15.3 Aortic Emergencies
Key Takeaways
- Stanford Type A involves the ascending aorta and is a cardiac-surgery emergency; Type B is descending-only and is medical unless complicated.
- Dissection is an intimal tear and false lumen; aneurysm rupture is full-thickness hemorrhage—both can present as tearing pain, but the shock and destination logic differ.
- Pulse deficit, stroke or paraplegia, tamponade, and acute aortic regurgitation mark malperfusion or Type A rupture into the sac.
- Anti-impulse therapy lowers heart rate with a beta-blocker first, then adds a vasodilator; never open with nitroprusside.
- Do not fly a Type A to a PCI-only hospital if a cardiac-surgery center is reachable; treat pain, and do not confuse this with Chapter 12 traumatic shear.
Aortic emergencies are new scored content on the August 2026 outline. Domain 4.B.4 of the Board of Certification for Emergency Nursing (BCEN) Certified Flight Registered Nurse (CFRN) exam now lists dissection and aneurysm as medical great-vessel crises you must recognize, quiet, and route. This is not Chapter 12 traumatic aortic injury (TAI). TAI is sudden-deceleration shear at the ligamentum arteriosum. Medical dissection is an intimal tear in a hypertensive, connective-tissue, bicuspid, or aneurysmal aorta. Anti-impulse overlaps; mechanism and destination do not.
Type A versus Type B, dissection versus rupture
The Stanford system is the one you will use on the radio. Type A involves the ascending aorta, whether or not the arch and descending aorta are also torn. Type B starts distal to the left subclavian and spares the ascending aorta. Sending notes may still use DeBakey I/II/III (ascending-plus-descending, ascending-only, descending-only). Type A is a cardiac-surgery emergency because the tear can wreck the aortic valve, the coronaries, and the pericardium. Uncomplicated Type B is a blood-pressure and intensive-care unit (ICU) disease. Complicated Type B—rupture, refractory pain or hypertension, or malperfusion—needs thoracic endovascular aortic repair (TEVAR) or open repair.
Aneurysm rupture is not the same hole
An aneurysm is pathologic dilation of all wall layers. Rupture is full-thickness failure: blood leaves the vessel into the chest, peritoneum, or retroperitoneum. The patient is often hypotensive and dying of hemorrhage. A dissection is an intimal tear that splits a false lumen down the media. Many dissection patients are still hypertensive on the ramp. The tearing pain can look identical; the tank is not. A ruptured abdominal aortic aneurysm (AAA) needs blood, a program permissive-hypotension conversation, and a vascular operating room or interventional suite. Anti-impulse therapy into a ruptured, empty aneurysm loses the only remaining pressure. A hypertensive dissection needs a quiet pulse, not four uncrossmatched units first.
The picture you cannot auscultate at 3,000 feet
Sudden tearing or ripping chest or interscapular pain is the classic story. Believe migratory pain that walks to the back or abdomen. Then hunt complications you can still find in a helmet:
- Pulse deficit or a blood pressure (BP) differential, often taught as 20 mm Hg or more between arms—measure both and treat the higher number.
- Neurologic malperfusion: stroke if the carotids or innominate are involved, or paraplegia if spinal radiculars are sheared.
- Cardiac tamponade when Type A ruptures into the pericardium: hypotension, jugular venous distention (JVD), a narrow pulse pressure (Chapter 9).
- Acute aortic regurgitation (AR) from Type A: wide pulse pressure if not yet shocked, flash edema, and a pump filling backward.
A 12-lead may show inferior ischemia if the right coronary ostium is involved. That is still an aortic case, not a reason to divert to a percutaneous coronary intervention (PCI)-only laboratory. Pain control is therapy. Fentanyl or another titratable opioid drops catecholamines and shear; do not withhold analgesia to “watch the exam.”
| Lesion | Core problem | Flight priority |
|---|---|---|
| Stanford Type A | Ascending tear; valve, coronaries, sac | Anti-impulse if hypertensive; cardiac surgery |
| Uncomplicated Type B | Descending false lumen, organs perfused | Rate then pressure; aortic-capable ICU |
| Complicated Type B | Malperfusion, rupture, refractory pain or BP | TEVAR- or open-capable center |
| Aneurysm rupture | Full-thickness bleed | Blood and surgical or endovascular control |
| Traumatic aortic injury (Ch 12) | Deceleration shear at the isthmus | Same anti-impulse idea; trauma hybrid OR |
Anti-impulse therapy, targets, and the wrong hospital
Anti-impulse therapy lowers the rate of pressure rise (dP/dt) so the false lumen stops ripping. Start a short-acting intravenous (IV) beta-blocker first—esmolol is the usual titratable choice; labetalol or metoprolol appear in many protocols. Drop the heart rate (HR) before you drop the pressure. Then add a vasodilator (nicardipine, clevidipine, or nitroprusside) if systolic blood pressure (SBP) stays high. Never open with nitroprusside: reflex tachycardia increases shear and extends the tear. If the patient is already hypotensive from tamponade or rupture, this is volume, blood, and a surgeon—not a drip experiment.
SBP and HR targets are program and American Heart Association (AHA)-style teaching, not BCEN cutoffs. The 2022 AHA / American College of Cardiology (ACC) aortic-disease guideline discusses systolic pressure under 120 mm Hg, or the lowest pressure that still perfuses organs, and a heart rate of 60–80. Many flight protocols still aim for a quieter pulse near 60 and a systolic of 100–120. Use your program numbers. Watch mentation and urine.
Destination: a surgeon, not a balloon pump hospital
Type A goes to cardiac surgery—a hospital that can put the patient on cardiopulmonary bypass and repair the ascending aorta. Do not fly Type A to a PCI-only hospital if a surgical aortic center is reachable. A catheterization laboratory can stent a coronary; it cannot reconstruct an ascending aorta at 02:00. Uncomplicated Type B can go to an ICU that already owns arterial-line drips and an aortic consult. Complicated Type B needs TEVAR. Hand off the two arm pressures, the neurologic exam, tamponade signs, and the drips.
Do not relabel a highway deceleration chest as medical dissection that can wait for Monday computed tomography (CT). That patient is Chapter 12 TAI and belongs in a trauma hybrid room.
- Name the Stanford type from the sending scan or the complications you can still see.
- Separate hypertensive dissection from hypotensive aneurysm rupture before you pick a drip or blood.
- Beta-block the rate, then vasodilate; never nitroprusside first.
- Control pain; it is shear control, not courtesy.
- Fly Type A to cardiac surgery, not a PCI-only laboratory, when a surgical center is in range.
A hypertensive patient with sudden tearing chest pain has a sending computed-tomography report of a Type A dissection. A PCI-only hospital is twelve minutes away; a cardiac-surgery aortic center is twenty-eight minutes away. Where do you fly?
You are starting anti-impulse therapy for a still-hypertensive Type B dissection. What is the correct drug order?
Which statement correctly separates medical aortic disease from Chapter 12 trauma?