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Transfusion-free neonatal cardiopulmonary bypass using a TinyPump.

Shinya Ugaki1, Osami Honjo, Mahito Nakakura

  • 1Department of Cardiovascular Surgery, Okayama University Hospital, Okayama, Japan. uga-strah@hotmail.co.jp

The Annals of Thoracic Surgery
|October 26, 2010
PubMed
Summary

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A novel miniaturized circuit with TinyPump-assisted venous drainage maintained hematocrit and cardiopulmonary function in neonatal piglets without blood transfusion. This approach may reduce blood needs and inflammatory responses in neonatal open-heart surgery.

Area of Science:

  • Cardiovascular Surgery
  • Biomedical Engineering
  • Neonatal Care

Background:

  • Conventional cardiopulmonary bypass circuits require significant priming volume, often necessitating blood transfusion in neonates.
  • Minimizing circuit volume and blood usage is crucial for improving outcomes in neonatal cardiac surgery.
  • Inflammatory and coagulation cascades are activated during cardiopulmonary bypass, posing risks to neonates.

Purpose of the Study:

  • To evaluate a miniaturized circuit with TinyPump-assisted venous drainage in neonatal piglets.
  • To determine if this system can maintain hematocrit levels without blood transfusion.
  • To assess the impact on coagulation and inflammatory responses compared to conventional circuits.

Main Methods:

  • A miniaturized circuit with a TinyPump was compared to a conventional blood-primed circuit in 1-week-old piglets.

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  • Cardiopulmonary bypass (CPB) was performed for 2 hours, followed by modified ultrafiltration (MUF).
  • Hematocrit, coagulation markers, inflammatory markers, pulmonary vascular resistance, and lung water content were measured.

    • Main Results:

    • The miniaturized circuit required significantly less priming volume (152 mL vs. 300 mL).
    • Hematocrit levels were comparable between groups during CPB and after MUF.
    • The miniaturized circuit group showed significantly lower thrombin-antithrombin complex and interleukin-8 levels post-MUF.
    • Pulmonary vascular resistance index and lung water content were significantly improved in the miniaturized circuit group.

    Conclusions:

    • The miniaturized circuit with TinyPump-assisted venous drainage effectively maintained hematocrit and cardiopulmonary function in neonatal piglets.
    • This technique shows potential to reduce blood requirements and inflammatory responses in neonatal open-heart surgery.
    • Further clinical application may lead to improved outcomes for neonates undergoing cardiac procedures.