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Does glutamate influence myocardial and peripheral tissue metabolism after aortic valve replacement for aortic

Farkas B Vánky1, Erik Håkanson, Lennart Jorfeldt

  • 1Department of Cardiothoracic Surgery, Linköping Heart Centre, University Hospital, SE-581 85 Linköping, Sweden.

Clinical Nutrition (Edinburgh, Scotland)
|June 2, 2006
PubMed

Insights

Postoperative glutamate infusion increased tissue uptake of glutamate in patients undergoing aortic stenosis surgery. This suggests potential benefits for myocardial and peripheral tissue metabolism after cardiac procedures.

Area of Science:

  • Cardiology
  • Metabolic Research
  • Surgical Science

Background:

  • Glutamate is crucial for myocardial metabolism, especially during ischemia.
  • Patients with coronary artery disease show increased glutamate uptake.
  • Previous studies suggest glutamate infusion improves recovery after coronary surgery.

Purpose of the Study:

  • To investigate the effects of glutamate on myocardial and peripheral tissue metabolism after aortic stenosis surgery.
  • To assess glutamate's impact on tissue metabolism in a surgical context beyond coronary artery disease.

Main Methods:

  • A randomized, double-blind study involving 20 patients undergoing aortic stenosis surgery.
  • Patients received either glutamate or saline infusion post-surgery.
  • Myocardial and leg tissue metabolism were evaluated using organ balance techniques.

Main Results:

  • Glutamate infusion significantly increased glutamate uptake in both myocardial and leg tissues.
  • A notable uptake of lactate by the heart was observed post-glutamate infusion.
  • Peripheral tissue metabolism showed reduced uptake of amino acids and free fatty acids in the glutamate group, indicating altered substrate utilization.

Conclusions:

  • The heart and peripheral tissues actively consumed administered glutamate following aortic stenosis surgery.
  • These findings suggest potentially beneficial effects of glutamate on both cardiac and peripheral tissue metabolism in the postoperative setting.
Abstract

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