Time course of potentiation of vecuronium by sevoflurane and isoflurane / 中华麻醉学杂志

ABSTRACT

To observe the time-dependent course of potentiation of vecuronium produced by 1MAC of end-tidal sevoflurane and isoflurane. Method: At the beginning, a steady infusion rate of vecuronium to maintain 90 of neuromuscular block was established in 40 patient undergoing neurosurgical procedures under propofol fentanyl nitrous oxide oxygen anesthesia. The patients were randomly assigned to receiving IMAC end-tidal concentration of either sevoflurane (Group Sev) or isoflurane(Group Iso). Vecuronium infusion rate was adjusted to maintain 90%, neuromuscular block. The change of infusion rate of vecuronium with time was observed after inhalation of Sev or Iso. Result: Sev and Iso decreased the infusion dosage of vecuronium in an exponential manner, maximal potentiation occurred 90 min after inhalation. Maximal reduction in infusion rate was 67.87% in group Sev and 69.87% in group Iso without the significant difference between them. Conclusion: Sev and Iso can potentate the muscular relaxation of vecuronium at similar degree in strong time-dependent way.