Plasma cyclic guanosine 3′,5′-monophosphate levels: A marker of glutamate-nitric oxide-guanyl cyclase activity?

Authors

  • Thomas Engelhardt, MD, PhD, FRCA
  • Christian Zaarour, MD
  • Mark W. Crawford, MBBS, FRCPC

DOI:

https://doi.org/10.5055/jom.2011.0087

Keywords:

ketamine, remifentanil, cyclic GMP

Abstract

Objectives: Remifentanil-based anesthesia can lead to acute opioid tolerance and/or hyperalgesia. A low-dose intraoperative infusion of the N-methyl-D-aspartate (NMDA) receptor antagonist ketamine did not result in reduced postoperative morphine consumption after remifentanil-based anesthesia in adolescents. This study investigates the potential role of the glutamate-nitric oxide-cyclic guanosine 3′,5′-monophosphate (cyclic GMP) pathway in the failure of low-dose ketamine to prevent remifentanil-induced acute opioid tolerance and/or hyperalgesia.
Design and setting: Prospective, double-blind, placebo-controlled randomized clinical trial at a university teaching hospital.
Patients, participants, and interventions: Thirty-four adolescents receiving remifentanil-based anesthesia for surgical correction of idiopathic scoliosis were randomly assigned to receive either intraoperative ketamine administered as a bolus dose of 0.5 mg/kg in 10 mL of normal saline and a continuous intravenous infusion of 4.0 μg/kg/min or an equal volume of saline.
Main outcome measures: Blood samples were collected before and after the administration of ketamine for analyzing the concentrations of cyclic GMP, ketamine, and norketamine. Blood samples were analyzed using high-performance liquid chromatography and an enzyme immunoassay.
Results: The median (interquartile range) value of the concentration of plasma cyclic GMP decreased from 23.7 (17.4-26.7) to 14.8 (14.0-17.3) nmol/L after ketamine infusion (p < 0.005) and from 23.9 (16.3-29.2) to 16.3 (14.5-18.6) nmol/L after saline infusion (p < 0.005). The median value of the concentration of plasma cyclic GMP at the end of ketamine infusion did not differ significantly when compared with that after saline infusion (p = 0.07). The concentration of plasma cyclic GMP was inversely correlated with the concentration of plasma ketamine (r = −0.61).
Conclusions: This study suggests that the low dose of intraoperative ketamine infused was insufficient to suppress the NMDA receptor pathway. The concentrations of plasma cyclic GMP may serve as an indirect biological marker of ketamine-induced NMDA receptor antagonism.

Author Biographies

Thomas Engelhardt, MD, PhD, FRCA

Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada; Department of Anaesthesia, Royal Aberdeen Children’s Hospital, Foresterhill, Aberdeen, United Kingdom.

Christian Zaarour, MD

Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.

Mark W. Crawford, MBBS, FRCPC

Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.

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Published

11/01/2017

How to Cite

Engelhardt, MD, PhD, FRCA, T., C. Zaarour, MD, and M. W. Crawford, MBBS, FRCPC. “Plasma Cyclic Guanosine 3′,5′-Monophosphate Levels: A Marker of Glutamate-Nitric Oxide-Guanyl Cyclase Activity?”. Journal of Opioid Management, vol. 7, no. 6, Nov. 2017, pp. 462-6, doi:10.5055/jom.2011.0087.