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Anesth Analg 2003;96:1572-1577
© 2003 International Anesthesia Research Society


CARDIOVASCULAR ANESTHESIA

Acute Intravascular Volume Expansion with Rapidly Administered Crystalloid or Colloid in the Setting of Moderate Hypovolemia

David R. McIlroy, MB BS, FANZCA, and Evan D. Kharasch, MD PhD

Department of Anesthesiology, University of Washington Medical Center, Seattle

Address correspondence and reprint requests to David McIlroy, Department of Anesthesia and Pain Management, Alfred Hospital, Commercial Rd., Melbourne 3004, Victoria, Australia. Address e-mail to d.mcilroy{at}alfred.org.au

Although the distribution of various crystalloid and colloid solutions at equilibrium has been well established, the acute peak expansion of intravascular volume that can be achieved with the rapid administration of crystalloid or colloid is unknown. We studied eight healthy male subjects in a two-part crossover trial designed to assess the maximal increase in intravascular volume achieved with 1000 mL of lactated Ringer’s solution compared with the same volume of 6% Hetastarch. Subjects were made moderately hypovolemic by the withdrawal of 900 mL of blood, and then the crystalloid or colloid solution was rapidly infused over 5–7 min. Serial dilution of hematocrit was measured every 5 min for 30 min to determine changes in blood volume. Peak expansion of intravascular volume with lactated Ringer’s solution was 630 ± 127 mL, occurring immediately the rapid infusion was complete, whereas the peak expansion of intravascular volume with 6% Hetastarch was 1123 ± 116 mL and occurred 5 min after the completion of the fluid infusion. The results were significantly different (P < 0.001). These results would suggest that even for very short periods of time, rapid infusion of colloid significantly more effectively increases blood volume and, by inference, cardiac output than the same volume of crystalloid, even if the crystalloid is administered very rapidly.

IMPLICATIONS: Under conditions of moderate hypovolemia, the maximal acute intravascular volume expansion with the rapid infusion of 1000 mL of lactated Ringer’s solution is slightly more than half that achieved with the same volume of 6% Hetastarch.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins and Stanford University Libraries' HighWire Press®. Copyright 2003 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 2003 by the International Anesthesia Research Society.