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Effect of anesthetic structure on inhalation anesthesia: implications for the mechanism.

Abstract
Many previous attempts (e.g., the Meyer-Overton hypothesis) to provide a single set of physical or chemical characteristics that accurately predict anesthetic potency have failed. A finding of a general predictive correlation would support the notion of a unitary theory of narcosis. Using the Abraham solvation parameter model, the minimum alveolar concentration, MAC, of 148 varied anesthetic agents can be fitted to a linear equation in log (1/MAC) with R(2) = 0.985 and a standard deviation, SD = 0.192 log units. Division of the 148 compounds into a training set and a test set shows that log (1/MAC) values can be predicted with no bias and with SD = 0.20 log units. The two main factors that determine MAC values are compound size and compound hydrogen bond acidity, both of which increase anesthetic activity. Shape has little or no effect on anesthetic activity. Our observations support a unitary theory of narcosis by inhalation anesthetics. A two-stage mechanism for inhalation anesthesia accounts for the observed structural effects of anesthetics. In this mechanism, the first main step is transfer of the anesthetic to the site of action, and the second step is interaction of the anesthetic with a receptor(s).
AuthorsMichael H Abraham, William E Acree Jr, Christina Mintz, Stacy Payne
JournalJournal of pharmaceutical sciences (J Pharm Sci) Vol. 97 Issue 6 Pg. 2373-84 (Jun 2008) ISSN: 0022-3549 [Print] United States
PMID17847069 (Publication Type: Comparative Study, Journal Article)
Copyright2007 Wiley-Liss, Inc
Chemical References
  • Anesthetics, Inhalation
Topics
  • Anesthesia, Inhalation
  • Anesthetics, Inhalation (chemistry, pharmacology)
  • Animals
  • Consciousness (drug effects)
  • Dose-Response Relationship, Drug
  • Hydrogen Bonding
  • Models, Biological
  • Models, Chemical
  • Molecular Structure
  • Particle Size
  • Rats
  • Structure-Activity Relationship

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