Management of Aortic Dissection

Initial Assessment and Stabilization

• The American College of Cardiology recommends establishing invasive monitoring with arterial line and continuous ECG recording for accurate blood pressure management 1
• Administer intravenous beta-blockers as first-line therapy to target systolic blood pressure <120 mmHg and heart rate ≤60 beats per minute 1
• If beta-blockers are contraindicated, use non-dihydropyridine calcium channel blockers for heart rate control 1
• For severe hypertension despite beta-blockade, add sodium nitroprusside to further reduce blood pressure 1
• Provide pain relief with morphine sulfate and transfer to intensive care unit for appropriate monitoring 1

Type-Specific Management

• Emergency surgical intervention is required to prevent aortic rupture, pericardial tamponade, and relieve aortic regurgitation in Type A dissections, according to the European Society of Cardiology 2, 1
• Surgical options for Type A dissection include implantation of a composite graft in the ascending aorta with or without coronary artery reimplantation 3
• Supracommisural graft implantation is an option when the root is normal and the valve is intact 4
• Valve resuspension is adequate in about 50% of chronic Type A cases when commissures are detached 4
• Subtotal or total arch replacement may be necessary, including reconnection of supraaortic vessels during hypothermic circulatory arrest 2

Surgical Management Techniques

• Replacement of affected portions with a tubular graft of appropriate length and size is a standard approach for acute and chronic dissections of the descending aorta 5
• A posterolateral chest incision is commonly used, with most surgeons using extracorporeal circulation via left heart bypass 5
• Moderate hypothermia with equalized perfusion pressures is recommended during graft implantation 5

Follow-up Care and Chronic Management

• Switch from intravenous to oral beta-blockers after 24 hours if gastrointestinal transit is preserved, as recommended by the American Heart Association 1
• Regular imaging follow-up is necessary to monitor for complications such as false lumen expansion or aneurysm formation 1
• Consider reoperation when the dissected aorta becomes aneurysmatic (5-6 cm in diameter) or when dissection was improperly repaired initially 6
• For chronic Type A dissection, surgery is indicated if symptoms develop, aortic regurgitation occurs, or aortic diameter exceeds 5-6 cm 7
• For chronic Type B dissection, surgery is indicated if symptoms develop or progressive aortic enlargement reaches 6.0 cm 7
• Consider endovascular stenting if surgical indication exists and anatomy is suitable 7

Special Considerations

• Lifelong beta-adrenergic blockade is recommended for patients with hereditary diseases (Marfan syndrome, Ehlers-Danlos syndrome) to prevent dissection 1
• In cases of malperfusion, higher blood pressure may be tolerated to optimize perfusion to the threatened region 1
• Pregnant patients require management by a multidisciplinary team at specialized centers, using drugs with the lowest teratogenic impact 1

Common Pitfalls and Caveats

• The rate of reoperation for Type A dissection is approximately 10% at 5 years and up to 40% at 10 years after primary surgery, with even higher risk in Marfan syndrome patients 6
• Repeat sternotomy requires great care as the aorta is usually unprotected by the pericardium 7

Emergency Surgical Management of Type A Aortic Dissection in Combined Type A/B Cases

Indications for Immediate Type A Repair

• In patients with acute aortic dissection that involves both the ascending (type A) and descending (type B) aorta, emergency surgical repair of the type A component is mandatory to prevent death from rupture or tamponade, while the type B component is treated medically unless complications arise. 8
• Untreated type A dissection carries a 48‑hour mortality of approximately 50 %. [9][8]

Surgical Decision Pathways for the Type A Component

Normal‑Sized Root and Intact Valve

• Perform a supracommissural tubular graft replacement at the sinotubular junction when the aortic root is normal‑sized and the aortic valve is intact. [8][10]
• If the commissures are detached, resuspend the valve leaflets before inserting the graft. 8

Ectatic Root or Abnormal Valve

• Implant a composite graft (valve plus ascending‑aortic tube graft) using the Bentall technique for patients with a dilated root or valve pathology (e.g., connective‑tissue disease). 8

Extension Into the Arch

• When the dissection extends into the aortic arch, consider subtotal or total arch replacement with reconnection of the supra‑aortic vessels performed under hypothermic circulatory arrest. 8

Technical Considerations During Type A Repair

• Access the aorta through a median sternotomy with careful pericardial incision to avoid injury to the friable dissected tissue. 8
• Establish cardiopulmonary bypass via femoral artery and right‑atrial cannulation. 8
• Reconstruct the dissected aortic layers using either Teflon felt strips or gelatin‑resorcinol‑formaldehyde (GRF) glue; GRF glue is technically easier and reduces operative time. [11][10]

Medical Management of the Type B Component

• The type B dissection is managed medically during and after type A repair unless complications develop. [10][8]
• No proven superiority of surgical or endovascular intervention exists for uncomplicated type B dissections. [11][10]

Indications for Intervention on the Type B Segment

• Persistent or recurrent pain despite optimal medical therapy. 8
• Evidence of early aortic expansion or impending rupture on imaging. 8
• Malperfusion syndromes affecting mesenteric, renal, or limb circulation. 8
• Neurologic deficits attributable to spinal‑cord ischemia. 8
• Documented aortic rupture. 8

Alternative Treatment Options for Complicated Type B Dissection

• Open surgical replacement with a tubular graft remains an option when endovascular repair is not feasible. 10