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Published on: June 6, 2011

Hypotonic versus isotonic maintenance fluids after surgery for children: a randomized controlled trial

Karen Choong1, Steve Arora, Ji Cheng

  • 1Department of Pediatrics, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada. choongk@mcmaster.ca

Pediatrics
|October 19, 2011
PubMed

Insights

Isotonic parenteral maintenance solutions (PMS) are safer than hypotonic PMS for children after surgery. Isotonic solutions significantly reduce the risk of hyponatremia, a dangerous drop in sodium levels.

Area of Science:

  • Pediatric critical care
  • Clinical trials
  • Fluid management

Background:

  • Postoperative hyponatremia is a significant concern in pediatric patients.
  • Parenteral maintenance solutions (PMS) are commonly used for fluid management in these patients.
  • The choice between isotonic and hypotonic solutions may impact electrolyte balance.

Purpose of the Study:

  • To compare the risk of hyponatremia in pediatric surgical patients receiving isotonic (0.9% saline) versus hypotonic (0.45% saline) PMS.
  • To evaluate secondary outcomes including severe hyponatremia, hypernatremia, and adverse events.

Main Methods:

  • A randomized controlled trial involving 258 pediatric surgical patients (6 months to 16 years).
  • Patients received either isotonic or hypotonic PMS for 48 hours.
  • Primary outcome was acute hyponatremia; secondary outcomes included severe hyponatremia and hypernatremia.

Main Results:

  • Hypotonic PMS significantly increased the risk of hyponatremia compared to isotonic PMS (40.8% vs 22.7%).
  • Isotonic PMS did not increase the risk of hypernatremia.
  • No significant differences in antidiuretic hormone levels or adverse events were observed between groups.

Conclusions:

  • Isotonic PMS is significantly safer than hypotonic PMS for preventing acute postoperative hyponatremia in children.
  • This finding supports the use of isotonic solutions for maintenance fluid therapy in pediatric surgical patients.
Abstract

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