Blood flow analysis with computational fluid dynamics in the left atrium after left atrial plication: a prospective...

Area of Science:

• Cardiology
• Medical Imaging
• Computational Fluid Dynamics

Background:

• Enlarged left atrium (LA) is associated with blood flow stagnation, increasing risks in patients with chronic atrial fibrillation.
• Left atrial appendage resection (LAAR) is a common intervention, but its efficacy in reducing stagnation is debated.
• Left atrial plication (LAP) is a newer technique for managing enlarged LA.

Purpose of the Study:

• To evaluate blood flow stagnation in enlarged left atria (LA).
• To demonstrate the effectiveness of left atrial plication (LAP) in alleviating blood flow stagnation.
• To compare the efficacy of LAP with virtual left atrial appendage resection (LAAR).

Main Methods:

• Computational fluid dynamics (CFD) analysis was performed on five patients with enlarged LA undergoing mitral valve surgery and LAP.
• Preoperative and postoperative imaging (CT and 4D-flow MRI) were used for CFD modeling.
• CFD analysis assessed blood flow stagnation in three scenarios: preoperative, virtual LAAR, and LAP.

Main Results:

• Preoperatively, significant blood flow stagnation was observed in the enlarged LA and left atrial appendage.
• Following LAP, average stagnation volume decreased to 35.88 ± 8.20, and constant stagnation volume reduced to 21.14 ± 7.70.
• LAP demonstrated significantly greater reduction in both average and constant stagnation volumes compared to virtual LAAR (p < 0.05).

Conclusions:

• Blood flow stagnation is a significant issue in enlarged left atria (LA), particularly in the left atrial appendage.
• Left atrial plication (LAP) effectively improves blood flow dynamics within the enlarged LA.
• CFD analysis confirms LAP as a superior method for reducing blood flow stagnation compared to LAAR alone.