PMID: 12765892May 27, 2003Paper

Effects of halogenated anaesthetics on diaphragmatic actin-myosin cross-bridge kinetics

British Journal of Anaesthesia
Olivier LangeronB Riou

Abstract

The effects of halogenated anaesthetics on cross-bridge (CB) kinetics are unclear. As halogenated anaesthetics do not markedly modify the intracellular calcium transient in the diaphragm, we used an isolated rat diaphragm preparation to assess the effects of halothane and isoflurane on CB kinetics. The effects of halothane and isoflurane (1 and 2 minimum alveolar concentration (MAC)) on rat diaphragm muscle strips were studied in vitro (Krebs-Henseleit solution, 29 degrees C, oxygen 95%/carbon dioxide 5%) in tetanus mode (50 Hz). From the force-velocity curve and using A. F. Huxley's equations, we determined the main mechanical and energetic variables and calculated CB kinetics. At 1 and 2 MAC, isoflurane and halothane induced no significant inotropic effects. Whatever the concentrations tested, halothane and isoflurane did not significantly modify the CB number, the elementary force per CB, the attachment and detachment constants, the duration of the CB cycle and mean CB velocity. In the rat diaphragm at therapeutic concentrations, halogenated anaesthetics do not significantly modify CB mechanical and kinetic properties.

References

Jan 1, 1974·Anesthesiology·M D Sokoll
Dec 8, 1994·Nature·J A Spudich
Jul 22, 1999·The European Respiratory Journal·Y LecarpentierJ J Mercadier
Jan 16, 2002·American Journal of Respiratory and Critical Care Medicine·Catherine CoiraultYves Lecarpentier
Feb 14, 2002·Journal of Applied Physiology·Gilles OrliaguetBruno Riou
Jan 14, 1964·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·A V HILL

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