The effect of fentanyl and remifentanil on human circulation under general anesthesia

INTERVENTION: Intervention type:DRUG. Intervention1:remifentanil, Dose form:INJECTION, Route of administration:INTRAVENOUS DRIP. Control intervention1:fentanyl, Dose form:INJECTION, Route of administration:INTRAVENOUS DRIP. CONDITION: Scheduled surgical patients for general anesthesia, who are ASA PS I‐II, intubation, supine position. Exclusion cases; BMI>30, Age>70, Base line HR<50, Base line SBP>180 PRIMARY OUTCOME: Percent decrease from baseline of SBP, DBP, MBP, and HR. Timepoint:25 minutes from the start of anesthesia. SECONDARY OUTCOME: Number of treatments of phenylephrine, atropine, and other treatments. Timepoint: 25 minutes from the start of anesthesia. INCLUSION CRITERIA: Scheduled surgical patients for general anesthesia, who are ASA PS I‐II, intubation, supine position.