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Related Experiment Videos

Hypertonic saline/dextran improves septic myocardial performance

R D Ing1, M N Nazeeri, S Zeldes

  • 1Department of Surgery, Wayne State University, Detroit, Michigan.

The American Surgeon
|July 1, 1994
PubMed
Summary

Hypertonic saline dextran improved heart muscle function in septic animals, significantly boosting contractility and relaxation. These beneficial effects on myocardial performance were observed without altering coronary flow or oxygen consumption.

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Area of Science:

  • Cardiovascular Physiology
  • Sepsis Research
  • Pharmacological Interventions

Background:

  • Sepsis often leads to myocardial depression, impairing heart function.
  • Understanding interventions to support cardiac performance during sepsis is critical.

Purpose of the Study:

  • To investigate the effects of hypertonic saline dextran on cardiac contractile performance in a sepsis model.
  • To assess whether observed effects are linked to changes in coronary hemodynamics or oxygen use.

Main Methods:

  • Utilized an isolated perfused heart preparation from control and septic animal models.
  • Measured myocardial performance parameters: developed pressure (DP), maximal rate of tension development (+dp/dt), and relaxation rate (-dp/dt).
  • Assessed coronary flow rate and myocardial oxygen consumption (MVO2) in septic preparations.

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Main Results:

  • Hypertonic saline dextran had minimal impact on contractile function in control hearts.
  • In septic hearts, hypertonic saline dextran significantly improved myocardial contractility, increasing DP and +dp/dt to 150% of baseline.
  • Relaxation rate (-dp/dt) improved to 134% of baseline in septic hearts.
  • These improvements were independent of changes in coronary flow or MVO2.

Conclusions:

  • Hypertonic saline dextran effectively enhances myocardial contractile function during sepsis.
  • The beneficial effects on cardiac performance are likely a direct action on the myocardium, not mediated by altered blood flow or oxygen metabolism.