Pharmacokinetic and pharmacodynamic interactions in anaesthesia

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Pharmacokinetic and pharmacodynamic interactions in anaesthesia Pharmacokinetic and pharmacodynamic interactions in anaesthesia. A review of current knowledge and how it can be used to optimize anaesthetic drug administration  J.P. van den Berg, H.E.M. Vereecke, J.H. Proost, D.J. Eleveld, J.K.G. Wietasch, A.R. Absalom, M.M.R.F. Struys  British Journal of Anaesthesia  Volume 118, Issue 1, Pages 44-57 (January 2017) DOI: 10.1093/bja/aew312 Copyright © 2017 The Author(s) Terms and Conditions

Fig 1 Schematic diagram of the pharmacokinetic and pharmacodynamic interaction between hypnotics and analgesics. Note that this scenario is also valid for any other combination of two drugs that interact. PD, pharmacodynamic; PK, pharmacokinetic. Modified (with permission) from Sahinovic and colleagues.1 British Journal of Anaesthesia 2017 118, 44-57DOI: (10.1093/bja/aew312) Copyright © 2017 The Author(s) Terms and Conditions

Fig 2 Simulated induction of anaesthesia with a bolus of propofol and maintenance with sevoflurane combined with a remifentanil target-controlled infusion in a 35-yr-old male subject (weight 70 kg, height 175 cm). Induction starts with a remifentanil infusion targeting effect-site concentrations of 1.5, 3, or 5 ng ml−1, respectively. A propofol bolus of 1.5 (a, c, and e) or 2.5 mg kg−1 (b, d, and f) is given 2 min after the start of the remifentanil infusion. To maintain a probability of tolerance to laryngoscopy (PTOL) of 90% (pharmacodynamic end point), sevoflurane has to be started 1, 3, and 4 min after the smaller propofol bolus (a, c, and e, respectively) or 3.3, 4.5, and 5.6 min after the larger propofol bolus (b, d, and f, respectively). Note the pharmacodynamic interaction as the PTOL is maintained in steady-state remifentanil infusion during changing plasma concentrations of two different hypnotics (i.e. propofol and sevoflurane). Used with permission from Hannivoort and colleagues, previously published as a web supplement.35 British Journal of Anaesthesia 2017 118, 44-57DOI: (10.1093/bja/aew312) Copyright © 2017 The Author(s) Terms and Conditions

Fig 3 Description of additivity, supra-additivity, and infra-additivity. Each line represents an equipotent effect resulting from different drug combinations (a+b). In the event of additivity, the combined effect equals the expected effect by simple addition. This is usually the case when two drugs, acting via the same physiological pathways, are combined together. For supra- and infra-additivity (usually drugs that work via different pathways), the combined effect is greater or smaller than expected by simple addition (usually when two drugs compete with each other on the same receptor), respectively. Supra- and infra-additivity are also termed synergistic and antagonistic, respectively, in the literature. British Journal of Anaesthesia 2017 118, 44-57DOI: (10.1093/bja/aew312) Copyright © 2017 The Author(s) Terms and Conditions

Fig 4 Response surface model for probability of tolerance to laryngoscopy (right graph) and bispectral index (BIS; left graph) for sevoflurane and remifentanil. This three-dimensional model describes the interaction effect of any drug combinations within the ranges. Please note that the sevoflurane concentration axis shows ascending concentrations from 0 to 4 for the probability of tolerance to laryngoscopy and descending concentrations from 4 to 0 for the BIS. From the source data, filled dots represent the patients tolerant to laryngoscopy, whereas open dots represent the responsive patients. The bold black line drawn through the three-dimensional model represents the 90% isobole to illustrate that the model also represents an infinite amount of isoboles. For BIS, the dotted line represent all equipotent combinations to reach BIS=40, whereas the continuous black line represents combinations to reach BIS=60. British Journal of Anaesthesia 2017 118, 44-57DOI: (10.1093/bja/aew312) Copyright © 2017 The Author(s) Terms and Conditions

Fig 5 The top panel shows SmartPilot® View (Dräger, Lubeck, Germany). This specific screenshot shows anaesthesia based on sevoflurane, propofol, remifentanil, and pancuronium. The graph on the left provides retro- and prospective information about the drug interaction between hypnotic and analgesic drugs. It provides predictive information regarding the following minutes from ‘now’. This screen introduces the noxious stimulation response index (NSRI; right) as a new parameter. It also provides past and predictive information of BIS over time. (Printed with permission, ©Dräger Medical GmbH, Lübeck, Germany). The bottom panel shows the Navigator™ Application Suite (GE Healthcare, Helsinki, Finland). This display provides a diagram and modelling tool for common volatile and i.v. anaesthetic drugs (in this example, propofol, sevoflurane, remifentanil, and rocuronium). It calculates effect-site concentrations and displays these in a time-based graphical format. The total effect line (black line) shows the combined effect of the analgesic and sedative drugs. The display calculates the models for up to 1 h into the future. (Printed with permission, ©General Electric Company, Helsinki, Finland). British Journal of Anaesthesia 2017 118, 44-57DOI: (10.1093/bja/aew312) Copyright © 2017 The Author(s) Terms and Conditions