Overview
Functionally univentricular heart represents a spectrum of congenital heart defects where only one ventricle is functionally viable for systemic circulation, often requiring staged surgical palliation to optimize hemodynamics and oxygenation.Diagnosis
Echocardiography essential for initial diagnosis, assessing ventricular function, atrioventricular valve anatomy, and pulmonary blood flow.
Cardiac catheterization may be required for detailed hemodynamic assessment and pressure measurements 1.
Identification of specific anatomical subtypes (e.g., left ventricular morphology, outlet chamber configuration) crucial for surgical planning 2.Management
Pulmonary Artery Banding: Performed to reduce pulmonary blood flow, typically in early infancy but can be effective beyond neonatal period with careful monitoring of hemodynamic outcomes 1.
Surgical Repair: Ventricular septation recommended for patients with suitable anatomy, particularly those without outlet foramen obstruction 2.
Palliative Procedures: Bidirectional Glenn shunt and Fontan procedures staged based on patient's clinical status and hemodynamic needs 1.Special Populations
Pediatrics: Early intervention critical; outcomes vary with age at banding and surgical complexity 12.
Comorbidities: Small ventricular size and outlet foramen obstruction identified as significant risk factors for adverse outcomes 2.Key Recommendations
Consider pulmonary artery banding beyond the neonatal period for managing increased pulmonary blood flow in functionally univentricular hearts, with close hemodynamic monitoring post-banding (Evidence: Moderate 1).
Ventricular septation should be carefully considered in patients with unobstructed outlet foramen and adequate ventricular size, recognizing high perioperative mortality risks (Evidence: Moderate 2).
Stage surgical palliations (e.g., Glenn shunt, Fontan) based on clinical progression and hemodynamic stability, tailoring to individual patient needs (Evidence: Expert opinion).References
1 Sasikumar N, Ramanan S, Rema KM, Subramanyan R, Kumar RS, Cherian KM. Pulmonary artery banding for univentricular heart beyond the neonatal period. Asian cardiovascular & thoracic annals 2014. link
2 McKay R, Pacifico AD, Blackstone EH, Kirklin JW, Bargeron LM. Septation of the univentricular heart with left anterior subaortic outlet chamber. The Journal of thoracic and cardiovascular surgery 1982. link