Central Arterial Pressure Changes With Use of Regional Anesthesia in Obstetric Patients

Subjects will be screened as they are admitted to the maternity care floor (5th floor St. Mary's Hospital). Subjects will be approached if they are desiring regional anesthesia. The subject will have an additional blood pressure cuff placed on the arm that anesthesia is not using for their blood pressure cuff. Central arterial pressure will be measured from the cuff: * Prior to regional anesthesia placement * Every 15 minutes for 1 hour * Every 30 minutes for 2 hours Routine sphygmomanometer measurements will also completed at the above times. These are all study procedures. Anesthesia will use their usual protocol for blood pressure monitoring and management during placement of, and after the procedure. No changes in patient management will be made based upon the central arterial pressure as the guidelines were developed with routine brachial pressure.