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Left ventricular performance during continuous endotoxin-induced hyperdynamic endotoxemia in sheep

S Noshima1, H Noda, D N Herndon

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

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1993
PubMed
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This study in sheep shows that endotoxemia initially depresses cardiac function but leads to a hyperdynamic state with increased cardiac output despite reduced myocardial contractility.

Area of Science:

  • Cardiovascular Physiology
  • Sepsis Pathophysiology

Background:

  • Endotoxemia, induced by lipopolysaccharide (LPS), is a critical factor in sepsis.
  • Understanding cardiac function during endotoxemia is vital for managing septic shock.

Purpose of the Study:

  • To investigate cardiac function in an unanesthetized ovine model of hyperdynamic endotoxemia.
  • To characterize the temporal changes in cardiac output and myocardial contractility following LPS administration.

Main Methods:

  • Utilized an ovine model with instrumentation for left ventricular diameter, pressure, and cardiac output measurements.
  • Administered Escherichia coli lipopolysaccharide (LPS) to induce endotoxemia and compared with a saline control group.
  • Monitored cardiac function parameters, including end-systolic pressure-diameter relationship, over 24 hours.

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Main Results:

  • Early phase (1-8h): LPS induced a hypodynamic state with reduced cardiac output and myocardial contractility.
  • Late phase (24h): A persistent hyperdynamic state emerged with significantly increased cardiac output.
  • Despite elevated cardiac output, myocardial contractility, assessed by the end-systolic pressure-diameter relationship, remained depressed.

Conclusions:

  • Hyperdynamic endotoxemia in this ovine model is characterized by an initial hypodynamic phase followed by a hyperdynamic state.
  • Increased cardiac output in the hyperdynamic phase occurs concurrently with impaired myocardial contractility.
  • This model provides insights into the complex cardiovascular adaptations during sepsis.