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Related Concept Videos

Antidotes01:17

Antidotes

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Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
Specific antidotes operate by inhibiting the enzymes that control biochemical pathways, reducing the production of harmful metabolites.
An example of an antidote is atropine, which counteracts the detrimental effects of cholinesterase inhibitors. It achieves this by deactivating muscarinic receptors,...
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Anticholinesterase Agents: Poisoning and Treatment01:26

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Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is...
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Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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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.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
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Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

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In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
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Types of Toxins01:36

Types of Toxins

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
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Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

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Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
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Related Experiment Video

Updated: Oct 1, 2025

Inducing Acute Liver Injury in Rats via Carbon Tetrachloride CCl4 Exposure Through an Orogastric Tube
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Thiocyanate toxicity: a teaching case.

C James Watson1,2, Daniel L Overbeek3, Gabriella Allegri-Machado4

  • 1Harvard Medical Toxicology Program, Boston Children's Hospital, Boston, MA, USA.

Clinical Toxicology (Philadelphia, Pa.)
|March 4, 2022
PubMed
Summary
This summary is machine-generated.

Acute thiocyanate toxicity can cause severe cardiac and neurologic symptoms. This case highlights supportive care, including lipid emulsion therapy (LET), as effective, with hemodialysis reserved for severe poisoning.

Keywords:
(MeSH): Cyanatesdrug overdosemedical laboratory sciencepharmacokinetics

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Area of Science:

  • Toxicology
  • Clinical Medicine

Background:

  • Thiocyanate is known to cause gastrointestinal, neurologic, and cardiovascular toxicity.
  • It can also interfere with various laboratory assays, leading to inaccurate results.

Observation:

  • A 17-year-old female presented with acute thiocyanate toxicity following intentional ingestion.
  • She experienced delirium, wide complex tachycardia, and seizure activity with metabolic derangements.
  • Laboratory results showed hyperchloremia, hypocalcemia, hypokalemia, and falsely elevated salicylate levels.

Findings:

  • The patient recovered with supportive care, including lipid emulsion therapy (LET), without requiring hemodialysis.
  • Thiocyanate elimination followed first-order kinetics with a half-life of 61.6 hours.
  • Laboratory abnormalities were attributed to thiocyanate interference with analytical methodologies.

Implications:

  • Thiocyanate poisoning requires careful monitoring for cardiac and neurologic effects.
  • Lipid emulsion therapy (LET) may be beneficial due to thiocyanate's lipophilicity.
  • Supportive management is key, with hemodialysis considered for severe cases; further research on LET and cyanide antidotes is warranted.