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Anesth Analg 1977; 56:395-397
© 1977 International Anesthesia Research Society
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Response Time of the Narkotest® Anesthetic Gas Monitor

JOSE L. VELAZQUEZ, MD*, ALFRED FEINGOLD, MS, MD{dagger}, and PATRICK WALTHER, BS{ddagger}

*Research Trainee, Department of Anesthesiology, University of Miami School of Medicine and Veterans Administration Hospital, Miami, Florida 33152. {dagger}Associate Professor, Department of Anesthesiology, University of Miami School of Medicine and Veterans Administration Hospital, Miami, Florida 33152. {ddagger}Research Assistant, Department of Anesthesiology, University of Miami School of Medicine and Veterans Administration Hospital, Miami, Florida 33152.

Abstract

Response time (RT) of the Narkotest® anesthetic gas monitor was measured for 7 inhalation anesthetics, using a 5 L/min fresh gas flow (FGF). Time to 63 percent of maximum response (RT63) and to 95 percent of maximum response (RT95) was directly related to rubber/ gas and oil/gas partition coefficients. RT95 ranged from 7 seconds for N2O to 843 seconds for methoxyflurane. RT measured at 0.5 L/min FGF was markedly prolonged over RT at 5 L/min.

When the Narkotest was placed on the expiratory limbs of circle-absorber breathing circuits, the difference between the calibrated Narkotest reading (Fn) and the mixed expired circuit concentration (Fe) was shown to depend on the rate of increase of the circuit concentration.






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 © 1977 by the International Anesthesia Research Society.