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The effect of the postmortem interval on the redistribution of drugs: a comparison of mortuary admission and autopsy blood specimens

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Abstract

Postmortem redistribution (PMR) is an accepted toxicological phenomenon that may affect the interpretation of postmortem blood concentrations. The extent of PMR is not well understood for some drugs. This report describes the PMR of selected substances resulting from the analysis of 149 cases comparing blood specimens taken at admission of the deceased to the mortuary and then at autopsy. Blood was collected in preserved tubes containing 1 % sodium fluoride/potassium oxalate. All cases were subject to a full autopsy and blood extracts were analyzed using a targeted screen by LC–MS/MS. 30 drug or drug metabolites that were detected with an incidence of 6 or more were included in this study. The pre-autopsy interval ranged from 0.5 to 164 h (6.4 days) with an average of 64 h for the cases analyzed. The increase in drug concentration from mortuary admission to autopsy ranged from 30 % for drugs such as citalopram, mirtazapine, and sertraline to 300 % for doxylamine. Only 7 drugs of the 30 studied showed increases of greater than 20 % when comparing autopsy to mortuary admission blood irrespective of the length of the postmortem interval. Drugs including methadone, EDDP, fluoxetine, mirtazapine, and sertraline all showed statistically significant increases during the pre-autopsy interval (p < 0.05) while 6-acetylmorphine, 9-hydroxy-risperidone, and caffeine showed significant decreases (p < 0.05) from mortuary admission to autopsy. While femoral blood is thought to reduce PMR, this data shows that for some drugs significant redistribution can occur even when taking peripheral specimens irrespective of the delay in the postmortem interval.

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Authors and Affiliations

  1. Victorian Institute of Forensic Medicine, 57-83 Kavanagh St, Southbank, 3006, Australia

    Dimitri Gerostamoulos, Jochen Beyer, Voula Staikos, Penny Tayler, Noel Woodford & Olaf H. Drummer

  2. Department of Forensic Medicine, Monash University, 57-83 Kavanagh St, Southbank, 3006, Australia

    Dimitri Gerostamoulos, Jochen Beyer & Olaf H. Drummer

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  1. Dimitri Gerostamoulos
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  2. Jochen Beyer
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  3. Voula Staikos
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  4. Penny Tayler
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  6. Olaf H. Drummer
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Correspondence to Dimitri Gerostamoulos.

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Gerostamoulos, D., Beyer, J., Staikos, V. et al. The effect of the postmortem interval on the redistribution of drugs: a comparison of mortuary admission and autopsy blood specimens. Forensic Sci Med Pathol 8, 373–379 (2012). https://doi.org/10.1007/s12024-012-9341-2

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