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Related Experiment Videos

Lipolysis during abdominal surgery

G Felländer1, J Nordenström, I Tjäder

  • 1Department of Medicine, Huddinge Hospital, Karolinska Institute, Stockholm, Sweden.

The Journal of Clinical Endocrinology and Metabolism
|January 1, 1994
PubMed
Summary
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General anesthesia and surgery accelerate fat breakdown (lipolysis) in subcutaneous tissue due to increased catecholamines. Perioperative glucose infusion further boosts lipolysis by activating sympathetic nervous activity.

Area of Science:

  • Metabolism
  • Endocrinology
  • Surgical Physiology

Background:

  • Subcutaneous adipose tissue lipolysis is a key metabolic process influenced by surgical stress and anesthesia.
  • Understanding the regulation of lipolysis during surgery is crucial for optimizing perioperative metabolic management.

Purpose of the Study:

  • To investigate the effects of general anesthesia and abdominal surgery on subcutaneous adipose tissue lipolysis.
  • To examine the impact of perioperative intravenous glucose infusion on lipolysis during surgery.

Main Methods:

  • Microdialysis was used to measure glycerol levels (lipolysis index) in subcutaneous adipose tissue during elective cholecystectomy.
  • Plasma levels of catecholamines (noradrenaline, adrenaline), insulin, glucagon, and cortisol were monitored.

Related Experiment Videos

  • Adipose tissue blood flow was assessed using ethanol's escape from the dialysis solvent.

    • Main Results:

    • Lipolysis, indicated by microdialysate glycerol, increased steadily from anesthesia induction until abdominal closure, remaining elevated post-surgery.
    • Plasma glycerol and catecholamine levels paralleled the lipolysis index, while insulin, glucagon, and cortisol did not show significant changes.
    • Intravenous glucose infusion significantly amplified adipose tissue lipolysis threefold compared to saline, despite induced hyperinsulinemia, and increased plasma noradrenaline.

    Conclusions:

    • General anesthesia and abdominal surgery accelerate subcutaneous adipose tissue lipolysis via increased catecholamine production.
    • Perioperative glucose infusion enhances lipolysis through additional sympathetic nervous system activation, overriding glucose-induced insulin's antilipolytic effect.
    • Subcutaneous adipose tissue appears particularly sensitive to glucose and anesthesia-induced lipolytic stimuli compared to other adipose regions.