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Morphine metabolism after major liver surgery.

Asa Rudin1, Johan F Lundberg, Margareta Hammarlund-Udenaes

  • 1Department of Anesthesiology and Intensive Care, Lund University Hospital, Lund, Sweden. asa.rudin@skane.se

Anesthesia and Analgesia
|May 22, 2007
PubMed
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Liver resection increases plasma morphine concentrations, leading to higher sedation. Caution is advised when administering morphine to liver resection patients due to impaired morphine metabolism.

Area of Science:

  • Pharmacology
  • Hepatology
  • Anesthesiology

Background:

  • Impaired morphine metabolism can increase sedation and respiratory depression.
  • Liver function significantly impacts drug metabolism, including opioids.

Purpose of the Study:

  • To investigate morphine pharmacokinetics in patients post-liver resection compared to a control group.
  • To assess the impact of liver resection on morphine metabolism and associated side effects.

Main Methods:

  • Compared morphine pharmacokinetics in 15 liver resection patients versus 15 colon resection controls.
  • Measured plasma concentrations of morphine and its metabolites (M6G, M3G).
  • Assessed pain, respiratory rate, and sedation scores post-administration via patient-controlled analgesia.

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Main Results:

  • Higher plasma morphine concentrations observed in liver resection patients, indicating reduced metabolism.
  • Sedation incidence was higher in the liver resection group, but respiratory depression did not differ.
  • Morphine requirements and pain scores were similar between groups.

Conclusions:

  • Liver resection leads to increased plasma morphine concentrations and sedation.
  • Morphine metabolism is impaired following liver resection.
  • Clinical caution is recommended when prescribing morphine to patients who have undergone liver resection.