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Heart function after severe hemorrhagic shock.

J A Kline1, L R Thornton, G D Lopaschuk

  • 1Department of Emergency Medicine, Carolinas Medical Center, Charlotte, North Carolina 28232-2861, USA.

Shock (Augusta, Ga.)
|December 10, 1999
PubMed
Summary
This summary is machine-generated.

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Severe hemorrhagic shock, even when brief, significantly impairs heart function more than prolonged moderate shock. This cardiac dysfunction stems from energy transfer issues, not substrate or TNF-alpha levels.

Area of Science:

  • Cardiovascular Physiology
  • Hemorrhagic Shock Research
  • Cardiac Metabolism

Background:

  • Hemorrhagic hypotension can lead to cardiac dysfunction.
  • The relative importance of hypotension depth versus duration on intrinsic heart function is not fully understood.

Purpose of the Study:

  • To investigate whether brief, severe hemorrhagic hypotension or prolonged, moderate hemorrhagic hypotension has a greater impact on intrinsic cardiac function.
  • To elucidate the underlying mechanisms of post-hemorrhagic cardiac dysfunction.

Main Methods:

  • Rats were subjected to either 1 hour of severe hypotension (MAP 25 mm Hg) or 3 hours of moderate hypotension (MAP 40 mm Hg).
  • In vitro working heart perfusion was used to assess cardiac function and efficiency.
  • Myocardial tissue was analyzed for energy metabolites (CoA esters, ATP) and TNF-alpha.

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Main Results:

  • Hearts from rats experiencing 1 hour of severe shock generated 20% less hydraulic work compared to controls or those with prolonged moderate shock.
  • Cardiac efficiency was significantly reduced in the severe shock group.
  • No significant differences in myocardial CoA ester, ATP, or TNF-alpha were found between groups immediately post-shock.

Conclusions:

  • The depth of hypotension is a more critical factor than its duration in causing intrinsic cardiac dysfunction.
  • Post-hemorrhagic cardiac dysfunction is not attributed to substrate limitation or myocardial TNF-alpha accumulation.
  • The findings suggest impaired energy transfer from oxygen to cardiac work is the likely cause.