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Internal mammary artery bypass graft for impaired coronary perfusion after neonatal arterial switch operation
R G Grabitz1, B J Messmer, M C Seghaye
1Department of Pediatric Cardiology, RWTH Aachen, FRG.
Insights
A novel surgical technique successfully used a right internal mammary artery bypass graft to restore blood flow to a critical coronary artery in a newborn following arterial switch operation. This intervention prevented myocardial ischemia and ensured normal cardiac function long-term.
Area of Science:
- Cardiovascular Surgery
- Pediatric Cardiology
- Neonatal Critical Care
Background:
- Transposition of the Great Arteries (TGA) is a critical congenital heart defect requiring surgical correction.
- Perioperative myocardial ischemia due to impaired coronary artery perfusion is a significant cause of mortality after neonatal arterial switch operation (ASO).
- Maintaining adequate coronary artery perfusion is vital for successful TGA repair outcomes.
Observation:
- A newborn undergoing ASO experienced insufficient perfusion of a dominant right coronary artery.
- The surgical team opted to use the right internal mammary artery (RIMA) as an arterial bypass graft.
- The RIMA was anastomosed to the affected right coronary artery to restore blood flow.
Findings:
- Postoperative coronary angiography at 8 months confirmed successful perfusion of the right coronary artery via the RIMA bypass.
- Long-term follow-up exceeding 30 months demonstrated sustained graft patency.
- The patient exhibited normal somatic development and cardiac function, with regular biventricular contractility.
Implications:
- The RIMA can be a viable and effective bypass graft for managing coronary artery insufficiency in neonates post-ASO.
- This technique offers a potential solution to reduce perioperative mortality associated with coronary perfusion issues in TGA repair.
- Successful RIMA grafting ensures long-term cardiac health and normal development in affected infants.
Abstract:
Myocardial ischaemia caused by perfusion impairment of translocated coronary arteries is the major cause of perioperative mortality after neonatal arterial switch operation for transposition of the great arteries. We report the successful use of the right internal mammary artery as a bypass graft to a dominant right coronary artery to treat insufficient perfusion of this artery in a newborn. Eight months later, coronary angiography showed a full blood supply of the right coronary artery across the internal mammary anastomosis. After a follow-up period of more than 30 months, somatic development, electrocardiogram and echocardiographically determined contractility of both ventricles are practically normal indicating regular function of the bypass graft.