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Anesth Analg 2005;101:978-985
© 2005 International Anesthesia Research Society
doi: 10.1213/01.ane.0000171231.29328.9f

PEDIATRIC ANESTHESIA

A Comparison of Radial Artery Blood Pressure Determination Between the Vasotrac Device and Invasive Arterial Blood Pressure Monitoring in Adolescents Undergoing Scoliosis Surgery

Mary E. McCann, MD*, David Hill, MBBS{dagger}, Kristin C. Thomas, MS, RN{ddagger}, David Zurakowski, PhD§, and Peter C. Laussen, MBBS*{ddagger}

*Department of Anesthesiology, Perioperative and Pain Medicine, Children’s Hospital, Harvard Medical School; {dagger}Department of Anaesthesiology, Royal Children’s Hospital, University of Queensland School of Medicine; {ddagger}Department of Cardiology, §Department of Orthopaedic Surgery, Children’s Hospital, Harvard Medical School

Address correspondence and reprint requests to Mary Ellen McCann, MD, 300 Longwood Ave, Boston, MA 02115. Address e-mail to mary.mccann{at}childrens.harvard.edu.

The Vasotrac device (Medwave, Arden Hills, MN) allows noninvasive measurement of arterial blood pressure (BP) and arterial waveform. We have previously demonstrated agreement between the Vasotrac and continuous intraarterial BP monitoring in children with a stable circulation after cardiac surgery in the cardiac intensive care unit. To assess this monitor during different physiologic conditions, we studied the Vasotrac in anesthetized adolescent children undergoing scoliosis surgery in the prone position, with or without controlled hypotension. Eleven children undergoing surgery for idiopathic scoliosis were enrolled in this study. The anesthetic consisted of primarily a nitrous oxide and narcotic technique with controlled hypotension obtained using IV labetalol. Data were analyzed using correlations, mean error, and Bland-Altman plots. Noninvasive BP measured by the Vasotrac correlated closely with intraarterial BP. Waveforms displayed by the two systems were qualitatively similar. Correlation between the two methods for systolic, diastolic and mean BP was r = 0.82, r = 0.83, and r = 0.90, respectively. We conclude that noninvasive BP measurement using the Vasotrac monitor enables near-continuous and reliable monitoring of BP during anesthesia in the prone position and pharmacologic-induced hypotension.






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 © 2005 by the International Anesthesia Research Society.