RT Journal Article SR Electronic T1 Unresponsive postoperative patient JF Practical Neurology JO Pract Neurol FD BMJ Publishing Group Ltd SP 559 OP 560 DO 10.1136/practneurol-2020-002812 VO 21 IS 6 A1 Keng Lam A1 Navdeep Sangha YR 2021 UL http://pn.bmj.com/content/21/6/559.abstract AB