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Preoperative haemodilution.

B Lisander1

  • 1Department of Anaesthesiology and Intensive Care, Sahlgren's Hospital, Gothenburg, Sweden.

Acta Anaesthesiologica Scandinavica. Supplementum
|January 1, 1988
PubMed
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Preoperative hemodilution reduces donor blood needs by saving red blood cells, but can impair tissue oxygenation, especially in patients with cardiovascular conditions.

Area of Science:

  • Anesthesiology
  • Transfusion Medicine

Background:

  • Preoperative hemodilution involves withdrawing blood before surgery and infusing cell-free fluid to maintain normovolemia.
  • This technique reduces red blood cell loss during surgical bleeding and decreases the need for donor blood through reinfusion.

Purpose of the Study:

  • To evaluate the implications of preoperative hemodilution on tissue oxygenation.
  • To identify contraindications and risks associated with this blood management strategy.

Main Methods:

  • The study reviews the physiological effects of hemodilution, focusing on oxygen transport and tissue oxygenation.
  • It examines compensatory mechanisms like increased cardiac output and oxygen extraction.
  • Contraindications such as coronary insufficiency, ventricular failure, and valvular disease are discussed.

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Main Results:

  • Dilutional anemia can compromise tissue oxygenation, necessitating effective compensatory mechanisms.
  • Compensatory mechanisms are less efficient in patients with vascular stenosis, particularly myocardial stenosis.
  • Potential risks include increased cardiac oxygen consumption and heart rate due to factors like hypovolemia and hypoxemia.

Conclusions:

  • Preoperative hemodilution is a blood-saving measure but requires careful patient selection due to potential risks to tissue oxygenation.
  • Contraindications include significant cardiovascular conditions.
  • Optimal results are achieved when combined with other blood conservation strategies and require vigilant management.