[The anion gap--screening for hyperlactatemia in critically ill children?]

Area of Science:

• Pediatric Critical Care Medicine
• Clinical Chemistry
• Biochemical Markers

Context:

• Serum lactate is a key indicator of tissue perfusion in critically ill patients.
• Hyperlactatemia is a common concern in pediatric intensive care units (PICUs).
• Early detection of hyperlactatemia is crucial for timely intervention.

Purpose:

• To evaluate the effectiveness of the anion gap as a screening method for detecting hyperlactatemia in a PICU setting.
• To assess the sensitivity and specificity of the anion gap in identifying elevated lactate levels in infants and children.
• To determine if the anion gap's performance varies across different age groups and diagnoses.

Summary:

• This study assessed the anion gap's utility in screening for hyperlactatemia in pediatric patients.
• Blood gases, electrolytes, and lactate levels were measured in infants and children.
• The anion gap showed increasing sensitivity with rising hyperlactatemia, with an overall sensitivity of 64% and specificity of 76% across all age groups.

Impact:

• The anion gap provides a fair, though imperfect, screening method for hyperlactatemia in pediatric critical care.
• Results suggest that hyperlactatemia should be considered in the differential diagnosis of non-anion gap metabolic acidosis.
• This highlights the importance of comprehensive diagnostic approaches in critically ill children.