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Related Experiment Videos

Cardiac dysfunction after acute endotoxin administration in conscious sheep.

K Sugi1, J Newald, L D Traber

  • 1Department of Anesthesiology and Physiology, University of Texas Medical Branch, Galveston.

The American Journal of Physiology
|May 1, 1991
PubMed
Summary

Endotoxemia induced by lipopolysaccharide (LPS) causes myocardial depression in sheep. Cardiac function and left ventricular contractility significantly decreased after LPS administration.

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Area of Science:

  • Cardiovascular Physiology
  • Sepsis Pathophysiology
  • Animal Models in Research

Background:

  • Hyperdynamic endotoxemia is a critical condition characterized by increased cardiac output and vasodilation.
  • Understanding the direct effects of endotoxins on myocardial function is crucial for developing effective treatments.
  • The ovine model offers a relevant physiological system for studying cardiovascular responses to sepsis.

Purpose of the Study:

  • To investigate the impact of lipopolysaccharide (LPS)-induced hyperdynamic endotoxemia on cardiac function in an unanesthetized ovine model.
  • To assess changes in left ventricular (LV) contractility and dimensions during endotoxemia.
  • To confirm the hypothesis of myocardial depression following LPS administration.

Main Methods:

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  • Utilized an unanesthetized ovine model with instrumentation for left ventricular (LV) dimension analysis.
  • Measured LV, aortic, atrial, central venous, and pulmonary arterial pressures, and cardiac output.
  • Administered Escherichia coli endotoxin (lipopolysaccharide) to the experimental group and compared it to a sham group.

    • Main Results:

    • Cardiac index significantly increased in the LPS group between 8 and 12 hours post-administration.
    • Left ventricular (LV) end-systolic pressure-volume relations (maximum elastance) significantly decreased, indicating impaired contractility.
    • Other LV contractility indexes, including maximum pressure development and ejection fraction, were reduced, with increased LV end-systolic and diastolic volumes.

    Conclusions:

    • Lipopolysaccharide (LPS) administration in the ovine model leads to significant myocardial depression.
    • The observed reduction in LV contractility and altered pressure-volume relations confirm cardiac dysfunction during endotoxemia.
    • This study validates the ovine model for investigating sepsis-induced cardiac impairment.