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Postoperative parenteral nutrition while proactively minimizing insulin resistance
Monika Svanfeldt1, Anders Thorell, Jonas Nygren
1Division of Surgery, Department for Clinical Science Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.
Nutrition (Burbank, Los Angeles County, Calif.)
|February 14, 2006
Summary
Total parenteral nutrition (TPN) and hypocaloric glucose did not significantly improve postoperative insulin sensitivity. TPN attenuated starvation-like metabolic changes, including nitrogen balance, compared to hypocaloric glucose.
Area of Science:
- Metabolic effects of perioperative nutrition
- Surgical patient metabolic response
Background:
- Perioperative insulin resistance can be minimized by oral carbohydrates and epidural anesthesia.
- Comparing total parenteral nutrition (TPN) and hypocaloric glucose is crucial for understanding their metabolic effects.
Purpose of the Study:
- To compare the metabolic effects of postoperative TPN versus hypocaloric glucose.
- To assess their impact on insulin sensitivity and glucose kinetics after preoperative carbohydrate loading and epidural anesthesia.
Main Methods:
- Randomized trial of 13 colorectal resection patients.
- Insulin sensitivity and glucose kinetics measured via hyperinsulinemic and normoglycemic clamps.
- Indirect calorimetry and nitrogen excretion assessed.
Main Results:
- Both TPN and hypocaloric glucose reduced insulin-stimulated glucose disposal similarly.
- TPN improved nitrogen balance and altered substrate utilization compared to hypocaloric glucose.
- Endogenous glucose production increased only in the hypocaloric glucose group.
Conclusions:
- TPN does not enhance postoperative peripheral insulin sensitivity in this context.
- TPN mitigates starvation-like metabolic changes more effectively than hypocaloric glucose.
- Metabolic management strategies require careful consideration for surgical patients.