Patients scheduled for cesarean delivery arrive in the birthing centre 1-2 The patients will be given the same anesthetic care routinely used in the birthing centre, except that we will control the time that the patient remains seated after injection of intrathecal hyperbaric bupivacaine. The baseline blood pressure and heart rate will be recorded. After intravenous access is obtained, an infusion of normal saline will be commenced at a rate of 100 cc per hour. The patient will be brought to the operating room, and the standard monitors will be placed. The intravenous fluid will be administered at a rate of 500 ml per hour for one hour. The patient will be placed in a sitting position. The landmarks of the spinal canal will be identified with an ultrasound, then using sterile technique, an epidural catheter will be placed in the L2-L3 spinal interspace, and then a 27 gauge whitacre needle will be used to access the intrathecal space at the L4-L5 spinal interspace. After identification of the intrathecal space, hyperbaric bupivacaine will be injected over 30 seconds. The patient will then be left in the sitting position for the predetermined time. The patient will then be placed supine, with a 15 degree wedge under the right hip. The noninvasive blood pressure will be set to measure the blood pressure every minute. Hypotension will be defined as a drop in blood pressure to more than 20% of the patient's preoperative blood pressure. The medications used for treatment of hypotension will be left to the discretion of the treating anesthesiologist. The height of the anesthetic blockade will be measured bilaterally with ice at 1, 5, 10, 15, and 20 minutes after the patient has been placed supine. If the block has not reached T6 by 20 minutes after the patient has assumed the supine position, or if the patient experiences any pain during the cesarean delivery, 5 ml of 2% lidocaine will be administered through the epidural catheter. If this does not suitably manage the pain, the treating anesthesiologist will be allowed to manage the pain as they see fit.