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Myocardial dysfunction in septic shock.

A Kumar1, C Haery, J E Parrillo

  • 1Section of Critical Care Medicine, Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois, USA. akumar@rush.edu

Critical Care Clinics
|April 18, 2000
PubMed
Summary
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Septic shock causes myocardial depression due to a circulating substance, not poor blood flow. Current treatments focus on organ perfusion, while future therapies may target cellular signaling pathways.

Area of Science:

  • Cardiology
  • Immunology
  • Critical Care Medicine

Background:

  • Septic shock commonly causes myocardial depression, characterized by biventricular dilatation and reduced ejection fraction.
  • This cardiac dysfunction is typically reversible and occurs despite a hyperdynamic circulation.

Purpose of the Study:

  • To elucidate the mechanisms underlying human septic myocardial depression.
  • To identify the causative factors and potential therapeutic targets for septic cardiomyopathy.

Main Methods:

  • Review of existing literature on septic shock and myocardial function.
  • Analysis of the role of circulating factors and intracellular signaling pathways.

Main Results:

  • Septic myocardial depression is attributed to a circulating myocardial depressant substance, not myocardial hypoperfusion.

Related Experiment Videos

  • This substance involves low concentrations of Tumor Necrosis Factor-alpha (TNF-alpha) and Interleukin-1 beta (IL-1 beta) acting synergistically.
  • Mechanisms include the generation of nitric oxide (NO) and cyclic guanosine monophosphate (cGMP).

    • Conclusions:

    • Current therapeutic strategies focus on fluid resuscitation and vasopressors/inotropes to ensure adequate organ perfusion.
    • Direct manipulation of intracellular signaling pathways is a promising long-term therapeutic strategy for septic myocardial depression.