Epidural blockade suppresses lipolysis during major abdominal surgery

Area of Science:

• Anesthesiology
• Metabolic Surgery
• Surgical Oncology

Background:

• Perioperative lipolysis is a significant metabolic response during major surgery.
• Understanding the impact of anesthetic techniques on lipolysis is crucial for patient recovery.

Purpose of the Study:

• To investigate the effect of thoracic epidural anesthesia (epidural block) on perioperative lipolysis.
• To assess the influence of epidural block on metabolic substrates and hormones during surgery.

Main Methods:

• Randomized controlled trial involving 14 patients undergoing elective colorectal surgery.
• Comparison between general anesthesia with epidural block (EDA) and general anesthesia alone (control).
• Assessment of lipolysis using stable isotope tracers ([1,1,2,3,3-(2)H(5)]glycerol) and measurement of plasma metabolic markers and hormones.

Main Results:

• Epidural block significantly reduced the rate of glycerol appearance (lipolysis) intraoperatively and postoperatively.
• Plasma concentrations of glycerol, free fatty acids (FFA), lactate, and insulin remained unchanged between groups.
• Intraoperative levels of glucagon and cortisol were lower in the epidural block group.

Conclusions:

• Thoracic epidural anesthesia effectively suppresses lipolysis during and after major abdominal surgery.
• The observed suppression of lipolysis occurs independently of changes in plasma glycerol or FFA concentrations.
• Epidural block may modulate the neuroendocrine stress response during major surgery.