The failing Fontan.

Area of Science:

• Pediatric Cardiology
• Congenital Heart Disease
• Cardiac Surgery

Background:

• The Fontan procedure, pioneered nearly 50 years ago, is a palliative surgical option for complex congenital heart defects involving single ventricles.
• While effective in restoring systemic oxygenation, it creates a unique circulatory system with inherent long-term challenges.

Purpose of the Study:

• To review the long-term implications of the Fontan circulation.
• To emphasize the critical need for continuous patient surveillance and timely interventions.
• To discuss eventual treatment strategies for Fontan-associated circulatory failure.

Main Methods:

• Literature review of Fontan operation outcomes and complications.
• Analysis of hemodynamic principles governing single-ventricle physiology post-Fontan.
• Discussion of current and future management strategies for Fontan patients.

Main Results:

• The Fontan circulation results in elevated systemic venous pressure and congestion, contributing to progressive end-organ damage, particularly hepatic dysfunction.
• Despite palliative success, the Fontan circuit is prone to eventual failure, necessitating lifelong monitoring.

Conclusions:

• Fontan-associated circulatory dysfunction requires vigilant, long-term management including medical, catheter-based, and surgical interventions.
• Heart transplantation or mechanical circulatory support (ventricular assist device) represents the ultimate solution for end-stage Fontan failure.