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Updated: May 3, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Morphine concentrations in skeletal muscle.

Veronica M Hargrove1, D Kimberley Molina

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Skeletal muscle can detect morphine, but its concentration doesn't reliably predict blood levels in forensic toxicology. This study found significant disparities, limiting quantitative analysis in muscle tissue.

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Area of Science:

  • Forensic Toxicology
  • Postmortem Analysis
  • Pharmacokinetics

Background:

  • Skeletal muscle is a large body component, offering a potential alternative specimen for drug testing when blood is unavailable.
  • Morphine, a common opiate in postmortem toxicology, exhibits stable concentrations in peripheral blood.

Purpose of the Study:

  • To compare morphine concentrations in femoral blood and skeletal muscle.
  • To evaluate the stability and predictability of skeletal muscle as a specimen for morphine quantitation in forensic toxicology.

Main Methods:

  • Morphine concentrations were measured in both femoral blood and thigh skeletal muscle samples.
  • Statistical analysis was performed to assess the correlation between blood and muscle concentrations.

Main Results:

  • Skeletal muscle proved to be a sensitive matrix for detecting morphine.
  • A significant disparity was observed between morphine concentrations in skeletal muscle and femoral blood.
  • The study found a lack of predictability in skeletal muscle morphine concentrations compared to blood levels.

Conclusions:

  • Thigh skeletal muscle can be utilized for the qualitative identification of morphine in postmortem cases.
  • Quantitative interpretation of morphine results from skeletal muscle should be approached with caution due to poor correlation with blood concentrations.