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A physiologic explanation for cardiac deterioration in septic shock.

J E Demeules

    The Journal of Surgical Research
    |June 1, 1984
    PubMed
    Summary

    Septic shock serum depresses heart muscle function by affecting electrical activity and contraction. Pre-treatment with KCL solution prevented these negative effects, suggesting fast channel involvement in septic myocardial depression.

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    Area of Science:

    • Cardiology
    • Physiology
    • Pathophysiology

    Background:

    • Sepsis can lead to myocardial depression, impacting cardiac function.
    • Understanding the mechanisms of septic myocardial depression is crucial for treatment.

    Purpose of the Study:

    • To investigate the effects of septic shock serum on myocardial contractility and electrophysiology.
    • To elucidate the role of fast channel activity in septic myocardial depression.

    Main Methods:

    • Rabbit papillary muscle was exposed to serum from dogs with induced septic shock (Escherichia coli).
    • Electrophysiological parameters (action potential amplitude, duration, resting membrane potential, phase velocities) and mechanical parameters (peak tension, contraction/relaxation velocity) were measured.
    • The effect of KCL pre-treatment on these parameters was assessed.

    Main Results:

    • Septic shock serum significantly depressed action potential amplitude, duration, resting membrane potential, and velocities of phases 0 and 2.
    • Mechanical function was also impaired, with decreased peak tension and velocities of contraction and relaxation.
    • Pre-exposure to 30 mM KCL solution abolished these depressive effects.

    Conclusions:

    • Septic shock induces significant myocardial depression affecting both electrical and mechanical properties.
    • The findings suggest that fast channel abnormalities mediate the myocardial defects observed in septic shock.
    • KCL may play a protective role by mitigating these effects.

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