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Congenital Coronary Artery Anomalies

Awais Ashfaq, MD, Jack Wallen, MD, PhD, Alan O’Donnell, PA-C
Past Author: James S. Tweddell, MD

Key Points

  • Congenital coronary artery anomalies are rare but clinically important due to their association with myocardial ischemia and sudden cardiac death.
    • Major types discussed include:
      • Anomalous origin of coronary arteries (e.g., ALCAPA—anomalous left coronary artery from the pulmonary artery, AAOCA—anomalous aortic origin of a coronary artery)
      • Coronary artery fistulas
      • Congenital coronary ostial stenosis/atresia
    • The most clinically significant variants are those with an interarterial course, particularly AAOLCA (left coronary from right sinus) and AAORCA (right coronary from left sinus), due to their association with sudden cardiac death.
  • Diagnostic modalities include echocardiography, Cardiac MRI, Cardiac catheterization and / or exercise stress testing
  • Surgical intervention is the mainstay for symptomatic or high-risk anomalies, mainly intramural, interarterial course.
    • For ALCAPA, coronary reimplantation is the preferred approach, with normalization of left ventricular function and improvement in mitral regurgitation being typical outcomes.
    • Coronary artery bypass grafting (CABG) has a limited role, mainly reserved for cases with significant atherosclerotic narrowing or when other approaches are unsatisfactory, due to issues with competitive flow and graft durability in young patients.
  • Lifelong follow-up is recommended for all patients with repaired or unrepaired anomalies.
    • Patients are counseled to avoid competitive athletics for a defined period post-surgery, with individualized recommendations based on presentation and recovery.

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Last updated: October 7, 2025