Cannulation strategy for aortic arch reconstruction using deep hypothermic circulatory arrest.

Area of Science:

• Pediatric Cardiac Surgery
• Computational Fluid Dynamics
• Neonatal Hemodynamics

Background:

• Aortic arch reconstruction in neonates often uses deep hypothermic circulatory arrest.
• Concerns exist regarding neurologic outcomes and optimal cannulation for cerebral perfusion.
• Investigating different arterial cannulation strategies is crucial for neonatal cardiac surgery.

Purpose of the Study:

• To investigate the effect of different arterial cannulation strategies on cerebral and systemic flow in neonates.
• To compare four distinct cannulation approaches using computational fluid dynamics.
• To determine the optimal cannulation strategy for neonatal aortic arch reconstruction.

Main Methods:

• Utilized a realistic hypoplastic neonatal aorta model.
• Simulated four cannulation strategies: right innominate artery, innominate root, patent ductus arteriosus (PDA), and innominate root with PDA.
• Evaluated performance based on predicted cerebral and systemic flow distributions.

Main Results:

• Cannulation strategies showed varied local hemodynamics but no significant impact on overall flow distribution.
• The maximum difference in flow distribution was minimal (0.8% of cardiac output).
• Pulmonary artery snaring provided uniform benefit to all systemic vessels.

Conclusions:

• Downstream vascular resistance, not cannulation strategy, primarily dictates flow distribution in neonates.
• Surgical teams can select preferred cannulation methods based on this finding.
• Patients with aortic coarctation may benefit from a dual cannulation approach (innominate root and PDA).