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Related Experiment Videos

Muscle function in critically ill patients.

A J Wagenmakers1

  • 1Department of Human Biology and Stable Isotope Research Centre, Maastricht University, Maastricht, 6200 MD, The Netherlands.

Clinical Nutrition (Edinburgh, Scotland)
|September 6, 2001
PubMed
Summary
This summary is machine-generated.

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Critical illness causes muscle dysfunction by altering membrane potential and ion gradients. Improving muscle function and membrane potential should be primary goals for clinical nutrition interventions in intensive care units.

Area of Science:

  • Critical care medicine
  • Muscle physiology
  • Cellular metabolism

Background:

  • Endotoxemia and inflammation in intensive care unit (ICU) patients acutely decrease muscle resting membrane potential.
  • This leads to loss of the sodium-potassium gradient, increased cytosolic Ca(2+), reduced muscle contractility, impaired amino acid gradients, and increased proteolysis.
  • Mitochondrial density can decrease significantly within days, impairing cellular substrate metabolism.

Purpose of the Study:

  • To identify the causes of muscle weakness and loss of contractility in ICU patients.
  • To explore the relationship between impaired muscle contractility and metabolic disturbances.
  • To propose muscle function as a primary endpoint variable for clinical nutrition interventions.

Main Methods:

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  • The study proposes a theoretical framework based on existing physiological principles and clinical observations in ICU patients.
  • It emphasizes the need for new measurement modalities for routine ICU use.
  • It reviews the potential negative impact of muscle relaxants on recovery.

    • Main Results:

    • Critical illness triggers a cascade of events leading to impaired muscle function and metabolism.
    • Muscle protein and substrate metabolism normalization is contingent upon restoring muscle membrane potential and function.
    • Muscle relaxants may hinder recovery by causing functional denervation and altering myofibril structure.

    Conclusions:

    • Clinical nutrition interventions should prioritize improving muscle function and restoring muscle membrane potential.
    • Muscle function and membrane potential should serve as primary outcome variables in clinical trials.
    • Restoring these parameters is crucial for normalizing muscle metabolism and facilitating patient recovery.