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Arterio-venous plasma concentration differences in amitriptyline overdose.

F J Baud, A Buisine, C Bismuth

    Journal of Toxicology. Clinical Toxicology
    |January 1, 1985
    PubMed
    Summary
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    Femoral arterio-venous plasma concentration differences (AVD) of amitriptyline were significantly different in intoxicated patients. This highlights the importance of specifying blood sample origin in toxicological studies for accurate amitriptyline analysis.

    Area of Science:

    • Pharmacology
    • Clinical Toxicology

    Background:

    • Amitriptyline is a commonly prescribed antidepressant.
    • Acute intoxication can lead to significant physiological changes.
    • Accurate plasma concentration measurements are crucial for patient management.

    Purpose of the Study:

    • To investigate the presence of arterio-venous plasma concentration differences (AVD) of amitriptyline in patients experiencing acute intoxication.
    • To determine if the origin of blood samples (arterial vs. venous) impacts amitriptyline concentration measurements.

    Main Methods:

    • Patients with acute amitriptyline intoxication were recruited.
    • Blood samples were drawn simultaneously from the femoral artery and vein in the study group.
    • A control group had serial samples drawn from the same vessel.

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  • Plasma amitriptyline concentrations were quantified using gas liquid chromatography.
  • Statistical analysis was performed using the Wilcoxon matched pairs test.

    • Main Results:

    • No significant arterio-venous plasma concentration differences (AVD) were observed in the control group.
    • A statistically significant difference in amitriptyline AVD was found in the study group of intoxicated patients.
    • These findings indicate a measurable difference in amitriptyline levels between arterial and venous blood during intoxication.

    Conclusions:

    • The origin of blood samples (arterial or venous) is a critical factor to consider in toxicological studies involving amitriptyline.
    • Arterio-venous differences in plasma concentration should be accounted for when interpreting amitriptyline levels in acute intoxication.
    • Standardization of blood sampling procedures is recommended for consistent and reliable toxicological results.