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Sustained elevation in circulating catecholamine levels during polymicrobial sepsis

P Y Hahn1, P Wang, S M Tait

  • 1Department of Surgery, Michigan State University, East Lansing 48824, USA.

Shock (Augusta, Ga.)
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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Elevated catecholamines, including epinephrine, norepinephrine, and dopamine, persist throughout early and late polymicrobial sepsis. These sustained high levels may contribute to early sepsis hypermetabolism but not late-stage hypometabolism.

Area of Science:

  • Physiology
  • Pathophysiology
  • Endocrinology

Background:

  • Sepsis is characterized by complex physiological changes, including alterations in catecholamine levels.
  • Previous studies suggest increased catecholamines in early sepsis, but their persistence in later stages remains unclear.

Purpose of the Study:

  • To investigate whether elevated plasma catecholamine levels (epinephrine, norepinephrine, dopamine) are sustained during the late, hypodynamic stages of polymicrobial sepsis.
  • To explore the association between sustained catecholamine levels and metabolic/hemodynamic states in sepsis.

Main Methods:

  • Polymicrobial sepsis was induced in rats via cecal ligation and puncture (CLP).
  • Plasma catecholamine levels were measured at 0.5, 2, 10 (early sepsis), and 20 hours (late sepsis) post-CLP using a [3H]-radioenzymatic assay.

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Main Results:

  • Plasma levels of epinephrine, norepinephrine, and dopamine significantly increased as early as 0.5 hours after CLP.
  • Elevated catecholamine levels were observed throughout the study, persisting into the late sepsis phase.
  • A lack of association was found between elevated catecholamine levels and the hypometabolic/hypodynamic state in late sepsis.

Conclusions:

  • Circulating catecholamine levels are elevated in both early and late stages of polymicrobial sepsis.
  • Sustained high catecholamine levels in early sepsis may contribute to hypermetabolism.
  • The elevated catecholamine levels in late sepsis do not correlate with the observed hypometabolic/hypodynamic state.