Study: NCT01006863

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Ephedrine
Description: Subjects were allocated randomly to five groups by drawing sequentially numbered sealed opaque envelopes containing a computer-generated randomization code. The subjects received intravenous injection of 0.1 mL/kg of a study solution containing either saline 0.9% solution \[group 1 (n=30)\], ephedrine 0.7 mg/mL \[group 2 (n=30)\], ephedrine 1 mg/mL \[group 3 (n=30)\] or ephedrine 1.5 mg/mL \[group 4 (n=30)\]or phenylephrine 15 mcg/mL \[group 5 (n=30)\]. All study solutions were injected over 1 min at 1 min before induction of anesthesia. The placebo and the ephedrine solutions were prepared in identical syringes labeled 'study drug' by the local pharmacy department before induction of anesthesia.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Ephedrine
Description: Subjects were allocated randomly to five groups by drawing sequentially numbered sealed opaque envelopes containing a computer-generated randomization code. The subjects received intravenous injection of 0.1 mL/kg of a study solution containing either saline 0.9% solution \[group 1 (n=30)\], ephedrine 0.7 mg/mL \[group 2 (n=30)\], ephedrine 1 mg/mL \[group 3 (n=30)\] or ephedrine 1.5 mg/mL \[group 4 (n=30)\]or phenylephrine 15 mcg/mL \[group 5 (n=30)\]. All study solutions were injected over 1 min at 1 min before induction of anesthesia. The placebo and the ephedrine solutions were prepared in identical syringes labeled 'study drug' by the local pharmacy department before induction of anesthesia.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Ephedrine
Description: Subjects were allocated randomly to five groups by drawing sequentially numbered sealed opaque envelopes containing a computer-generated randomization code. The subjects received intravenous injection of 0.1 mL/kg of a study solution containing either saline 0.9% solution \[group 1 (n=30)\], ephedrine 0.7 mg/mL \[group 2 (n=30)\], ephedrine 1 mg/mL \[group 3 (n=30)\] or ephedrine 1.5 mg/mL \[group 4 (n=30)\]or phenylephrine 15 mcg/mL \[group 5 (n=30)\]. All study solutions were injected over 1 min at 1 min before induction of anesthesia. The placebo and the ephedrine solutions were prepared in identical syringes labeled 'study drug' by the local pharmacy department before induction of anesthesia.

Intervention type: DRUG
Group type: PLACEBO_COMPARATOR
Intervention: Placebo
Description: Subjects were allocated randomly to five groups by drawing sequentially numbered sealed opaque envelopes containing a computer-generated randomization code. The subjects received intravenous injection of 0.1 mL/kg of a study solution containing either saline 0.9% solution \[group 1 (n=30)\], ephedrine 0.7 mg/mL \[group 2 (n=30)\], ephedrine 1 mg/mL \[group 3 (n=30)\] or ephedrine 1.5 mg/mL \[group 4 (n=30)\]or phenylephrine 15 mcg/mL \[group 5 (n=30)\]. All study solutions were injected over 1 min at 1 min before induction of anesthesia. The placebo and the ephedrine solutions were prepared in identical syringes labeled 'study drug' by the local pharmacy department before induction of anesthesia.

Intervention type: DRUG
Group type: ACTIVE_COMPARATOR
Intervention: Phenylephrine
Description: Subjects were allocated randomly to five groups by drawing sequentially numbered sealed opaque envelopes containing a computer-generated randomization code. The subjects received intravenous injection of 0.1 mL/kg of a study solution containing 15 mcg/ml of phenylephrine \[group 5 (n=30)\] All study solutions were injected over 1 min at 1 min before induction of anesthesia. The placebo, the ephedrine, and the phenylephrine solutions were prepared in identical syringes labeled 'study drug' by the local pharmacy department before induction of anesthesia.