title: M-Entropy guidance vs standard practice during propofol-remifentanil anaesthesia: a randomised controlled trial.
abstract: Seventy-two patients undergoing routine surgical procedures under propofol-remifentanil anaesthesia were randomly assigned to receive either standard clinical practice (n = 35) or standard practice plus monitoring of depth of anaesthesia with M-Entropy (n = 37). Patients in the standard practice group received more propofol than the entropy group (mean (SD) 95 (14) vs 81 (22) microg.kg(-1).min(-1), respectively; p < 0.01), and less remifentanil (0.39 (0.08) vs 0.46 (0.08) microg.kg(-1).min(-1), respectively; p < 0.001). Loss of consciousness was best predicted by BIS (prediction probability (P(K)) 0.96) and response entropy (P(K) 0.93), whereas emergence was best predicted by response entropy (P(K) 0.94). The frequency of unwanted patient responses was higher in the standard practice group than in the entropy group (47 vs 27 total events, respectively; p < 0.01). Both regimens resulted in fast recovery with no clinical advantage for either one. There were no significant differences in haemodynamic parameters, postoperative nausea and vomiting or satisfaction with the procedure.
authors.affiliation: Department of Anaesthesiology and Intensive Care Medicine, University Hospital Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany. gruenewald@anaesthesie.uni-kiel.de
authors.forename: M
authors.initials: M
authors.lastname: Gruenewald
authors.forename: J
authors.initials: J
authors.lastname: Zhou
authors.forename: N
authors.initials: N
authors.lastname: Schloemerkemper
authors.forename: P
authors.initials: P
authors.lastname: Meybohm
authors.forename: N
authors.initials: N
authors.lastname: Weiler
authors.forename: P H
authors.initials: PH
authors.lastname: Tonner
authors.forename: J
authors.initials: J
authors.lastname: Scholz
authors.forename: B
authors.initials: B
authors.lastname: Bein
mesh_terms: D000328:Adult; D000762:Anesthesia Recovery Period; D000771:Anesthesia, Intravenous / Q000379:methods; D019162:Anesthetics, Combined / Q000008:administration & dosage*; D018686:Anesthetics, Intravenous / Q000008:administration & dosage*; D001364:Awareness / Q000187:drug effects; D004334:Drug Administration Schedule; D004569:Electroencephalography / Q000187:drug effects; D019277:Entropy; D005260:Female; D006801:Humans; D010535:Laparoscopy; D008875:Middle Aged; D016343:Monitoring, Intraoperative / Q000379:methods*; D010880:Piperidines / Q000008:administration & dosage*; D015742:Propofol / Q000008:administration & dosage*; D000077208:Remifentanil; D012815:Signal Processing, Computer-Assisted
chemical_list: D019162:Anesthetics, Combined; D018686:Anesthetics, Intravenous; D010880:Piperidines; D000077208:Remifentanil; D015742:Propofol