Electroencephalographic arousal response during tracheal intubation and laryngeal mask airway insertion after induction of anaesthesia with propofol.
Laryngoscopy and tracheal intubation, or insertion of a laryngeal mask airway may lead to an arousal response on the electroencephalogram. We studied whether more intense stimulation (laryngoscopy and tracheal intubation) causes a greater arousal response than less intense stimulation (laryngeal mask airway insertion). Thirty-four patients (ASA I-II) were anaesthetised with propofol 3 mg.kg-1, followed by vecuronium 0.15 mg.kg-1 and a propofol infusion of 10 mg.kg-1.h-1. Three minutes after induction of anaesthesia, either laryngoscopy and tracheal intubation (n = 18), or laryngeal mask airway insertion (n = 16) was performed. Laryngoscopy and tracheal intubation caused a significantly greater increase in blood pressure (but not heart rate) than laryngeal mask airway insertion (p < 0.05). Electroencephalogram responses were not different. More intense stimulation does not cause a greater arousal response during propofol anaesthesia.
Inada
T
T
Department of Anaesthesiology, Kansai Medical University Hospital, Osaka, Japan.
Shingu
K
K
Nakao
S
S
Hirose
T
T
Nagata
A
A
D000328:Adult; D000368:Aged; D018686:Anesthetics, Intravenous / Q000494:pharmacology*; D001143:Arousal / Q000187:drug effects; D001794:Blood Pressure; D004569:Electroencephalography / Q000187:drug effects; D005260:Female; D006339:Heart Rate; D006801:Humans; D007442:Intubation, Intratracheal; D017214:Laryngeal Masks; D007828:Laryngoscopy; D008297:Male; D008875:Middle Aged; D015742:Propofol / Q000494:pharmacology*
D018686:Anesthetics, Intravenous; D015742:Propofol