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Myocardial depression in hyperdynamic endotoxemia.

H J Lubbesmeyer1, J L Theissen, S Doty

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

Circulatory Shock
|October 1, 1988
PubMed
Summary
This summary is machine-generated.

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Assessing myocardial depression in septic shock animal models is challenging. Fluid resuscitation in endotoxemic sheep revealed significant myocardial depression, impacting cardiac function despite adequate fluid levels.

Area of Science:

  • Cardiovascular Physiology
  • Septic Shock Research
  • Animal Models in Medicine

Background:

  • Assessing myocardial depression in hypovolemic septic shock animal models presents significant challenges.
  • Endotoxemia serves as a common model to study septic shock pathophysiology.
  • Fluid resuscitation is a critical intervention in managing septic shock.

Purpose of the Study:

  • To evaluate the presence and extent of myocardial depression in fluid-resuscitated conscious sheep subjected to endotoxemia.
  • To investigate the utility of a conscious sheep model for assessing cardiac dysfunction during septic shock.

Main Methods:

  • Conscious sheep underwent chronic instrumentation for hemodynamic monitoring.
  • Endotoxin (lipopolysaccharide) was administered intravenously to induce endotoxemia.

Related Experiment Videos

  • Two groups were compared: baseline fluid resuscitation versus aggressive fluid resuscitation (7 ml/kg/h Ringer's lactate).

    • Main Results:

    • Left ventricular stroke work index was depressed in both endotoxemic groups eight hours post-LPS administration.
    • Aggressively resuscitated sheep (7 ml/kg/h) exhibited myocardial depression, evidenced by a downward and rightward shift in the Starling work curve.
    • This depression occurred with normal left atrial pressure and constant peripheral resistance, indicating direct cardiac impairment.

    Conclusions:

    • Fluid resuscitation in endotoxemia does not prevent myocardial depression.
    • The conscious sheep model with endotoxemia is suitable for assessing myocardial depression.
    • Myocardial depression in this model is characterized by impaired cardiac contractility independent of preload or afterload.