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Norepinephrine increases tolerance to acute anemia.

Jens Meier1, Andreas Pape, Daria Loniewska

  • 1Department of Anesthesiology, Intensive Care Medicine, and Pain Control, J. W. Goethe-University Hospital, Frankfurt, Germany. Meier@em.uni-frankfurt.de

Critical Care Medicine
|April 25, 2007
PubMed
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Norepinephrine stabilized mean aortic pressure (MAP) and coronary perfusion pressure, significantly reducing mortality in extreme anemia. However, its sole long-term use is not recommended due to side effects, emphasizing the need for erythrocyte transfusions.

Area of Science:

  • Cardiovascular Physiology
  • Anesthesiology
  • Critical Care Medicine

Background:

  • Extreme anemia compromises myocardial oxygen supply through reduced arterial oxygen content and decreased mean aortic pressure (MAP), impacting coronary perfusion.
  • Standard treatments for low arterial oxygen content include oxygen ventilation and red blood cell transfusion.
  • The efficacy of solely stabilizing MAP and coronary perfusion pressure with norepinephrine in improving tolerance to extreme anemia remains unclear.

Purpose of the Study:

  • To investigate whether maintaining mean aortic pressure (MAP) with norepinephrine can improve tolerance to extreme anemia.
  • To assess the impact of norepinephrine on mortality and blood exchangeable volume during hemodilution in an animal model.

Main Methods:

  • A prospective, randomized, controlled study was conducted in 28 anesthetized, mechanically ventilated pigs.

Related Experiment Videos

  • Two protocols were used: 1) hemodilution to a critical hemoglobin concentration with either observation or MAP stabilization by norepinephrine infusion for 6 hours, and 2) hemodilution until death with or without norepinephrine to maintain MAP >60 mm Hg.
  • Primary outcomes included 6-hour mortality and maximum exchangeable blood volume.

    • Main Results:

    • Norepinephrine administration reduced 6-hour mortality from 100% to 14% at critical hemoglobin levels.
    • Maintaining MAP with norepinephrine allowed for a significantly greater exchangeable blood volume (125 mL/kg) compared to controls (76 mL/kg).

    Conclusions:

    • Norepinephrine can serve as a first-line intervention to temporarily manage acute anemia by stabilizing MAP and coronary perfusion pressure.
    • Sole long-term use of norepinephrine in extreme anemia without erythrocyte transfusion is not advised due to potential side effects.