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Veno-Venous Extracorporeal Membrane Oxygenation in a Mouse
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Recirculation during veno-venous extra-corporeal membrane oxygenation--a simulation study.

Mikael Broman1, Björn Frenckner, Anna Bjällmark

  • 12 Department of Medical Cellbiology/Section for Physiology, Biomedical Center, Uppsala University, Uppsala - Sweden.

The International Journal of Artificial Organs
|January 16, 2015
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Recirculation in veno-venous ECMO (extracorporeal membrane oxygenation) reduces oxygen delivery efficiency. Simulation and clinical data show recirculation depends on ECMO flow, cardiac output, and cannula placement, with peripheral drainage being optimal.

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Area of Science:

  • Cardiovascular Physiology
  • Medical Simulation
  • Respiratory Support

Background:

  • Veno-venous extracorporeal membrane oxygenation (VV-ECMO) is crucial for severe respiratory failure.
  • Recirculation, the return of oxygenated blood to the heart before systemic circulation, impairs VV-ECMO efficacy.
  • Quantifying recirculation is challenging, hindering optimization of VV-ECMO therapy.

Purpose of the Study:

  • To identify and quantify factors contributing to recirculation in VV-ECMO using a simulation model.
  • To compare simulation findings with clinical data from adult VV-ECMO patients.
  • To improve understanding and management of recirculation in VV-ECMO.

Main Methods:

  • Development of a closed-loop, real-time cardiovascular simulation model.
  • Simulation of VV-ECMO with varying flow rates (0-5 L/min) and cannulation strategies (RA to IVC, IVC to RA, SVC+IVC to RA).
  • Comparison of simulation results with retrospective clinical data from 11 adult VV-ECMO patients.

Main Results:

  • Recirculation was found to increase with higher VV-ECMO flow rates.
  • Increased cardiac output was associated with decreased recirculation.
  • Cannulation site significantly impacts recirculation; more peripheral drainage sites substantially reduce it.

Conclusions:

  • Recirculation is a significant clinical issue in VV-ECMO, consistent across simulations and clinical observations.
  • Optimizing VV-ECMO requires focusing on arterial oxygenation parameters due to measurement difficulties of venous oxygen saturation.
  • Simulation models offer a valuable tool for quantifying and understanding recirculation in VV-ECMO.