Hypophosphatemia in Critically Ill Children: Risk Factors, Outcome and Mechanism

Satish Kumar Shah1, Mohammad Irshad2, Nandita Gupta3

  • 1Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, 110029, India.

Insights

Hypophosphatemia is common in critically ill children, affecting over 70%. This condition is linked to longer pediatric intensive care unit stays but not increased mortality.

Area of Science:

  • Pediatric Critical Care Medicine
  • Pediatric Nephrology
  • Clinical Chemistry

Background:

  • Hypophosphatemia is a frequent electrolyte disturbance in critically ill children.
  • Understanding its prevalence, risk factors, and impact on outcomes is crucial for pediatric intensive care.

Purpose of the Study:

  • To determine the prevalence of hypophosphatemia in critically ill children.
  • To investigate its association with clinical outcomes, risk factors, and mechanisms.

Main Methods:

  • Serum phosphate levels, phosphate intake, and renal phosphate handling indices were measured in pediatric intensive care unit patients.
  • Hypophosphatemia was defined based on age-specific serum phosphorus thresholds.
  • Renal phosphate loss was assessed using the tubular maximum reabsorption of phosphate to glomerular filtration rate ratio (TmP/GFR).

Main Results:

  • The prevalence of hypophosphatemia was 71.6% in critically ill children.
  • Hypophosphatemia was significantly associated with prolonged pediatric intensive care unit length of stay (PICU LOS > 6 days).
  • No significant association was found between hypophosphatemia and increased mortality; however, renal phosphate loss was increased.

Conclusions:

  • Hypophosphatemia is highly prevalent in critically ill children.
  • Increased urinary phosphate excretion is a key mechanism contributing to hypophosphatemia in this population.
  • Hypophosphatemia is associated with prolonged PICU LOS.
Abstract

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