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Anesth Analg 2002;94:4-10
© 2002 International Anesthesia Research Society

CARDIOVASCULAR ANESTHESIA

The Rewarming Rate and Increased Peak Temperature Alter Neurocognitive Outcome After Cardiac Surgery

Alina M. Grigore, MD*, Hilary P. Grocott, MD FRCP*, Joseph P. Mathew, MD*, Barbara Phillips-Bute, PhD*, Timothy O. Stanley, MD*, Aimee Butler, MS*, Kevin P. Landolfo, MD{dagger}, Joseph G. Reves, MD*, James A. Blumenthal, PhD{ddagger}, and Mark F. Newman, MD* the Neurologic Outcome Research Group of the Duke Heart Center

Departments of *Anesthesiology, {dagger}Surgery, and {ddagger}Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina

Address correspondence to Joseph P. Mathew, MD, and reprint requests to Mark F. Newman, MD, Division of Cardiothoracic Anesthesiology, Box 3094, Duke University Medical Center, Durham, NC 27710. Address e-mail to mathe014{at}mc.duke.edu

Neurocognitive dysfunction is a common complication after cardiac surgery. We evaluated in this prospective study the effect of rewarming rate on neurocognitive outcome after hypothermic cardiopulmonary bypass (CPB). After IRB approval and informed consent, 165 coronary artery bypass graft surgery patients were studied. Patients received similar surgical and anesthetic management until rewarming from hypothermic (28°–32°C) CPB. Group 1 (control; n = 100) was warmed in a conventional manner (4°–6°C gradient between nasopharyngeal and CPB perfusate temperature) whereas Group 2 (slow rewarm; n = 65) was warmed at a slower rate, maintaining no more than 2°C difference between nasopharyngeal and CPB perfusate temperature. Neurocognitive function was assessed at baseline and 6 wk after coronary artery bypass graft surgery. Univariable analysis revealed no significant differences between the Control and Slow Rewarming groups in the stroke rate. Multivariable linear regression analysis, examining treatment group, diabetes, baseline cognitive function, and cross-clamp time revealed a significant association between change in cognitive function and rate of rewarming (P = 0.05).

IMPLICATIONS: Slower rewarming during cardiopulmonary bypass (CPB) was associated with better cognitive performance at 6 wk. These results suggest that a slower rewarming rate with lower peak temperatures during CPB may be an important factor in the prevention of neurocognitive decline after hypothermic CPB.




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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 © 2002 by the International Anesthesia Research Society.