Protocol of remifentanil for the 2 study periods
| Period 1 (n = 5) | Period 2 (n = 9) | |
| Site of administration | Intravenously | Intravenously |
| Period of administration | In 30 seconds | In 30 seconds |
| Starting dose | 1 µg/kg | 2 µg/kg |
| Repeated doses | Dose 2: 1 µg/kg Dose 3: 1 µg/kg | Dose 2: 3 µg/kg Dose 3: 4 µg/kg Dose 4: 5 µg/kg |
| Sedative in case of failure | Propofol 1–2 mg/kg | Propofol 1–2 mg/kg |