Cannulation for veno-venous extracorporeal membrane oxygenation

Area of Science:

• Cardiovascular and Respiratory Medicine
• Medical Engineering

Background:

• Extracorporeal membrane oxygenation (ECMO) utilizes a cardiopulmonary bypass circuit for blood oxygenation.
• Veno-venous (VV) ECMO returns oxygenated blood to the venous system, posing a risk of recirculation.

Purpose of the Study:

• To analyze factors influencing recirculation in VV ECMO.
• To compare different VV ECMO cannulation strategies and their efficiency.

Main Methods:

• Review of VV ECMO principles, including cannula types (single vs. dual lumen) and drainage/reinfusion sites (IVC, SVC).
• Analysis of factors affecting recirculation: draining/return positions, pump flow, and cardiac output.
• Evaluation of cannulation strategies: dual lumen in right jugular vein, or separate cannulas in IVC/SVC.

Main Results:

• Recirculation is an inherent risk in VV ECMO, influenced by cannula positioning, flow rates, and patient cardiac output.
• Different cannulation strategies exist, including dual lumen or two single lumen cannulas, with varying recirculation risks.
• Draining from the superior vena cava (SVC) is more efficient for veno-arterial (VA) ECMO conversion due to lower oxygen saturation and reduced dual circulation risk.

Conclusions:

• VV ECMO efficiency depends on careful cannula placement and monitoring, irrespective of the chosen strategy.
• Draining from the SVC offers advantages when transitioning to VA ECMO.
• Optimizing cannulation strategies minimizes recirculation and enhances ECMO circuit efficiency.