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Related Experiment Videos

Substrate utilization/insulin resistance in sepsis/trauma

R R Wolfe1

  • 1University of Texas Medical Branch, Shriners Burns Institute, Galveston, TX 77550, USA.

Bailliere'S Clinical Endocrinology and Metabolism
|May 20, 1998
PubMed
Summary

Critically ill patients exhibit altered metabolism, with increased glucose production and fat breakdown. Carbohydrates are recommended as the primary energy source to support protein synthesis.

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Area of Science:

  • Critical care medicine
  • Human metabolism
  • Nutritional support

Background:

  • Critically ill patients experience significant alterations in endogenous substrate metabolism.
  • Understanding these metabolic changes is crucial for optimizing nutritional strategies in critical care.

Purpose of the Study:

  • To elucidate the complex alterations in glucose and lipid metabolism in critically ill patients.
  • To provide evidence-based recommendations for substrate utilization in nutritional therapy for this patient population.

Main Methods:

  • Review of endogenous substrate metabolism in critically ill patients.
  • Analysis of glucose production, clearance, and insulin sensitivity.
  • Assessment of lipolysis, fatty acid kinetics, and hepatic triglyceride metabolism.
  • Consideration of indirect calorimetry data and substrate oxidation patterns.

Main Results:

  • Elevated glucose production with diminished suppression by exogenous glucose.
  • Increased glucose clearance, posing a risk of hypoglycemia, alongside impaired insulin sensitivity leading to hyperglycemia.
  • Accelerated lipolysis releasing excess free fatty acids, exceeding oxidation rates and promoting hepatic triglyceride accumulation.

Conclusions:

  • Critically ill patients display profound metabolic dysregulation affecting glucose and lipid handling.
  • Carbohydrates should be the primary non-protein calorie source to leverage insulin's anabolic effect on protein synthesis.
  • Exogenous fat administration offers limited benefits due to abundant endogenous fatty acids and potential for hepatic fat overload.

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