate is the absolute first priority. You need to reduce the force hitting the tear.
If the tear is near the faucet (ascending aorta, Type A), it threatens the supply to the entire house. Emergency plumber (surgeon) needed. If it is further down the line (descending, Type B), you can often manage by just turning down the water pressure.
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