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.
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Equipment; laryngeal mask airway;
Document Type: Research Article
Lecturer, Department of Anaesthesiology, Kansai Medical University Hospital, 10-15 Fumizono-cho, Moriguchi, Osaka, 570-8507, Japan
Publication date: December 1, 1999