Fentanyl dose for the insertion of Classic Laryngeal Mask Airways in non-paralysed patients induced with propofol 2.5 mg/kg.
The aim of this randomised, controlled trial was to determine the optimum dose of fentanyl in combination with propofol 2.5 mg x kg(-1) when inserting the Classic Laryngeal Mask Airway. Seventy-five ASA I or II patients were randomly assigned to five groups of fentanyl dosage: 0 microg x kg(-1) (placebo), 0.5 microg x kg(-1), 1.0 microg x kg(-1), 1.5 microg x kg(-1) and 2.0 microg x kg(-1). Anaesthesia was induced by first injecting the study drug over 10 seconds. Three minutes after the study drug was injected, propofol (2.5 mg x kg(-1)) was injected over 10 seconds. The Classic Laryngeal Mask Airway was inserted four minutes and 30 seconds after injection of the study drug. Insertion conditions were evaluated using a four-category score. Thirty-nine males and 36 females aged 19 to 59 years were studied. The incidence of prolonged apnoea increased as fentanyl dose increased. We found that there was a high rate of successful first attempt at insertion with 1 microg x kg(-1) and 1.5 microg x kg(-1), 93% and 87% respectively, compared to 87% in the 2.0 microg x kg(-1) group. The 1.0 microg x kg(-1) group also achieved an 80% optimal insertion conditions score of 4, compared to 73% in the 1.5 microg x kg(-1) group and 80% in the 2 microg x kg(-1) group. Therefore we recommend 1.0 microg x kg(-1) as the optimal dose of fentanyl when used in addition to propofol 2.5 mg/kg for the insertion of the Classic Laryngeal Mask Airway.
Tan
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Department of Anaesthesiology, Faculty of Medicine, University Malaya, Lembah Pantai, Kuala Lumpur, Malaysia.
Wang
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D000328:Adult; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D000771:Anesthesia, Intravenous; D018686:Anesthetics, Intravenous; D001049:Apnea / Q000150:complications / Q000503:physiopathology; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D007442:Intubation, Intratracheal / Q000379:methods*; D017214:Laryngeal Masks; D008297:Male; D008875:Middle Aged; D015742:Propofol; D012121:Respiration, Artificial; D015656:Respiratory Mechanics / Q000502:physiology; D016896:Treatment Outcome; D055815:Young Adult
D000701:Analgesics, Opioid; D018686:Anesthetics, Intravenous; D005283:Fentanyl; D015742:Propofol