Fluids and body composition during anesthesia in children and adolescents: A pilot study

Area of Science:

• Pediatric Anesthesiology
• Fluid Physiology
• Bioimpedance Spectroscopy

Background:

• Children undergoing surgery often receive routine intravenous fluids.
• Bioimpedance spectroscopy (BCM) is validated for assessing fluid status in children.
• BCM is used in nephrology to manage fluid overload.

Purpose of the Study:

• To evaluate changes in intracellular and extracellular fluid volumes before and after anesthesia.
• To determine if these volume changes can optimize intraoperative fluid administration.
• To assess fluid status variations in children undergoing low-risk procedures.

Main Methods:

• Used a body composition monitor (BCM) to measure fluid volumes.
• Measurements were taken before and after general anesthesia in healthy children and adolescents.
• 100 participants aged 7.0 (4.8-11) years were included.

Main Results:

• Total body water increased by 182 mL/m² and extracellular water by 169 mL/m² perioperatively.
• Fluid volume changes correlated with administered fluid amounts.
• Intracellular water content showed no significant change.

Conclusions:

• Routine intraoperative fluid administration leads to significant fluid accumulation in low-risk children.
• Children without major health issues may not require perioperative IV fluids if clear fluids are allowed pre-anesthesia.
• BCM measurements show potential for guiding intraoperative fluid therapy in future studies.