# Aortic Dissection

Aortic dissection requires rapid anatomic diagnosis, immediate anti-impulse therapy, and disposition determined by ascending-aortic involvement, rupture, malperfusion, and persistent symptoms. Computed tomographic angiography is first-line in most stable patients; type A disease requires emergency surgical evaluation, whereas uncomplicated type B disease begins with medical therapy.

**Clinical question:** How should physicians rapidly diagnose, stabilize, classify, treat, and surveil patients with acute aortic dissection?

Updated: 2026-08-20T23:44:02.416673Z

## What matters in practice
- Obtain urgent CTA for suspected acute aortic syndrome; TEE or MRI are reasonable alternatives when CTA is unsuitable. A low aortic-dissection risk score plus D-dimer <500 ng/mL can help exclude acute aortic syndrome only in low-pretest-probability patients. [6]
- Initial treatment is ICU-level anti-impulse therapy with an arterial line, IV beta blockade unless contraindicated, target heart rate 60 to 80 beats/min, and systolic pressure <120 mm Hg or the lowest pressure preserving end-organ perfusion. [6]
- Acute type A dissection warrants immediate surgical consultation and operative repair; stable transfer to a high-volume aortic center is reasonable when it does not compromise timely care. [6]
- Uncomplicated acute type B dissection is initially managed medically. Rupture, malperfusion, extension, progressive enlargement, refractory pain, or uncontrolled hypertension requires intervention; TEVAR is preferred over open repair when anatomy is suitable. [6]
- After acute dissection or intramural hematoma, obtain CT or MRI at 1, 6, and 12 months, then annually if stable; residual chronic thoracic aortic disease reaching 5.5 cm warrants elective repair. [6]

## Recognize high-risk presentations and obtain definitive imaging

Do not rely on chest radiography, ECG, or biomarkers alone to exclude acute aortic syndrome.

Acute aortic syndrome should be considered with abrupt severe chest, back, or abdominal pain, especially with pulse deficit, limb blood-pressure differential, neurologic deficit, new aortic regurgitation murmur, syncope, hypotension, known thoracic aortic disease, recent aortic manipulation, or heritable aortopathy. Measure blood pressure in both arms and lower extremities and assess for coronary, cerebral, visceral, renal, spinal, and limb malperfusion. [6]

CTA is the recommended initial diagnostic study because it is rapid, widely available, and delineates the dissection extent, entry tear when visible, branch-vessel involvement, malperfusion, hemopericardium, mediastinal hemorrhage, and pleural effusion. For suspected acute aortic syndrome, obtain noncontrast images first when feasible to identify intramural hematoma, followed by arterial-phase CTA from the thoracic inlet through the femoral arteries. ECG-gated acquisition improves assessment of the root and ascending aorta. [6]

TEE is a useful bedside alternative in unstable patients or when iodinated contrast is unsuitable; it also defines aortic regurgitation, pericardial effusion, and true-versus-false lumen flow. MRI is highly accurate but is generally reserved for stable patients when CT is contraindicated or uncertainty persists because acquisition and monitoring are less practical in unstable patients. [6]
- Use the Aortic Dissection Detection Risk Score: one point each for high-risk condition, pain feature, and examination feature; 0 is low risk, 1 intermediate risk, and 2 to 3 high risk. [6]
- In low-pretest-probability presentations, D-dimer <500 ng/mL plus a low risk score may help exclude acute aortic syndrome; it is not a stand-alone exclusion test in higher-risk presentations. [6]
- A chest radiograph may show mediastinal widening, abnormal aortic contour, or a calcium sign, but lacks sufficient sensitivity and specificity to rule out disease. [6]

*Immediate diagnostic strategy for suspected acute aortic syndrome. [6]*

| Clinical context | Preferred next test | Actionable result |
| --- | --- | --- |
| Hemodynamically stable; acute aortic syndrome suspected | CTA with noncontrast and arterial-phase imaging | Define type A versus type B involvement, branch-vessel compromise, rupture, and operative/endovascular anatomy. [6] |
| Too unstable for CT transfer or iodinated contrast unsuitable | TEE | Assess proximal dissection, aortic regurgitation, tamponade, and proximal false-lumen anatomy; involve aortic surgery urgently if type A is identified. [6] |
| Stable patient with contraindication to iodinated contrast or unresolved diagnostic uncertainty | MRI | Use when acquisition and monitoring are feasible; do not delay urgent management of probable type A disease. [6] |

## Classify anatomy and initiate anti-impulse therapy before definitive repair

Stabilization and surgical/endovascular consultation proceed in parallel with imaging.

Stanford type A includes any dissection involving the ascending aorta; type B spares the ascending aorta. The current SVS/STS temporal classification defines hyperacute disease as <24 hours, acute as 1 to 14 days, subacute as 15 to 90 days, and chronic as >90 days after symptom onset. [6]

All acute aortic syndromes require prompt ICU care with invasive arterial pressure monitoring and anti-impulse therapy. Begin an IV beta blocker unless contraindicated; the guideline identifies esmolol, metoprolol, and labetalol as commonly used agents. If beta blockade is contraindicated or not tolerated, IV verapamil or diltiazem is a reasonable alternative for heart-rate control. The supplied sources support targets but do not provide regimen-specific dosing; use institutional protocols and product labeling. [6]

After heart-rate control, add an IV vasodilator if blood pressure remains above goal; commonly used agents include nicardipine, clevidipine, and sodium nitroprusside. Avoid initiating a vasodilator before rate control because reflex tachycardia can increase aortic wall stress. Treat pain, generally with IV opioids, because pain-driven sympathetic activation impairs hemodynamic control. [6]
- Target heart rate: 60 to 80 beats/min. [6]
- Target systolic blood pressure: <120 mm Hg or the lowest pressure that preserves end-organ perfusion. [6]
- Use particular caution with beta blockers in acute severe aortic regurgitation, heart block, or bradycardia. [6]

*Anti-impulse therapy sequence in acute aortic syndrome. [6]*

| Step | Intervention | Purpose and caution |
| --- | --- | --- |
| 1 | ICU admission and arterial line | Continuous hemodynamic monitoring while definitive treatment is arranged. [6] |
| 2 | IV beta blocker; IV diltiazem or verapamil if beta blockade is unsuitable | Reduce heart rate and dP/dt before vasodilation. [6] |
| 3 | IV vasodilator if pressure remains uncontrolled after rate control | Lower systolic pressure; do not use first because compensatory tachycardia may occur. [6] |
| 4 | Analgesia and serial malperfusion assessment | Reduce sympathetic activation and identify evolving coronary, neurologic, visceral, renal, spinal, or limb ischemia. [6] |

## Treat acute type A dissection as a surgical emergency

The principal immediate threat is rupture, tamponade, acute regurgitation, coronary compromise, or malperfusion.

Acute type A dissection requires emergency surgical consultation and immediate operative intervention because medical management alone carries substantially higher mortality. In IRAD, medical mortality was 57% compared with 18% surgical mortality in contemporary cohorts; untreated symptomatic ascending dissection has early mortality of approximately 1% to 2% per hour after symptom onset. [6]

If the patient is stable enough for transfer, management at a high-volume aortic center is reasonable. High-volume multidisciplinary teams have lower mortality, and guideline-supported aortic centers integrate cardiac surgery, vascular/endovascular expertise, advanced imaging, anesthesiology, and critical care. [6]

Neurologic injury alone should not reflexively preclude surgery. In patients with nonhemorrhagic stroke complicating type A dissection, surgery is reasonable over medical therapy; reported mortality with surgical versus medical treatment was approximately 25% to 27% versus 76%. Complete internal carotid occlusion with cerebral edema risk is a particularly poor-prognosis subgroup requiring individualized multidisciplinary assessment. [6]
- For renal, lower-extremity, or uncomplicated visceral malperfusion, proceed with immediate central aortic repair and reassess residual malperfusion afterward. [6]
- Clinically significant mesenteric malperfusion is a major exception with genuine management variation: either immediate central repair or expert endovascular/open mesenteric reperfusion before central repair is reasonable. [6]
- If tamponade causes critical shock while awaiting surgery, controlled drainage of very small amounts of hemopericardium may temporize selected patients, but definitive treatment remains immediate aortic repair; rapid aggressive pericardiocentesis may worsen bleeding. [23]

*Operative principles for acute type A dissection. [6]*

| Finding or operative issue | Preferred approach | Rationale |
| --- | --- | --- |
| Partially dissected root without major leaflet pathology | Aortic valve resuspension rather than valve replacement | Preserves the native valve with acceptable durability. [6] |
| Root destruction, root aneurysm, or known genetic aortopathy | Root replacement with mechanical or biologic valved conduit | Reduces risk from persistent root disease. [6] |
| No arch entry tear or major arch aneurysm | Hemiarch rather than total arch replacement | More extensive arch repair has higher operative risk without consistent late reoperation benefit. [6] |
| Distal repair | Open distal anastomosis | Associated with better survival and greater false-lumen thrombosis than clamp-on distal techniques. [6] |
| Cannulation when feasible | Axillary rather than femoral cannulation | Reduces stroke or retrograde malperfusion risk. [6] |

## Use medical therapy first for uncomplicated acute type B dissection

Intervene for rupture, malperfusion, progression, refractory symptoms, or high-risk anatomy.

Initial management of uncomplicated acute type B dissection is medical anti-impulse therapy. This remains the guideline-recommended strategy despite substantial late risk of aneurysmal degeneration, because prophylactic TEVAR has remodeling benefits but uncertain universal early clinical benefit. [6]

Complicated acute type B dissection requires urgent intervention. Complications include rupture, branch-vessel occlusion or malperfusion, dissection extension, progressive enlargement, intractable pain, and uncontrolled hypertension. With suitable anatomy, TEVAR is recommended for rupture and is reasonable over open repair for other complications. Persistent static malperfusion may require adjunctive fenestration or branch-vessel stenting after TEVAR. [6]

In selected uncomplicated patients with high-risk imaging features, TEVAR may be considered. These features include maximal aortic diameter >40 mm, false-lumen diameter >20 to 22 mm, entry tear >10 mm, entry tear on the lesser curvature, interval total-aortic-diameter increase >5 mm, bloody pleural effusion, or imaging-only malperfusion. Refractory hypertension despite more than three maximally tolerated antihypertensive classes, persistent pain >12 hours despite maximal therapy, and readmission are additional high-risk clinical features. [6]
- Discuss prophylactic TEVAR as an individualized decision, not default care, balancing aortic remodeling against procedural stroke, spinal cord ischemia, retrograde type A dissection, endoleak, reintervention, anatomy, age, and life expectancy. [6][9]
- For TEVAR requiring planned left subclavian coverage, revascularize the left subclavian artery before TEVAR to reduce spinal cord injury and potentially stroke; this is especially important with a patent left internal mammary graft or left-arm dialysis access. [6]
- Patients with Marfan syndrome, Loeys-Dietz syndrome, or vascular Ehlers-Danlos syndrome generally favor open repair for intact descending thoracic aneurysm when intervention is required, because endovascular durability is less established in native connective-tissue aorta. [6]

*Acute type B dissection: disposition by complication status. [6]*

| Status | Management | Key triggers |
| --- | --- | --- |
| Uncomplicated | Medical therapy initially | No rupture, malperfusion, extension, progressive enlargement, refractory pain, or uncontrolled hypertension. [6] |
| Complicated with rupture | Urgent TEVAR if suitable anatomy | Free or contained rupture, hemothorax, increasing periaortic/mediastinal hematoma. [6] |
| Complicated with malperfusion or other progression | TEVAR preferred when anatomy is suitable; add branch-vessel interventions if needed | Visceral, renal, spinal, or limb ischemia; extension; aortic enlargement; refractory pain or hypertension. [6] |
| Uncomplicated but high risk | Consider TEVAR in selected patients | Aortic diameter >40 mm, false lumen >20 to 22 mm, entry tear >10 mm, interval enlargement, bloody effusion, or imaging-only malperfusion. [6] |

## Maintain lifelong blood-pressure control, surveillance, and family assessment

Survival after the index event does not eliminate risk from residual dissection or distal aneurysm formation.

Long-term therapy after acute aortic syndrome should include beta blockers unless contraindicated; add ACE inhibitors or ARBs as needed to control blood pressure. Long-term calcium-channel blocker therapy may be best avoided in Marfan syndrome when alternatives can achieve blood-pressure control because adverse signals have been reported in experimental and registry data. [6]

For dissection or intramural hematoma managed medically or treated with open or endovascular repair with residual disease, perform CT or MRI at 1, 6, and 12 months and then annually if stable. TTE complements cross-sectional imaging by following root anatomy and aortic valve function. [6]

Screen first-degree relatives of patients with aortic root or ascending aortic aneurysm or aortic dissection with aortic imaging. Obtain a multigenerational history of thoracic aortic disease, unexplained sudden death, and peripheral or intracranial aneurysms. Genetic testing is recommended when risk factors for heritable thoracic aortic disease are present, including syndromic features, age <60 years, or relevant family history. [6]
- Use reproducible orthogonal measurements at defined landmarks; report the technique and compare directly with prior studies. [6]
- For CT/MRI, use ECG-gated inner-edge-to-inner-edge root and ascending measurements; use outer-edge measurements for segments with wall thickening, intramural hematoma, or significant atherosclerotic wall abnormality. [6]
- Advise against intense isometric exertion, Valsalva-associated heavy lifting, burst exertion, and collision sports; with controlled blood pressure, mild-to-moderate aerobic activity for 30 to 60 minutes at least 3 to 4 days weekly is reasonable. [6]

*Surveillance after acute dissection or intramural hematoma. [6]*

| Clinical state | Imaging schedule | Management consequence |
| --- | --- | --- |
| Residual disease after open or endovascular repair | CT or MRI at 1, 6, and 12 months; annually if stable | Identify false-lumen enlargement, endoleak, graft complication, or new aneurysm requiring reintervention. [6] |
| Medical management alone | CT or MRI at 1, 6, and 12 months; annually if stable | Detect delayed expansion, which occurs in 20% to 50% of medically managed uncomplicated type B dissections over 4 years. [6] |
| Chronic residual thoracic aortic aneurysm | Elective repair at total diameter ≥5.5 cm | Threshold applies after prior acute dissection or intramural hematoma. [6] |

## Common questions

### What is the first-line imaging study for suspected acute aortic dissection?

CTA is first-line in most patients because of speed, availability, and complete anatomic assessment. TEE is useful at bedside in unstable patients; MRI is best reserved for stable patients when CTA is unsuitable. [6]

### What hemodynamic targets should be used initially in acute aortic dissection?

Treat to heart rate 60 to 80 beats/min and systolic pressure <120 mm Hg, or the lowest pressure that preserves end-organ perfusion. Start IV beta blockade before adding vasodilators. [6]

### When is TEVAR indicated in type B aortic dissection?

TEVAR is indicated for rupture and is preferred when anatomy is suitable for complicated type B dissection with malperfusion, extension, enlargement, refractory pain, or uncontrolled hypertension. Selected uncomplicated patients with high-risk anatomy may also be considered. [6]

### Should first-degree relatives undergo screening after aortic dissection?

Yes. First-degree relatives of patients with aortic root or ascending aneurysm or aortic dissection should receive screening aortic imaging, even if no pathogenic genetic variant is identified. [6]

## References
1. Zenith® Dissection - accessdata.fda.gov — www.accessdata.fda.gov — https://www.accessdata.fda.gov/cdrh_docs/pdf18/P180001C.pdf
2. ENDOVASCULAR TREATMENT OF THE THORACIC AORTA — www.accessdata.fda.gov — https://www.accessdata.fda.gov/cdrh_docs/pdf21/P210032D.pdf
3. Acute aortic dissection — www.thelancet.com — https://www.thelancet.com/article/S0140673622019705/pdf
4. The Diagnosis and Management of Aortic Dissection — jamanetwork.com — https://jamanetwork.com/journals/jama/fullarticle/383986
5. Interval or Permanent Nonoperative Management of Acute ... — jamanetwork.com — https://jamanetwork.com/journals/jamasurgery/fullarticle/390261
6. 2022 ACC/AHA Guideline for the Diagnosis and Management of Aortic Disease: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines — www.jacc.org — https://www.jacc.org/doi/10.1016/j.jacc.2022.08.004
7. 2022 Aortic Disease Guideline-at-a-Glance — www.jacc.org — https://www.jacc.org/doi/10.1016/j.jacc.2022.10.001
8. Thoracic Aortic Aneurysm and Dissection — www.jacc.org — https://www.jacc.org/doi/10.1016/j.jacc.2014.08.025
9. Optimal Treatment of Uncomplicated Type B Aortic Dissection: JACC Review Topic of the Week — www.jacc.org — https://www.jacc.org/doi/10.1016/j.jacc.2019.07.063
10. Aortic Dissection | Circulation — www.ahajournals.org — https://www.ahajournals.org/doi/10.1161/circulationaha.108.799908
11. Diagnosis of Acute Aortic Dissection by D-Dimer | Circulation — www.ahajournals.org — https://www.ahajournals.org/doi/10.1161/circulationaha.108.833004
12. Aortic Dissection: New Frontiers in Diagnosis and ... — www.ahajournals.org — https://www.ahajournals.org/doi/10.1161/01.cir.0000087009.16755.e4
13. Acute Aortic Dissection | Circulation — www.ahajournals.org — https://www.ahajournals.org/doi/10.1161/circulationaha.110.958975
14. Clinical Examination for Acute Aortic Dissection: A ... — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/10.1111/acem.13360
15. 2014 ESC Guidelines on the diagnosis and treatment of aortic ... — academic.oup.com — https://academic.oup.com/eurheartj/article/35/41/2873/407693
16. Diagnosing aortic dissection: A review of this elusive, lethal ... — onlinelibrary.wiley.com — https://onlinelibrary.wiley.com/doi/full/10.1002/emp2.13225
17. The incidence and mortality of acute thoracic aortic dissection — academic.oup.com — https://academic.oup.com/ejcts/article/50/6/1111/2726579
18. 2024 ESC Guidelines for the management of peripheral ... — academic.oup.com — https://academic.oup.com/eurheartj/article/45/36/3538/7738955
19. Surgical management for Stanford type A aortic dissection ... — academic.oup.com — https://academic.oup.com/icvts/article/7/6/1107/655538
20. American Society for Clinical Pharmacology and Therapeutics — ascpt.onlinelibrary.wiley.com — https://ascpt.onlinelibrary.wiley.com/doi/10.1002/cpt.3167
21. 2022 ACC/AHA Guideline for the Diagnosis and ... — www.ccjm.org — https://www.ccjm.org/lookup/external-ref?access_num=10.1161%2FCIR.0000000000001106&link_type=DOI
22. Thoracic aortic aneurysm: Optimal surveillance and treatment — www.ccjm.org — https://www.ccjm.org/content/87/9/557
23. Cardiac tamponade due to aortic dissection: clinical picture and treatment with focus on pericardiocentesis — www.escardio.org — https://www.escardio.org/communities/councils/cardiology-practice/scientific-documents-and-publications/ejournal/volume-15/Cardiac-tamponade-due-to-aortic-dissection-clinical-picture-and-treatment-with-focus-on-pericardiocentesis
24. Aortic valve diseases in pregnancy — www.escardio.org — https://www.escardio.org/communities/councils/cardiology-practice/scientific-documents-and-publications/ejournal/volume-18/aortic-valve-diseases-in-pregnancy

## Editorial note

Prepared from cited clinical literature using Astra's research workflow. Verify recommendations against current guidance and patient-specific factors.