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Drug Concentrations: Measurements01:23

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Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
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The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
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Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion.
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Postmortem Quetiapine Reference Concentrations in Brain and Blood.

Louise Skov1, Sys Stybe Johansen2, Kristian Linnet2

  • 1Section of Forensic Chemistry, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V's Vej 11, DK-2100 Copenhagen Ø, Denmark louise.skov@sund.ku.dk.

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This study establishes reference concentrations for quetiapine in postmortem brain tissue, finding levels approximately four times higher than in blood. These findings aid forensic investigations when blood samples are unavailable.

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Area of Science:

  • Forensic Toxicology
  • Neuropharmacology
  • Postmortem Investigations

Background:

  • Brain tissue analysis offers an alternative to blood in postmortem forensic investigations.
  • Limited data on reference concentrations in brain tissue complicates interpretation of drug levels.
  • Quetiapine, an antipsychotic, requires established reference ranges for accurate postmortem assessment.

Purpose of the Study:

  • To quantify quetiapine concentrations in postmortem brain tissue and compare them to blood levels.
  • To establish reference ranges for non-toxic quetiapine concentrations in brain tissue.
  • To identify concentration ranges indicative of quetiapine toxicity in postmortem cases.

Main Methods:

  • Quantification of quetiapine in brain tissue and postmortem blood samples from 43 cases.
  • Analysis of cases categorized by quetiapine's relation to the cause of death (unrelated, contributing, sole cause).
  • Calculation of brain-to-blood concentration ratios for different toxicity levels.

Main Results:

  • For cases where quetiapine was unrelated to death, median brain concentration was 0.48 mg/kg and median blood concentration was 0.15 mg/kg (brain-blood ratio: 3.87).
  • In cases where quetiapine contributed to death, median brain concentration was 8.02 mg/kg, over 15 times higher than non-toxic levels.
  • A single overdose case showed a brain concentration of 25.74 mg/kg, with a brain-blood ratio of 2.86.

Conclusions:

  • Postmortem brain quetiapine concentrations are, on average, about four times higher than blood concentrations.
  • Established reference ranges for non-toxic quetiapine brain concentrations can aid forensic interpretation.
  • Significantly elevated brain concentrations indicate potential toxicity and contribution to death.