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Paracetamol poisoning: which nomogram should we use?

Duncan Reid1, Wayne Hazell

  • 1Emergency Department, North Shore Hospital, Shakespeare Rd, Private Bag 93503, Takapuna, New Zealand. Duncan.Reid@WaitemataDHB.govt.nz

Emergency Medicine (Fremantle, W.A.)
|March 3, 2004
PubMed
Summary

Practice varies in Australasian emergency departments regarding paracetamol nomograms. Most use a 1300 mumol/L treatment level, but some use lower thresholds, despite evidence of hepatotoxicity below 1300 mumol/L.

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Area of Science:

  • Emergency Medicine
  • Clinical Toxicology

Background:

  • Paracetamol (acetaminophen) overdose is a common cause of acute liver injury.
  • Nomograms are crucial tools for guiding N-acetylcysteine treatment in paracetamol poisoning.
  • Current guidelines and practices for paracetamol nomogram use in Australasia require evaluation.

Purpose of the Study:

  • To determine the types of paracetamol nomograms currently utilized in Australasian Emergency Departments (EDs).
  • To review the existing scientific literature for the evidence base supporting current paracetamol nomogram guidelines.

Main Methods:

  • A cross-sectional descriptive study was conducted using a postal survey of all Australasian EDs accredited for specialist emergency medicine training.
  • A comprehensive literature review was performed utilizing the Knowledge Finder search engine.

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Main Results:

  • The study achieved an 87% response rate from Australasian EDs.
  • The most frequently adopted nomogram featured a four-hour treatment threshold of 1300 mumol/L (used by 69% of respondents).
  • Significant variation exists, with 22% using a 1000 mumol/L threshold, 3% treating above 660 mumol/L, and 15% lacking a treatment line below 1300 mumol/L.

Conclusions:

  • There is considerable variability in paracetamol nomogram use across Australasian EDs.
  • Literature indicates that hepatotoxicity and fatalities can occur in patients with paracetamol levels below the 1300 mumol/L threshold.
  • N-acetylcysteine remains a highly safe and effective antidote when administered at recommended dosages.