All women undergoing cesarean section delivery under spinal anesthesia with neuraxial morphine will be enrolled after filling out an informed consent prior to surgery. Women undergo spinal anesthesia with 10-12 mg heavy bupivicaine, 20 ucg fentanyl and 100 ucg morphine. Phenylepherine drip is used at anesthesiologist's discretion. If not treatment dose of ephedrine or phenylepherine are given as required by blood pressure.