The purpose of the study is to determine if a medication called phenylephrine, which helps to control blood pressure, is more effective as a continuous intravenous (IV) infusion compared to continuous IV norepinephrine in maintaining blood pressure during a spinal anesthetic for a cesarean delivery. Good blood pressure control has been shown to decrease nausea and vomiting during and after cesarean delivery under spinal anesthesia. For elective cesarean delivery, all participants will receive spinal anesthesia with a local anesthetic and morphine (provides long term pain control after cesarean delivery). This study plans to enroll 80 pregnant research subjects 18 years and above. Patients will be randomly assigned according to a computer generated system to be in one of two groups.
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Number of Rescue Boluses to Maintain SBP
Timeframe: At time of surgery, up to 2 hours
Median Total Rescue Bolus Dose of Ephedrine (mg) to Maintain SBP
Timeframe: At time of surgery, up to 2 hours
Median Total Rescue Bolus Dose of Phenylephrine (mcg) to Maintain SBP
Timeframe: At time of surgery, up to 2 hours