[Insulin secretion after surgery: measurements after abdominal operations]

Area of Science:

• Endocrinology
• Metabolism
• Surgical Physiology

Background:

• Surgical trauma can significantly impact metabolic homeostasis.
• Understanding the body's response to glucose and insulin post-surgery is crucial for patient recovery.

Purpose of the Study:

• To investigate glucose and insulin dynamics in patients following surgical trauma.
• To assess the accuracy of peripheral insulin measurements versus portal vein measurements.
• To determine the effect of surgical trauma severity on glucose utilization and insulin secretion.

Main Methods:

• Measured glucose and insulin levels in 30 patients at multiple postoperative time points (days 2-6, 6-10, 10-21).
• Administered an intravenous glucose load (1 g/kg body weight over 60 minutes).
• Analyzed insulin and glucose in both portal venous and peripheral (cubital) venous blood.

Main Results:

• Peripheral insulin measurements showed poor correlation with actual insulin secretion post-surgery.
• Significant variations were observed between portal vein and peripheral vein insulin concentrations after glucose load.
• Greater surgical trauma, such as abdominal operations, led to impaired glucose utilization in the first postoperative week.
• Insulin secretion in response to an intravenous glucose load was significantly reduced during the first postoperative week.

Conclusions:

• Peripheral insulin levels are unreliable indicators of insulin secretion in the postoperative period.
• Abdominal surgery disrupts glucose utilization, particularly within the first week.
• Postoperative insulin secretion is notably diminished, especially during the initial week following surgery.