An important complication of Hancock mitral valve replacement in children

Area of Science:

• Cardiology
• Pediatric Surgery
• Biomaterials Science

Background:

• Severe mitral insufficiency in children presents significant challenges.
• Mitral valve replacement (MVR) is a critical intervention for pediatric heart conditions.
• Porcine heterograft valves are utilized in pediatric cardiac surgery.

Purpose of the Study:

• To evaluate the efficacy and safety of Hancock porcine heterograft valves in pediatric patients undergoing MVR.
• To assess long-term outcomes, including complications, in children receiving these valves.

Main Methods:

• Retrospective analysis of nine pediatric patients (ages 2-15) who underwent MVR with Hancock porcine heterograft valves.
• Valves ranged in size from 19-31 mm.
• Follow-up duration ranged from 1.6 to 6.1 years (mean 4.3 years).

Main Results:

• All nine children showed marked postoperative improvement.
• No thromboembolic complications or endocarditis were observed, despite no long-term anticoagulation.
• Three patients (33%) developed severe fibrocalcific obstruction of the heterograft, necessitating re-replacement at 3.5, 3.6, and 4.8 years post-MVR.

Conclusions:

• Hancock porcine heterograft valves provide significant short-term benefits for pediatric MVR, including improved function and absence of major complications like thromboembolism.
• A previously unreported complication of severe fibrocalcific obstruction emerged in a subset of pediatric patients, highlighting a critical factor for consideration in surgical decision-making and long-term management.
• Further research into the mechanisms and prevention of heterograft obstruction in children is warranted.