Proximal conduit obstruction after Sano modified Norwood procedure

Area of Science:

• Pediatric Cardiac Surgery
• Congenital Heart Disease Management
• Cardiovascular Research

Background:

• The Sano modification is a surgical technique for first-stage palliation in hypoplastic left heart syndrome (HLHS).
• This approach uses a right ventricle to pulmonary artery conduit, with preliminary favorable outcomes reported.
• However, the long-term safety and potential complications of this technique are not yet fully understood due to limited experience.

Observation:

• A case of sudden death occurred in a patient who underwent the Sano modification for HLHS.
• The patient experienced obstruction of the proximal right ventricle to pulmonary artery conduit.
• This lethal complication, caused by fibrointimal hyperplasia, presented three months after the initial surgical palliation.

Findings:

• Fibrointimal hyperplasia can lead to severe, life-threatening obstruction of the right ventricle to pulmonary artery conduit used in the Sano modification.
• The obstruction in this case was proximal, directly impacting the conduit's function.
• The adverse event occurred within a critical three-month window after the initial surgical palliation.

Implications:

• Early and routine cardiac catheterization may be crucial for detecting subclinical conduit obstruction after the Sano modification.
• Consideration of earlier second-stage palliation might be necessary to mitigate the risk of conduit-related mortality.
• Further research and extended follow-up are essential to fully characterize the risks and benefits of this HLHS surgical technique.