Sensitivity of dose-estimations for acute acetaminophen overdose in predicting hepatotoxicity risk using the...

Area of Science:

• Toxicology
• Emergency Medicine
• Pharmacology

Background:

• Acetaminophen overdose management is challenging in resource-limited areas due to delayed concentration assessments.
• The 150 mg/kg dose-estimate is a common criterion for overdose, but its accuracy against nomogram treatment lines needs evaluation.
• Evaluating diagnostic accuracy of dose-estimates versus serum concentrations is crucial for timely intervention.

Purpose of the Study:

• To assess the sensitivity and specificity of acetaminophen dose-estimates (150 mg/kg, 200 mg/kg) against the Rumack-Matthew Nomogram's 150 mg/L treatment line.
• To compare medical care costs associated with different overdose assessment strategies.
• To determine the utility of the 150 mg/kg dose-estimate in resource-poor settings for initiating N-acetylcysteine therapy.

Main Methods:

• Retrospective chart review of 784 acute acetaminophen overdose cases.
• Analysis of serum acetaminophen levels plotted against the 150 mg/L treatment line on the Rumack-Matthew Nomogram.
• Evaluation of sensitivity, specificity, and occurrence of hepatotoxicity and acute liver injury (ALI) based on dose-estimates.

Main Results:

• The 150 mg/kg dose-estimate showed 92.6% sensitivity and 55.3% specificity for the 150 mg/L treatment line.
• Hepatotoxicity occurred in 7.3% and ALI in 23.9% of cases.
• Patients with dose-estimates below 150 mg/kg had no hepatotoxicity and 7.1% developed ALI. Activated charcoal reduced risk by half.

Conclusions:

• The 150 mg/kg dose-estimate is a satisfactory standalone criterion for initiating N-acetylcysteine in resource-poor settings.
• Combining the 150 mg/kg estimate with activated charcoal and 24-hour aminotransferase monitoring is a practical management strategy.
• This approach aids timely intervention and potentially reduces healthcare costs in underserved areas.