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Related Experiment Videos

Structure-function relationships in the septic rat heart

R D Piper1, F Y Li, M L Myers

  • 1A. C. Burton Vascular Biology Laboratory, Victoria Hospital, London, Ontario, Canada.

American Journal of Respiratory and Critical Care Medicine
|December 31, 1997
PubMed
Summary

Sepsis can cause heart muscle dysfunction without causing swelling or tissue damage. This study found sepsis-induced myocardial depression occurs even without structural changes in the heart tissue.

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Area of Science:

  • Cardiology
  • Pathology
  • Sepsis Research

Background:

  • Sepsis is known to cause myocardial depression and tissue injury.
  • Previous studies suggest myocardial edema and histologic changes are linked to sepsis-induced cardiac dysfunction.

Purpose of the Study:

  • To investigate if myocardial edema and tissue injury are necessary for developing contractile dysfunction in sepsis, specifically in the absence of shock.
  • To assess microvascular albumin flux, tissue edema, and morphometry in sepsis models.

Main Methods:

  • Utilized the cecal ligation and perforation (CLP) model in Sprague-Dawley rats to induce sepsis.
  • Assessed myocardial function using the Langendorff isolated heart technique 24 hours post-CLP.
  • Measured microvascular albumin flux, myocardial wet:dry weight ratio for edema, and performed electron microscopy for tissue injury assessment.

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Main Results:

  • Sepsis significantly reduced left-ventricular developed pressure and the maximal rate of pressure change (+/-dP/dtmax).
  • Left ventricular resting tension decreased after ischemia in septic rats.
  • No significant myocardial edema or evidence of tissue injury was observed at 24 or 48 hours post-CLP, and albumin flux was reduced.

Conclusions:

  • Polymicrobial normotensive sepsis induces myocardial contractile depression.
  • These cardiac functional changes occur independently of myocardial edema or structural tissue injury.