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Acetaminophen hepatotoxicity: An update.

C J McClain1, S Price, S Barve

  • 1Division of Digestive Diseases and Nutrition, University of Kentucky Medical Center, 800 Rose Street, Lexington, KY 40536-0084, USA.

Current Gastroenterology Reports
|September 12, 2000
PubMed
Summary
This summary is machine-generated.

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Acetaminophen overdose can cause severe liver damage due to a toxic metabolite. Early N-acetylcysteine treatment is crucial for preventing liver failure, especially in susceptible individuals.

Area of Science:

  • Hepatology
  • Toxicology
  • Pharmacology

Background:

  • Acetaminophen is a common analgesic and antipyretic.
  • It can cause dose-related hepatotoxicity, leading to liver failure.
  • Susceptibility is increased in individuals consuming alcohol or fasting.

Purpose of the Study:

  • To elucidate the mechanism of acetaminophen-induced liver injury.
  • To identify risk factors and prognostic indicators.
  • To emphasize the importance of early intervention with N-acetylcysteine.

Main Methods:

  • Review of existing literature on acetaminophen metabolism and toxicity.
  • Analysis of clinical presentation and outcomes of acetaminophen overdose.
  • Discussion of the role of cytochrome P-450, glutathione, and cytokines.

Related Experiment Videos

Main Results:

  • Acetaminophen is metabolized to a toxic intermediate, N-acetyl-p-benzoquinine imine.
  • Glutathione depletion allows the metabolite to bind to liver cells, causing necrosis.
  • Alcohol consumption and fasting can deplete glutathione and induce P-450 2E1, increasing risk.
  • High AST/ALT levels, prolonged prothrombin time, renal dysfunction, and acidosis are indicators of severe injury.

Conclusions:

  • Acetaminophen hepatotoxicity results from a toxic metabolite overwhelming normal detoxification pathways.
  • Early administration of N-acetylcysteine is a highly effective antidote.
  • Increased awareness and prompt treatment are vital for managing acetaminophen overdose and preventing liver failure.