Aortic dissection
Stem
A 54-year-old man, 96 kg, arrives with sudden tearing chest pain radiating to his back. CT angiography shows a Stanford type A dissection from the aortic root to the iliac bifurcation. BP is 176/94 in the right arm and 138/78 in the left, and heart rate is 104. Bedside echo shows moderate aortic regurgitation, a small pericardial effusion without tamponade, and normal ventricular function. He is going to the OR for emergency repair.
Question
How will you manage him from the time he arrives in the OR until he goes on bypass?
Ideal answer
HeadlineType A dissection: onto bypass fast, low wall stress, no collapse. IV beta-blocker first, usually esmolol, to heart rate 60–80; only then nicardipine to systolic below 120.1
- Beta-blocker, then vasodilator, with analgesia, because pain drives both rate and pressure.1
- Right radial arterial line, since the higher right-arm pressure suggests left subclavian involvement; femoral line if axillary cannulation is planned.
- Large-bore access, blood in the room, because rupture bleeds fast; cerebral oximetry and nasopharyngeal temperature ready for circulatory arrest.2
- Induce prepped and draped, surgeon scrubbed, because of the effusion, so we can open the chest at once if pressure falls; controlled induction blunting laryngoscopy without dropping pressure, vasopressor ready.
- Gentle TEE: flap, aortic regurgitation, effusion, coronaries, ventricles; then plan circulatory arrest with antegrade cerebral perfusion and the target temperature.2
Breaking down the answer
- Anti-impulse order — the guideline puts IV beta-blockers first; a vasodilator alone causes reflex tachycardia and increases shear on the flap.1 Changes if: driven too low, systolic pressure malperfuses brain, gut or kidneys.
- Speed matters — contemporary IRAD data show mortality of 0.5% per hour in medically managed type A dissection (23.7% at 48 hours), versus 4.4% at 48 hours surgically.3
- Type A goes to surgery — immediate operative repair is recommended; uncomplicated type B is managed medically first.1
- The root is the danger zone — retrograde extension causes aortic regurgitation, coronary obstruction and pericardial effusion.4 Each changes induction, so TEE confirms them before bypass.
- Line placement is a judgment test — the arterial line must read during cannulation and cerebral perfusion, never only in the arm with the deficit.
- Brain protection — moderate hypothermia with antegrade cerebral perfusion, because deep hypothermia adds coagulopathy and organ dysfunction without better neurologic outcomes.2 Cell salvage belongs in the setup.
Follow-up question
After induction and intubation his pressure falls to 64/40 and his heart rate rises to 128. TEE shows the effusion has enlarged, with diastolic collapse of the right atrium and right ventricle. What do you do?
Follow-up answer
HeadlineTamponade from rupture into the pericardium, worsened by induction and positive pressure. I tell the surgeon to open the chest now.
I ask perfusion to be ready for emergency cannulation. During the sternotomy I give volume and a vasopressor, keep his heart rate up, reduce tidal volume and PEEP to protect venous return, and start transfusion. I avoid overshooting once the pericardium opens, because the sudden release can cause hypertension and extend the tear. After decompression I reassess aortic regurgitation and ventricular function on TEE, then return to anti-impulse targets until bypass.1
Pitfalls that cost points
- Starting a vasodilator before rate control.
- Putting the only arterial line in the arm with a pressure deficit.
Rapid-fire
Q: What separates Stanford A from B? A: Type A involves the ascending aorta; type B involves only the descending aorta.4
Q: What blood pressure target do you set for chronic dissection? A: Below 140/90 mmHg, with long-term beta-blockade.4
Q: When does an acute type B dissection need intervention? A: For rupture, malperfusion, extension, rapid enlargement, intractable pain or uncontrolled hypertension.1
Q: How long does bilateral antegrade cerebral perfusion allow? A: About 86 to more than 164 minutes with low cerebral risk, compared with 30 to 50 minutes for unilateral perfusion.2
Numbers to know
| Item | Value |
|---|---|
| Systolic target, acute | <120 mmHg1 |
| Heart rate target | 60–80 bpm1 |
| Untreated type A mortality | 0.5%/h; 23.7% at 48 h3 |
| Surgical group 48-h mortality | 4.4%3 |
| Chronic BP target | <140/90 mmHg4 |
Links
- Cardiac tamponade, including post-cardiac surgery, Cardiopulmonary bypass: conduct and separation, Massive hemorrhage and transfusion, Abdominal aortic aneurysm and the cross-clamp
- Atlas: The 11 TEE views; Atrial septal defect and aortic dissection
- 2022 ACC/AHA Guideline for the Diagnosis and Management of Aortic Disease
Sources
- 1.2022 ACC/AHA Aortic Disease Guideline Key Perspectives: Part 2 of 2 · ACC/AHA, 2022 · acc.org
- 2.2024 EACTS/EACTAIC/EBCP Guidelines on cardiopulmonary bypass in adult cardiac surgery · EACTS/EACTAIC/EBCP, 2024 · ebi.ac.ukSection on brain protection during hypothermic circulatory arrest and antegrade cerebral perfusion.
- 3.Early Mortality in Type A Acute Aortic Dissection: Insights From the International Registry of Acute Aortic Dissection · JAMA Cardiology (IRAD), 2022 · ebi.ac.uk
- 4.Review on Acute Aortic Dissection: Key Points · ACC, 2023 · acc.orgSummary of Rylski, Schilling and Czerny, Eur Heart J 2022.
Facts on this page were checked against these sources on Oct 15, 2026. Guidelines change; confirm doses against current institutional protocols.