title: In vitro effects of desflurane, sevoflurane, isoflurane, and halothane in isolated human right atria.
abstract: BACKGROUND
  Direct myocardial effects of volatile anesthetics have been studied in various animal species in vitro. This study evaluated the effects of equianesthetic concentrations of desflurane, sevoflurane, isoflurane, and halothane on contractile parameters of isolated human atria in vitro.
  
  
  METHODS
  Human right atrial trabeculae, obtained from patients undergoing coronary bypass surgery, were studied in an oxygenated (95% O2-5% CO2) Tyrode's modified solution ([Ca2+]o = 2.0 mM, 30 degrees C, stimulation frequency 0.5 Hz). The effects of equianesthetic concentrations (0.5, 1, 1.5, 2, and 2.5 minimum alveolar concentration [MAC]) of desflurane, sevoflurane, isoflurane, and halothane on inotropic and lusitropic parameters of isometric twitches were measured.
  
  
  RESULTS
  Isoflurane, sevoflurane, and desflurane induced a moderate concentration-dependent decrease in active isometric force, which was significantly lower than that induced by halothane. In the presence of adrenoceptor blockade, the desflurane-induced decrease in peak of the positive force derivative and time to peak force became comparable to those induced by isoflurane. Halothane induced a concentration-dependent decrease in time to half-relaxation and a contraction-relaxation coupling parameter significantly greater than those induced by isoflurane, sevoflurane and desflurane.
  
  
  CONCLUSIONS
  In isolated human atrial myocardium, desflurane, sevoflurane, and isoflurane induced a moderate concentration-dependent negative inotropic effect. The effect of desflurane on time to peak force and peak of the positive force derivative could be related to intramyocardial catecholamine release. At clinically relevant concentrations, desflurane, sevoflurane, and isoflurane did not modify isometric relaxation.
authors.affiliation: Département d'Anesthésie-Réanimation, Centre Hospitalier Universitaire, Caen, France. hanouz-jl@chu-caen.fr
authors.forename: J L
authors.initials: JL
authors.lastname: Hanouz
authors.forename: M
authors.initials: M
authors.lastname: Massetti
authors.forename: G
authors.initials: G
authors.lastname: Guesne
authors.forename: S
authors.initials: S
authors.lastname: Chanel
authors.forename: G
authors.initials: G
authors.lastname: Babatasi
authors.forename: R
authors.initials: R
authors.lastname: Rouet
authors.forename: P
authors.initials: P
authors.lastname: Ducouret
authors.forename: A
authors.initials: A
authors.lastname: Khayat
authors.forename: F
authors.initials: F
authors.lastname: Galateau
authors.forename: H
authors.initials: H
authors.lastname: Bricard
authors.forename: J L
authors.initials: JL
authors.lastname: Gérard
mesh_terms: D000368:Aged; D018685:Anesthetics, Inhalation / Q000494:pharmacology*; D002395:Catecholamines / Q000378:metabolism; D000077335:Desflurane; D006221:Halothane / Q000494:pharmacology; D006325:Heart Atria / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D006846:Hydrocarbons, Halogenated / Q000494:pharmacology; D007530:Isoflurane / Q000031:analogs & derivatives / Q000494:pharmacology; D008738:Methyl Ethers / Q000494:pharmacology; D008875:Middle Aged; D009200:Myocardial Contraction / Q000187:drug effects; D000077149:Sevoflurane
chemical_list: D018685:Anesthetics, Inhalation; D002395:Catecholamines; D006846:Hydrocarbons, Halogenated; D008738:Methyl Ethers; D000077149:Sevoflurane; D000077335:Desflurane; D007530:Isoflurane; D006221:Halothane