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Divergence Between Net Fluid and Weight-Based Evaluation in Calculating Cumulative Fluid Balance.

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Fluid balance calculations in critically ill children differ, with intake/output methods consistently higher than weight-based methods. This discrepancy widens over time, especially in neonates, highlighting the need for careful interpretation of fluid balance in pediatric intensive care units.

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Area of Science:

  • Pediatric critical care medicine
  • Clinical fluid management
  • Intensive care unit (ICU) research

Background:

  • Standardizing fluid balance calculations in the ICU remains a challenge.
  • Understanding the relationship between different fluid balance calculation methods is limited.
  • Accurate fluid balance is crucial for managing critically ill patients.

Purpose of the Study:

  • To quantify the agreement between cumulative fluid balance calculated from fluid intake and output (CFBf) and from serial weights (CFBw).
  • To analyze these differences in critically ill children during their first week of ICU admission.
  • To identify potential discrepancies in fluid balance assessment methods.

Main Methods:

  • Retrospective, multicenter, federated observational study across six pediatric ICUs.
  • Analysis of 8,895 pediatric patients representing 12,388 ICU encounters.
  • Bland-Altman analyses to assess agreement between CFBf and CFBw, stratified by ICU day and patient subgroups.

Main Results:

  • Cumulative fluid balance from fluid intake/output (CFBf) consistently exceeded cumulative fluid balance from weights (CFBw) across all subgroups.
  • The mean difference between CFBf and CFBw increased significantly over time (days 0-3: 2.7% vs. days 4-7: 8.1%).
  • Greater divergence was observed in neonates and patients with early anchor weights.

Conclusions:

  • CFBf consistently overestimates fluid balance compared to CFBw, with increasing divergence during the ICU stay.
  • Clinicians must recognize these method-specific differences and prioritize frequent patient weights.
  • Future research should correlate fluid balance methods with patient outcomes to determine the most clinically relevant approach.