Epidural anesthesia and analgesia decrease the postoperative incidence of insulin resistance in preoperative...

Area of Science:

• Endocrinology
• Anesthesiology
• Metabolic Surgery

Background:

• Insulin resistance (IR) is a known endocrine stress response to surgery.
• The impact of preoperative IR on postoperative endocrine function remains unclear.
• Characterizing preoperative IR and its modulation by epidural analgesia is crucial for surgical patients.

Purpose of the Study:

• To assess the preoperative state of insulin resistance in patients undergoing hip or knee arthroplasty.
• To determine if perioperative epidural analgesia modifies the postoperative IR status.
• To compare the effects of epidural analgesia versus general anesthesia on IR.

Main Methods:

• Sixty patients undergoing hip/knee arthroplasty were categorized as insulin-resistant or non-insulin-resistant using the homeostatic model assessment (HOMA).
• Patients were randomized to receive either epidural anesthesia/analgesia or general anesthesia with patient-controlled analgesia.
• HOMA was reassessed post-surgery to determine the postoperative IR state.

Main Results:

• Epidural anesthesia significantly reduced postoperative IR in patients who were preoperatively insulin-resistant (P < 0.01).
• Non-insulin-resistant patients showed no significant difference in postoperative IR between the epidural and control groups (P > 0.05).
• Visual analog scale pain scores were similar across groups post-surgery.

Conclusions:

• Epidural anesthesia and analgesia decrease the incidence of postoperative insulin resistance specifically in patients with pre-existing IR.
• This suggests a targeted benefit of epidural techniques for managing metabolic stress in susceptible surgical patients.
• General anesthesia with patient-controlled analgesia did not show the same effect on IR in this cohort.