title: Platelet-induced vasomotion of isolated canine coronary artery in the presence of halothane or isoflurane.
abstract: To determine the effect of 1.5 MAC of two volatile anesthetics (halothane and isoflurane) on platelet-induced contraction of canine coronary artery, isolated, denuded coronary rings were suspended between two stirrups, placed into organ chambers filled with an oxygenated Krebs-Ringer solution, and connected to an isometric force transducer. Human platelets were obtained from healthy donors and introduced into the organ chambers in increasing amounts to reach 20,50 and, 70 x 10(9) platelets/L. The tension generated in both the control and anesthetic-treated rings was recorded; only halothane reduced the tension induced by platelet activation in the organ chambers. In some experiments, aliquots of Krebs-Ringer solution were taken to determine the amount of 5-HT and TB2 released by 70 x 10(9) human platelets in the presence and absence of the anesthetics. Only halothane reduced TA2 production by the activated platelets. Finally, the contractile response of isolated denuded canine coronary artery rings to U46619, a thromboxane analog, was measured in the presence and absence of the anesthetics. Neither halothane nor isoflurane attenuated the response. In another series of experiments, in vitro platelet aggregation was induced by epinephrine, collagen, ADP, or arachidonic acid in the presence or absence of 1.5 MAC isoflurane or halothane. Both anesthetics significantly reduced the aggregation.
authors.affiliation: Department of Anesthesia, University of Montreal, Quebec, Canada.
authors.forename: G A
authors.initials: GA
authors.lastname: Blaise
authors.forename: M
authors.initials: M
authors.lastname: Parent
authors.forename: S
authors.initials: S
authors.lastname: Laurin
authors.forename: A
authors.initials: A
authors.lastname: Omri
authors.forename: T A
authors.initials: TA
authors.lastname: Reader
authors.forename: J M
authors.initials: JM
authors.lastname: Moutquin
mesh_terms: D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D000818:Animals; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D003329:Coronary Vasospasm / Q000503:physiopathology; D003331:Coronary Vessels / Q000187:drug effects*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D006221:Halothane / Q000008:administration & dosage / Q000494:pharmacology*; D006801:Humans; D007530:Isoflurane / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000187:drug effects; D015539:Platelet Activation / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*; D011450:Prostaglandin Endoperoxides, Synthetic / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology*; D012701:Serotonin / Q000032:analysis / Q000378:metabolism; D013928:Thromboxane A2 / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D013929:Thromboxane B2 / Q000032:analysis / Q000378:metabolism; D014661:Vasoconstriction; D014662:Vasoconstrictor Agents / Q000008:administration & dosage / Q000378:metabolism / Q000494:pharmacology*; D014666:Vasomotor System / Q000187:drug effects*
chemical_list: D011450:Prostaglandin Endoperoxides, Synthetic; D014662:Vasoconstrictor Agents; D012701:Serotonin; D013929:Thromboxane B2; D013928:Thromboxane A2; D019796:15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic Acid; D007530:Isoflurane; D006221:Halothane