RT Journal Article SR Electronic T1 The Importance of Monitoring Inspired Oxygen Concentrations During Regional Anesthesia JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 126 OP 127 DO 10.1136/rapm-00115550-198813030-00007 VO 13 IS 3 A1 Leland H. Hanowell A1 Jeffrey Kanefield YR 1988 UL http://rapm.bmj.com/content/13/3/126.abstract AB The mass spectrometer detected interruption of fresh gas supply for supplemental oxygen administration during regional anesthesia. Conventional monitoring of inspired oxygen concentration would not have permitted recognition of the disconnection described.