Subjects were monitored with electrocardiography, non-invasive blood pressure, pulse oximetry (SpO2), and end-tidal carbon dioxide concentration (EtCO2). After pre-oxygenation for 5 min, rapid-sequence induction was performed with propofol 1.5-2 mg/kg followed by suxamethonium 1.5 mg/kg after loss of verbal response. Cricoid pressure was applied after loss of consciousness and was released after correct placement of the tracheal tube had been confirmed.