First-Line Treatment for Type B Aortic Dissection

Initial Management

• Medical therapy including pain relief and blood pressure control is the first-line treatment for all patients with acute type B aortic dissection (TBAD), as recommended by the European Society of Cardiology 1, 2
• Pain control should be initiated to achieve hemodynamic targets, with the goal of reducing aortic wall stress 1
• Blood pressure control with target systolic BP <120 mmHg and heart rate <60 bpm is recommended to reduce aortic wall stress, according to the European Heart Journal 3, 4
• Beta-blockers should be considered as first-line antihypertensive therapy, with options including esmolol, metoprolol, or labetalol, as suggested by the European Society of Cardiology 2, 3

Assessment for Complications

• Evaluate for signs of complicated TBAD, including aortic rupture/tamponade 5, cerebral malperfusion/stroke 6, mesenteric malperfusion 7, lower extremity malperfusion 6, refractory pain despite medical therapy 2, and rapidly expanding aortic diameter 7

Treatment Based on Presentation

• For uncomplicated type B aortic dissection, continue medical therapy with close surveillance, with follow-up imaging at 1, 3, 6, and 12 months after onset, then yearly if stable, as recommended by the European Society of Cardiology 2, 7, 8
• Consider TEVAR in the subacute phase for patients with high-risk features, such as primary entry tear >10 mm, initial aortic diameter >40 mm, initial false lumen diameter >20 mm, or partial false lumen thrombosis, as suggested by the European Heart Journal 2, 5, 8
• For complicated type B aortic dissection, emergency intervention is recommended, with TEVAR as the first-line therapy, according to the European Society of Cardiology 1, 2

Long-term Management

• Lifelong antihypertensive therapy is recommended for all patients, with the goal of preventing aortic expansion and reducing the risk of complications, as recommended by the European Society of Cardiology 2
• For chronic TBAD with descending thoracic aortic diameter ≥60 mm, intervention is recommended in patients at reasonable surgical risk, as suggested by the European Heart Journal 2
• For pregnant patients with TBAD, strict control of the pregnant patient and fetus with conservative medical management is recommended, according to the European Society of Cardiology 9

Management of Type B Aortic Dissection

Medical Management and Intervention

• The European Society of Cardiology recommends considering TEVAR between 14 and 90 days for selected patients with high-risk anatomical features to prevent late aortic complications 10
• For chronic type B dissection (>90 days) with descending thoracic aortic diameter ≥60 mm, intervention is recommended in patients at reasonable surgical risk 10
• Consider intervention at ≥55 mm in low procedural risk patients 10

Surveillance and Follow-up

• Follow-up imaging is recommended at 1, 3, 6, and 12 months after onset, and then yearly if imaging findings remain stable 10
• MRI is preferred for follow-up, though CT is acceptable particularly in patients >60 years, to monitor for false lumen expansion, aneurysm formation, new tears, or development of malperfusion 10

ESC Guideline Recommendations for Type B Aortic Dissection Management

Immediate Medical Management

• Initiate mandatory medical therapy—including analgesia and strict blood‑pressure control—to all patients with type B aortic dissection, irrespective of eventual endovascular treatment. [11][12]
• Admit patients to an intensive‑care unit with continuous three‑lead ECG monitoring and an arterial line for hemodynamic surveillance. 12
• Provide adequate pain control to facilitate achievement of target hemodynamic parameters. 12

Indications for Emergency TEVAR (Complicated Acute Dissection)

• Perform TEVAR emergently as first‑line therapy for complicated acute type B dissection. [11][12][13][14]
• Define “complicated” dissection by the presence of mal‑perfusion of visceral, renal, or lower‑extremity territories. 15
• Anticipate a 30‑day mortality of approximately 8 % after emergency TEVAR, with concurrent stroke and spinal‑cord ischemia rates of 8 % and 2 % respectively. 16

Subacute TEVAR Considerations (14–90 days)

• In uncomplicated acute type B dissection that exhibits high‑risk anatomical features, schedule TEVAR in the subacute window (14–90 days) to reduce late aortic complications. [13][17]
• High‑risk anatomical criteria include:
  
  • Primary entry tear larger than 10 mm. 13
  • Entry tear located on the inner curvature of the aorta. 13
• The INSTEAD‑XL randomized trial demonstrated that, at 5 years, TEVAR lowered aorta‑related mortality (6.9 % vs 19.3 %; p = 0.04) and disease progression (27.0 % vs 46.1 %; p = 0.04) compared with medical therapy alone, while overall mortality remained similar. [16][15]18

Long‑Term Medical Management and Surveillance (Uncomplicated Acute Dissection)

• Continue exclusive medical therapy with close imaging surveillance when no high‑risk features are present. [16][15]18
• Follow‑up imaging schedule: at 1, 3, 6, 12 months after onset, then annually if the aorta remains stable. [11][12]14
• Employ contrast‑enhanced CT or MRI for surveillance; MRI is preferred to limit radiation exposure. [16][15]18

Chronic Dissection Intervention Criteria (>90 days)

• Recommend endovascular or surgical intervention when the descending thoracic aortic diameter reaches ≥ 60 mm in patients with acceptable surgical risk. [11][12][13][14]17
• Consider earlier intervention at ≥ 55 mm for patients deemed low‑risk for the procedure. [13][17]
• Perform urgent intervention for acute manifestations such as mal‑perfusion, rupture, or rapid disease progression. [11][12]14
• Maintain lifelong antihypertensive therapy for all individuals with chronic type B dissection. [11][14]

Situations Favoring Open Surgical Repair Over TEVAR

• Opt for open surgery when endovascular access is compromised by:
  
  • Severe lower‑extremity arterial disease,
  • Marked iliac‑artery tortuosity,
  • Sharp angulation of the aortic arch, or
  • Lack of an adequate proximal landing zone for a stent‑graft. [16][18]

Post‑TEVAR Surveillance

• Conduct postoperative imaging at 1, 6, and 12 months, then annually through the fifth postoperative year to detect complications such as endoleak. [11][12]14