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Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
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Postmortem toxicology.

Gisela Skopp1

  • 1Institute of Legal Medicine, University Hospital, Voss-Str. 2, 69115 Heidelberg, Germany. gisela.skopp@med.uni-heidelberg.de

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Summary
This summary is machine-generated.

Toxicological analyses in death investigations are crucial for determining drug involvement. Postmortem changes and limited case information can complicate drug identification and interpretation.

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Area of Science:

  • Forensic Toxicology
  • Analytical Chemistry

Background:

  • Toxicological analyses are vital in death investigations to ascertain the role of foreign substances.
  • Drug concentrations can fluctuate due to various pre-terminal factors, including altered pharmacokinetics and medical interventions.
  • Postmortem changes, such as degradation and formation of new drug entities, can significantly impact results, especially in putrefied remains.

Purpose of the Study:

  • To highlight the complexities and challenges in toxicological analyses during death investigations.
  • To emphasize the importance of considering pre- and postmortem factors that influence drug concentrations.
  • To underscore the need for proper specimen selection, quality assurance, and comprehensive case information for accurate interpretation.

Main Methods:

  • Review of toxicological principles and analytical challenges in death investigations.
  • Discussion of factors affecting drug concentrations in biological samples.
  • Emphasis on quality assurance in toxicological testing.

Main Results:

  • Drug concentrations are subject to change due to physiological and environmental factors.
  • Postmortem degradation and synthesis of drugs can occur, complicating analysis.
  • Inadequate case history and specimen issues often limit the interpretation of toxicological findings.

Conclusions:

  • Accurate toxicological interpretation requires careful consideration of pre- and postmortem changes.
  • Robust quality assurance and appropriate specimen selection are essential for reliable results.
  • Comprehensive case information is critical for understanding the significance of toxicological findings in death investigations.