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Related Experiment Videos

Beta endorphin, a vasoconstrictor during septic shock.

S Doty1, L Traber, D Herndon

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

The Journal of Trauma
|February 1, 1988
PubMed
Summary
This summary is machine-generated.

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Sepsis can cause dangerous changes in blood pressure, linked to beta-endorphin. Blocking these effects with naloxone may reduce sepsis-related mortality.

Area of Science:

  • Physiology
  • Pharmacology

Background:

  • Sepsis is associated with increased total peripheral resistance index (TPRI) and decreased cardiac index (CI), potentially leading to mortality.
  • The role of endogenous opiates in mediating these sepsis-induced cardiovascular changes is not fully understood.

Purpose of the Study:

  • To investigate the relationship between endogenous opiates, specifically beta-endorphin, and the cardiovascular response to endotoxin (LPS) in sepsis.
  • To evaluate the effect of naloxone, an opiate antagonist, on the cardiovascular changes and mortality associated with LPS administration.

Main Methods:

  • Chronically instrumented sheep received Escherichia coli endotoxin (LPS).
  • Survivors and non-survivors of LPS were compared, as well as animals receiving half the LPS dose.
  • Two groups received naloxone: one pre-treated before LPS, the other post-treated.

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Main Results:

  • The response to LPS included both vasoconstrictive and vasodilative phases.
  • Vasoconstriction correlated with elevated beta-endorphin levels and was sustained until death in non-survivors.
  • Naloxone administration, both before and after LPS, reduced the increase in total peripheral resistance index compared to untreated sheep.

Conclusions:

  • The vasoconstrictive response to LPS in sepsis is linked to elevated beta-endorphin levels and mortality.
  • Naloxone blockade attenuates this vascular response, suggesting a role for endogenous opiates in sepsis-induced cardiovascular dysfunction.