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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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Synthetic and semisynthetic opioids are pivotal in pain management and tackling opioid addiction. Semisynthetic opioids, including morphinans (morphine derivatives), oxycodone, oxymorphone, hydrocodone, and hydromorphone, have improved pharmacokinetic profiles compared to morphine. Additionally, heroin and 6-MAM (6-Monoacetylmorphine) show better CNS penetration than morphine due to heightened lipid solubility. Hydromorphone, a potent opioid, undergoes hepatic metabolism to form the active...
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Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
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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.     
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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not...
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Analysis of Methadone-Related Poisoning Cases.

Ze-Qi Li1, Lei Xing1, Hui-Ge Zhang1

  • 1Department of Clinical Medicine, The First Clinical School of Medicine, Zhengzhou University, Zhengzhou 450001, China.

Fa Yi Xue Za Zhi
|August 14, 2025
PubMed
Summary

Methadone poisoning cases, particularly those involving combined substances, are common in China and Italy. Forensic identification of methadone deaths relies on characteristic symptoms like coma and respiratory depression.

Keywords:
analysis of death causecases analysisforensic pathologyforensic toxicologymethadonepoisoning

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Area of Science:

  • Forensic Toxicology
  • Clinical Toxicology
  • Public Health

Background:

  • Methadone is a synthetic opioid used for pain management and opioid addiction treatment.
  • Methadone overdose can lead to severe poisoning and death.
  • Understanding the characteristics of methadone-related poisoning is crucial for forensic identification.

Purpose of the Study:

  • To analyze the epidemiological and toxicological characteristics of methadone-related poisoning cases.
  • To provide a reference for forensic identification of methadone-related deaths.
  • To compare poisoning patterns in China and Italy.

Main Methods:

  • Retrospective analysis of 71 methadone poisoning cases in China (1998-2023) and 26 methadone-related deaths in Italy (2013-2018).
  • Data retrieval from PubMed, Wanfang, and CNKI databases.
  • Analysis of general information, forensic pathological, and toxicological data.

Main Results:

  • In China, 76.06% of poisoning cases did not result in death; 23.94% were fatal. Most cases involved males aged 19-39. Poisoning by methadone alone and combined with other substances were comparable (49.30% vs 45.07%).
  • Common symptoms included coma, respiratory depression, and miosis; autopsy often revealed signs of asphyxia. Blood methadone concentrations in deceased ranged from 0.112 to 3.000 mg/L.
  • In Italy, 84.62% of deaths were male. Combined substance use was higher (76.92%) than methadone alone (23.08%). Blood methadone concentrations ranged from 0.181 to 4.059 mg/L.

Conclusions:

  • Methadone poisoning patterns, especially the comparable incidence of single versus combined substance use, are observed in both China and Italy.
  • The clinical triad of coma, respiratory depression, and miosis is indicative of methadone poisoning and aids forensic experts in determining cause of death.
  • Routine testing for methadone and co-intoxicants in deceased individuals is recommended to improve data interpretation for forensic cases.