Document Classification

Section Type: METHODS

Text: After i. v. administration of fentanyl, alfentanil, sufentanil, or saline (0. 9 % NaCl) solution, anesthesia was induced with propofol (7 mg/kg 13. 2 mg/lb], i. v.) and maintained for 90 minutes with a continuous infusion of propofol in conjunction with fentanyl (0. 1 microg/kg/min [0. 045 microg/lb/min]), alfentanil (0. 5 microg/kg/min [0. 23 microg/lb/min]), sufentanil (0. 01 microg/kg/min [0. 004 microg/lb/min]), or saline solution (0. 08 mL/kg/min [0. 036 mL/lb/min]).