What is the recommended management for an interrupted aortic arch identified on angiography?

Management of Interrupted Aortic Arch

For neonates and infants with interrupted aortic arch (IAA), urgent single-stage surgical repair with direct arch anastomosis and ventricular septal defect (VSD) closure is the definitive treatment, performed after stabilization with prostaglandin E1. For the rare adult presentation, management depends on symptoms, anatomy, and collateral circulation, with surgical reconstruction remaining the standard approach despite emerging endovascular options 1, 2.

Neonatal/Infant Management (Standard Presentation)

Initial Stabilization

• Immediate prostaglandin E1 infusion to maintain ductal patency and systemic perfusion 2
• Allow complete resuscitation over several days before surgery if needed 2
• Assess for associated anomalies (VSD in 90%, bicuspid aortic valve, DiGeorge syndrome) 2, 3

Surgical Approach

One-stage primary repair is the preferred strategy 2:

• Direct arch anastomosis (no interposition graft in neonates)
• Concomitant VSD closure during same operation
• Selective cerebral perfusion with near-infrared monitoring 2
• Avoid subaortic resection during initial neonatal repair unless absolutely necessary 2

Critical caveat: This repair is physiologically corrective but not fully corrective due to high incidence of late left ventricular outflow tract obstruction (LVOTO) requiring reintervention 2, 4.

Adult Presentation (Rare)

Diagnostic Approach

• CT angiography (CTA) is the imaging modality of choice for morphologic evaluation 5, 6
• Assess IAA type (A, B, or C based on interruption location)
• Evaluate extent of collateral circulation (critical for survival into adulthood) 5, 7
• Look for associated cardiac anomalies (though isolated IAA more common in adults) 5

Treatment Decision Algorithm

For symptomatic adults or those with inadequate collaterals:

• Surgical reconstruction remains the recommended approach 1
• Options include:
  • Extra-anatomic bypass (ascending to descending aorta with Dacron graft) 8, 9
  • Off-pump bypass without cardiopulmonary bypass in heavily collateralized patients 9
  • Direct arch reconstruction if anatomy permits 6

For asymptomatic adults with extensive collaterals:

• Conservative management with close follow-up may be reasonable 5, 7
• Control hypertension aggressively (nearly universal in adult IAA) 5, 9
• Serial imaging surveillance

Emerging endovascular approach:

• Increasingly considered as alternative to surgery 1
• Stepwise endovascular management being developed 1
• However, surgical reconstruction remains standard of care given limited long-term data

Long-Term Considerations

High-Risk Features for Poor Outcomes

Based on 30-year follow-up data 4:

• Type B IAA (aHR 3.32) - interruption distal to left common carotid
• Staged repair (aHR 2.50) versus single-stage
• LVOTO requiring intervention during initial hospitalization (aHR 4.12)

Mandatory Long-Term Surveillance

• LVOTO develops frequently and requires monitoring 2, 4
• May need subaortic resection or extensive LVOT enlargement procedures 2
• Developmental follow-up essential (DiGeorge syndrome in ~50% causes moderate-severe developmental delay) 2
• 30-year survival reaches 80.7% for hospital discharge survivors 4

Key Clinical Pitfalls

1. Missing the diagnosis in adults: Check upper versus lower extremity blood pressures in all hypertensive patients 5
2. Premature subaortic intervention: Avoid addressing subaortic stenosis during neonatal repair unless critically obstructive 2
3. Underestimating LVOTO risk: This is NOT a one-time repair - expect reinterventions 2, 4
4. Ignoring DiGeorge screening: Affects ~50% and requires specific developmental support 2

The evidence strongly supports urgent neonatal surgical repair as Class I recommendation, while adult management requires individualized assessment of symptoms, anatomy, and collateral adequacy, with surgery remaining the gold standard despite emerging endovascular techniques.