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Anesth Analg 2005;101:524-534
© 2005 International Anesthesia Research Society
doi: 10.1213/01.ANE.0000160585.43587.5B

NEUROSURGICAL ANESTHESIA

Revising a Dogma: Ketamine for Patients with Neurological Injury?

Sabine Himmelseher, MD*, and Marcel E. Durieux, MD, PhD{dagger}

*Klinik fuer Anaesthesiologie, Klinikum rechts der Isar, Technische Universität, München, Germany; and {dagger}Department of Anesthesiology, University of Virginia Health System, Charlottesville, Virginia

Address correspondence and reprint requests to Marcel E. Durieux, MD, PhD, Department of Anesthesiology, University of Virginia Health System, PO Box 800710, Charlottesville, VA 22908-0710. Address e-mail to durieux{at}virginia.edu.

We evaluated reports of randomized clinical trials in the perioperative and intensive care setting concerning ketamine’s effects on the brain in patients with, or at risk for, neurological injury. We also reviewed other studies in humans on the drug’s effects on the brain, and reports that examined ketamine in experimental brain injury. In the clinical setting, level II evidence indicates that ketamine does not increase intracranial pressure when used under conditions of controlled ventilation, coadministration of a {gamma}-aminobutyric acid (GABA) receptor agonist, and without nitrous oxide. Ketamine may thus safely be used in neurologically impaired patients. Compared with other anesthetics or sedatives, level II and III evidence indicates that hemodynamic stimulation induced by ketamine may improve cerebral perfusion; this could make the drug a preferred choice in sedative regimes after brain injury. In the laboratory, ketamine has neuroprotective, and S(+)-ketamine additional neuroregenerative effects, even when administered after onset of a cerebral insult. However, improved outcomes were only reported in studies with brief recovery observation intervals. In developing animals, and in certain brain areas of adult rats without cerebral injury, neurotoxic effects were noted after large-dose ketamine. These were prevented by coadministration of GABA receptor agonists.




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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 © 2005 by the International Anesthesia Research Society.