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Does CO(2) flushing of the empty CPB circuit decrease the number of gaseous emboli in the prime?

J Nyman1, C Rundby, P Svenarud

  • 1Karolinska Institutet, Department of Molecular Medicine and Surgery, Stockholm, Sweden. Jesper.nyman@karolinska.se

Perfusion
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Carbon dioxide (CO2) flushing of cardiopulmonary bypass (CPB) circuits significantly reduces gaseous emboli compared to air-filled circuits. This CO2 method enhances patient safety during cardiac surgery by minimizing microemboli.

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Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Anesthesiology

Background:

  • Gaseous emboli formation in cardiopulmonary bypass (CPB) circuits is a significant risk during cardiac surgery.
  • Conventional CPB circuits are typically primed with air, potentially leading to microemboli introduction.
  • Minimizing microemboli is crucial for preventing neurological and systemic complications.

Purpose of the Study:

  • To evaluate the efficacy of carbon dioxide (CO2) flushing in reducing gaseous microemboli during CPB circuit priming.
  • To compare microemboli counts in CO2-flushed circuits versus conventional air-filled circuits.

Main Methods:

  • Twenty CPB circuits were randomized into two groups: CO2 flushed and control (air-filled).
  • CO2 group circuits were flushed with CO2 (10 L/min) for 5 minutes before priming.
  • Microemboli were quantified using Doppler in the arterial line for 15 minutes, with mechanical agitation applied at the 14th minute.

Main Results:

  • The CO2-flushed group exhibited significantly lower median microemboli counts compared to the control group throughout the experiment (p < 0.004).
  • Initial microemboli counts were lower in the CO2 group (264.5) versus the control group (380.5) (p=0.01).
  • Mechanical agitation increased microemboli in both groups, but the CO2 group consistently showed fewer emboli.

Conclusions:

  • CO2 flushing of CPB circuits effectively decreases the number of gaseous emboli in the prime fluid compared to conventional air-filled circuits.
  • This technique offers a potential strategy to enhance patient safety by reducing microemboli load during CPB.
  • Oxygenator agitation releases gaseous emboli, and circuit re-circulation duration influences microemboli levels.