RT Journal Article SR Electronic T1 Precordial ultrasonic monitoring and pulse oximetry during cesarean delivery JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 57 OP 57 DO 10.1136/rapm-00115550-198813011-00057 VO 13 IS Suppl 1 A1 JV Vartikar A1 MD Johnson A1 S Datta A1 GW Ostheimer YR 1988 UL http://rapm.bmj.com/content/13/Suppl_1/57.abstract AB