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British Journal of Anaesthesia, 2003, Vol. 90, No. 6 759-765
© 2003 The Board of Management and Trustees of the British Journal of Anaesthesia

Laboratory Investigations

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

O. Langeron1, B. Bouhemad1, G. Orliaguet2, P. Coriat1, Y. Lecarpentier3 and B. Riou1,4

1 Department of Anaesthesiology and Critical Care, Centre Hospitalier Universitaire (CHU) Pitié-Salpêtrière, Assistance Publique-Hôpitaux de Paris (AP-HP), Université Pierre et Marie Curie, Paris, France. 2 Department of Anaesthesiology and Critical Care, CHU Necker-Enfants malades, AP-HP, Université René Descartes, Paris, France. 3 Department of Physiology, CHU Bicêtre, AP-HP, Université Paris Sud, Le Kremlin-Bicêtre, Paris, France. 4 Service d’Accueil des Urgences, CHU Pitié-Salpêtrière, AP-HP, Université Pierre et Marie Curie, Paris, France

Corresponding author. E-mail: olivier.langeron@psl.ap-hop-paris.fr

Background. 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.

Methods. 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°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.

Results. 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.

Conclusion. In the rat diaphragm at therapeutic concentrations, halogenated anaesthetics do not significantly modify CB mechanical and kinetic properties.

Br J Anaesth 2003; 90: 759–65


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