Information that will be obtained during the study will include any decrease in blood pressure or increase in heart rate at the time the saline or oxytocin is given directly into the vein. The obstetrician will be asked to indicate how well the uterus is contracting and they can ask the anesthesiologist to give more oxytocin or a more powerful drug if, in their opinion, the uterus is not contracting well. This is the normal way that this is done.