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Anesth Analg 2007; 105:1736-1740
© 2007 International Anesthesia Research Society
doi: 10.1213/01.ane.0000286233.48111.d8
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OBSTETRIC ANESTHESIOLOGY

The Accuracy of Blood Loss Estimation After Simulated Vaginal Delivery

Paloma Toledo, MD, Robert J. McCarthy, PharmD, Bradley J. Hewlett, BS, Paul C. Fitzgerald, RN, MS, and Cynthia A. Wong, MD

From the Department of Anesthesiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Address correspondence and reprint requests to Cynthia A. Wong, MD, Department of Anesthesiology, 251 E. Huron St., F5-704, Chicago, IL 60611. Address e-mail to c-wong2{at}northwestern.edu.

Abstract

BACKGROUND: Visual blood loss estimation often underestimates blood loss. In this study we sought to determine the effect of calibrated drape markings on blood loss estimation in a simulated vaginal delivery.

METHODS: Subjects were randomized to estimate simulated blood loss (300, 500, 1000, and 2000 mL) in calibrated or noncalibrated vaginal delivery drapes and then crossover.

RESULTS: Visual blood loss estimation with noncalibrated drapes underestimated blood loss, with worsening accuracy at larger volumes (16% error at 300 mL to 41% at 2000 mL). The calibrated drape error was <15% at all volumes.

CONCLUSIONS: Calibrated vaginal delivery drapes improve blood loss estimation.






Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 2007 by the International Anesthesia Research Society.