Four right ventricle to pulmonary artery conduit types

Area of Science:

• Cardiovascular Surgery
• Congenital Heart Disease
• Biomaterials in Medicine

Background:

• The optimal valved conduit for right ventricle to pulmonary artery (RV-PA) reconstruction in congenital heart defects is debated.
• Durability and patient-specific factors influence long-term outcomes.

Purpose of the Study:

• To compare the durability of four common RV-PA conduits.
• To identify factors influencing conduit failure and longevity.

Main Methods:

• Retrospective analysis of 959 RV-PA conduits implanted over 30 years.
• Analysis of conduit dysfunction, reintervention, and replacement using time-to-failure models.
• Evaluation of patient weight, conduit size (z-score), type, and position.

Main Results:

• Homografts demonstrated superior durability compared to xenografts (porcine, bovine jugular vein).
• Smaller composite porcine valve conduits had inferior durability; larger sizes performed better.
• Bovine jugular vein conduits were less durable than homografts, except in the smallest patients.
• Freedom from dysfunction at 8 years: Aortic homograft (60.7%), Pulmonary homograft (72%), Porcine (51.2%), Bovine jugular vein (41.3%).

Conclusions:

• Pulmonary and aortic homografts are more durable RV-PA conduits than xenografts, particularly in patients weighing 5-20 kg.
• Judicious conduit oversizing is a critical surgeon-modifiable factor for improving conduit longevity.