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Related Experiment Videos

Anaesthesia and circulating blood volume.

Y Sano1, A Sakamoto, Y Oi

  • 1Nippon Medical School, Department of Anaesthesiology, Tokyo, Japan. yuka-ki@bd5.so-net.ne.jp

European Journal of Anaesthesiology
|May 17, 2005
PubMed
Summary
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General anesthesia increases blood volume (BV). Estimating BV changes using colloid osmotic pressure (COP) offers a reliable method for monitoring fluid shifts during anesthesia.

Area of Science:

  • Anesthesiology
  • Physiology
  • Critical Care Medicine

Background:

  • Accurate measurement of circulating blood volume (BV) during general anesthesia remains challenging due to a lack of standardized methods.
  • Previous studies have not definitively established the impact of general anesthesia on BV.

Purpose of the Study:

  • To evaluate changes in blood volume (BV) during general anesthesia using simple estimation techniques.
  • To compare estimated BV changes with directly measured BV.

Main Methods:

  • Fourteen patients undergoing minor surgery under general anesthesia were studied.
  • Blood hematocrit (Hct), total protein (TP), and colloid osmotic pressure (COP) were measured pre-anesthesia and at 30, 60, and 90 minutes post-induction.
  • Blood volume was calculated using Allen's formula and changes in Hct, TP, and COP, and compared to indocyanine green dilution method (BV(ICG)).

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Main Results:

  • Significant decreases in Hct, TP, and COP were observed post-anesthesia induction.
  • Both calculated BV and BV(ICG) showed significant increases after anesthesia induction.
  • BV changes estimated from COP variations closely approximated the directly measured BV(ICG) changes.

Conclusions:

  • General anesthesia leads to an increase in circulating blood volume (BV).
  • Estimating BV changes via alterations in colloid osmotic pressure (COP) provides a sensitive and reliable indicator of fluid shifts during anesthesia.