Suitable dose of fentanyl for laryngeal mask airway insertion during propofol-fentanyl anesthesia

Objective To investigate a suitable dose of fentanyl for laryngeal mask airway(LMA)insertion during propofol-fentanyl anesthesia.Methods Forty-five patients,scheduled for minor procedures were randomized into three groups with 15 cases each.Anesthesia was induced with propofol 2.5 mg/kg,which was combined with fentanyl 0.5 μg/kg(group F0.5),1.0 μg/kg(group F1.0),or 1.5 μg/kg(group F1.5),respectively.The time of LMA insertion,recovery of autonaomous respiration after LMA insertion and the condition of LMA insertion were recorded.Heart rate,blood pressure,oxygen saturation,respiration rate and PETCO2 after recovery of autonaomous respiration were measured.Results The condition of LMA insertion in group F1.0 and group F1.5 was better than that in group F0.5.The recovery time of autonamous respiration was longer in group F1.5 than that in group F0.5 and group F1.0.Conclusion Indcution of anesthesia with propofol 2.5 mg/kg and fentanyl 1.0 μg/kg may provide better conditions for LMA insertion and retain better autonomous respiration.