title: The in vitro effects of isoflurane, sevoflurane, and propofol on platelet aggregation.
abstract: We studied the in vitro effects of sevoflurane, isoflurane, and propofol anesthesia on platelet function. Thirty patients undergoing minor surgical procedures were divided into three groups (n = 10 each). Induction of anesthesia was achieved by using 5 mg/kg thiopental i.v., and 0.1 mg/kg vecuronium i.v. was used for muscle relaxation. Anesthesia maintenance was provided by sevoflurane in the first, isoflurane in the second, and propofol infusion in the third group with 70% N2O in O2. Hemoglobin, hematocrit, thrombocyte count, prothrombin time, activated partial thromboplastin time, international normalized ratio, arterial pH, von Willebrand factor, viscosity, platelet aggregation, and bleeding time were measured 1 h pre-, intra-, and postanesthesia. There was no difference among the platelet aggregation ratios of the pre-, intra-, and postoperative periods in the isoflurane group. The aggregation ratios in the sevoflurane and propofol groups were significantly reduced at intraoperative periods compared with preoperative values. Diminished aggregation values were also found 1 h postoperatively compared with the control values in the sevoflurane and propofol groups. We conclude that, in patients with a bleeding tendency during the intra- and early postoperative period, isoflurane may be preferred as a general anesthetic.
  
  
  CONCLUSIONS
  In our study, using vacuum-operated tubes, we demonstrated that sevoflurane and propofol had a significant inhibitory effect on intraoperative and early postoperative platelet aggregation, whereas isoflurane had no effect. Therefore, isoflurane may be preferred as a general anesthetic in patients with a clinically relevant bleeding tendency.
authors.affiliation: Department of Anesthesia, Medical Faculty of Marmara University, Istanbul, Turkey.
authors.forename: I V
authors.initials: IV
authors.lastname: Doğan
authors.forename: E
authors.initials: E
authors.lastname: Ovali
authors.forename: Z
authors.initials: Z
authors.lastname: Eti
authors.forename: A
authors.initials: A
authors.lastname: Yayci
authors.forename: F Y
authors.initials: FY
authors.lastname: Göğüş
mesh_terms: D000328:Adult; D018685:Anesthetics, Inhalation / Q000008:administration & dosage / Q000494:pharmacology*; D018686:Anesthetics, Intravenous / Q000008:administration & dosage / Q000494:pharmacology*; D001777:Blood Coagulation / Q000187:drug effects; D001809:Blood Viscosity / Q000187:drug effects; D005260:Female; D005500:Follow-Up Studies; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D019934:International Normalized Ratio; D007530:Isoflurane / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D008738:Methyl Ethers / Q000008:administration & dosage / Q000494:pharmacology*; D008875:Middle Aged; D003473:Neuromuscular Nondepolarizing Agents / Q000008:administration & dosage; D009569:Nitric Oxide / Q000008:administration & dosage; D010100:Oxygen / Q000008:administration & dosage; D010314:Partial Thromboplastin Time; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000494:pharmacology; D010976:Platelet Count / Q000187:drug effects; D015742:Propofol / Q000008:administration & dosage / Q000494:pharmacology*; D011517:Prothrombin Time; D000077149:Sevoflurane; D013874:Thiopental / Q000008:administration & dosage; D014673:Vecuronium Bromide / Q000008:administration & dosage; D014841:von Willebrand Factor / Q000032:analysis