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Published on: May 2, 2017
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.
Objectives:
To determine the prevalence of hypophosphatemia in critically ill children and its association with clinical outcomes; to determine risk factors and mechanism of hypophosphatemia.
Methods:
Levels of serum phosphate, phosphate intake, renal phosphate handling indices and blood gases were measured on days 1, 3, 7 and 10 of pediatric intensive care unit (PICU) stay. Hypophosphatemia was defined as any serum phosphorus <3.8 mg/dl for children younger than 2 y and <3.5 mg/dl for children 2 y or older. Renal phosphate loss was assessed using the ratio of tubular maximum reabsorption of phosphate (TmP) to glomerular filtration rate (GFR) [TmP/GFR].
Results:
Prevalence of hypophosphatemia was 71.6 % (95 % CI: 64.6-78.6). On adjusted analysis, hypophosphatemia was associated with prolonged PICU length of stay (PICU LOS > 6 d) (adjusted OR: 3.0 [95 % CI: 1.4-6.7; p = 0.005]) but not associated with increased mortality. Renal phosphate threshold was significantly lower on all the days in hypophosphatemic group compared to that of non-hypophosphatemic group. No statistically significant difference in the amount of phosphate intake was seen in both the groups.
Conclusions:
Hypophosphatemia is highly prevalent in critically ill children and is associated with prolonged PICU LOS. Increased phosphate loss in urine is one of the mechanism responsible for hypophosphatemia in critically ill children.
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