Fluid therapy for the surgical patient

Area of Science:

• Anesthesiology
• Surgical Care
• Critical Care Medicine

Background:

• Perioperative fluid therapy is controversial, with conflicting clinical trial results on surgical outcomes.
• Standard fluid therapy practices are often not evidence-based.
• Concepts like third space loss and preloading effectiveness are questioned.

Purpose of the Study:

• To critically review the evidence supporting current standard fluid therapy.
• To analyze clinical trials on fluid therapy's impact on surgical outcomes.
• To evaluate goal-directed and restricted fluid therapy approaches.

Main Methods:

• Systematic review and critical analysis of existing literature and clinical trials.
• Evaluation of methodologies used in fluid loss estimations (e.g., evaporative, third space).
• Comparative analysis of goal-directed versus restricted fluid therapy strategies.

Main Results:

• Standard fluid therapy is not evidence-based; evaporative and third space losses are likely overestimated.
• Fluid accumulation in tissues is minimal, and preloading for neuroaxial blockade is ineffective and potentially harmful.
• Restricted intravenous fluid therapy avoids overload by replacing only actual surgical fluid losses, improving outcomes.

Conclusions:

• Current standard fluid therapy requires re-evaluation based on robust evidence.
• Restricted intravenous fluid therapy, focusing on replacing actual losses and preventing overload, is the recommended approach.
• Evidence supports fluid replacement for improved outcomes, particularly in outpatient surgery.