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Related Experiment Videos

Lower anion gap increases sensitivity in predicting elevated lactate.

R N Singh1, N C Singh, J Hutchison

  • 1Department of Pediatric Intensive Care, Children's Hospital of Eastern Ontario, Ottawa, Canada.

Clinical Intensive Care : International Journal of Critical & Coronary Care Medicine
|December 9, 1993
PubMed
Summary
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A new upper limit of 11 mmol/l for the anion gap (AG) improves detection of elevated lactate in critically ill children, offering higher sensitivity and negative predictive value. This revised AG threshold aids in identifying critical conditions more effectively.

Area of Science:

  • Clinical Chemistry
  • Paediatric Critical Care
  • Biomarker Discovery

Background:

  • The established upper limit of normal for the anion gap (AG) is being re-evaluated for its efficacy in clinical settings.
  • Lowering the AG upper limit has shown promise in identifying elevated lactate levels in adult intensive care populations.
  • Accurate prediction of elevated lactate is crucial for managing critically ill children.

Purpose of the Study:

  • To establish a new, evidence-based upper limit of normal for the anion gap in healthy adults.
  • To assess the diagnostic performance (sensitivity, specificity, predictive values) of the new AG upper limit for detecting elevated lactate in critically ill children, comparing it to the traditional threshold.
  • To explore the relationship between AG and lactate levels in paediatric intensive care unit (PICU) patients.

Related Experiment Videos

Main Methods:

  • A prospective cohort study involving healthy adult volunteers and critically ill children in a Paediatric Intensive Care Unit.
  • Anion gap calculated using the formula: AG = Na - (Cl + HCO3).
  • Comparison of a newly derived AG upper limit (11 mmol/l) against the conventional limit (16 mmol/l) for predicting elevated lactate.

Main Results:

  • A new upper limit of normal for the anion gap was determined to be 11 mmol/l based on healthy adult volunteers.
  • Using an AG of 11 mmol/l in critically ill children yielded a sensitivity of 86% and specificity of 40% for elevated lactate, compared to 49% sensitivity and 84% specificity for an AG of 16 mmol/l.
  • Receiver-operating-characteristic (ROC) curve analysis supported the utility of the lower AG threshold, and a linear correlation between AG and lactate levels was observed.

Conclusions:

  • The revised upper limit of normal for the anion gap (11 mmol/l) demonstrates superior sensitivity and negative predictive value in identifying elevated lactate in critically ill children.
  • While the new threshold enhances detection rates, it comes at the cost of reduced specificity and positive predictive value compared to the traditional AG limit of 16 mmol/l.
  • The findings suggest that a lower anion gap threshold may be a more effective screening tool for hyperlactatemia in paediatric intensive care settings.