A rational approach to perioperative fluid management

Area of Science:

• Anesthesiology
• Perioperative Medicine
• Fluid Physiology

Background:

• Current perioperative fluid regimens often involve replacing assumed deficits and losses.
• This practice can lead to significant positive fluid balance and weight gain, potentially causing severe complications.
• The underlying assumptions of increased insensible perspiration and third space loss are often unsubstantiated.

Purpose of the Study:

• To question the common practice of liberal perioperative fluid infusion.
• To investigate the physiological consequences of current fluid management strategies.
• To highlight the importance of appropriate fluid selection and administration timing.

Main Methods:

• Review of current perioperative fluid management principles.
• Analysis of fluid distribution in the body, including interstitial and intravascular spaces.
• Examination of the effects of different fluid types (crystalloids and colloids) on the vascular barrier.
• Consideration of the role of the endothelial glycocalyx in fluid balance.

Main Results:

• Liberal fluid administration results in fluid accumulation within the body, not necessarily in the intravascular space.
• Intravascular blood volume typically remains unchanged after fasting.
• Crystalloids expand the interstitial space, while colloids can damage the vascular barrier, including the endothelial glycocalyx.
• Acute hypervolemia can also deteriorate the endothelial glycocalyx.

Conclusions:

• Undifferentiated fluid administration may promote fluid shifts into the interstitial space.
• The concept of liberal fluid infusion needs re-evaluation.
• Tailoring fluid therapy (type, amount, timing) may improve patient outcomes and reduce complications.