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Related Experiment Videos

Depressed function of isolated hearts from hyperdynamic septic rats.

K H McDonough, C H Lang, J J Spitzer

    Circulatory Shock
    |January 1, 1984
    PubMed
    Summary

    Hearts from septic rats show reduced physiological reserves, evidenced by impaired cardiac function and an inability to respond to increased preloads, despite maintained in vivo hemodynamics. This highlights a loss of myocardial reserve in sepsis.

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    Area of Science:

    • Cardiology
    • Physiology
    • Sepsis Research

    Background:

    • Sepsis often leads to cardiovascular dysfunction.
    • In vivo studies show elevated cardiac output in sepsis, mediated by increased heart rate.
    • The intrinsic myocardial reserve in sepsis remains incompletely understood.

    Purpose of the Study:

    • To assess the physiological reserves of hearts from rats with sustained hypermetabolic sepsis.
    • To define sepsis-induced myocardial dysfunction using Frank-Starling curves.
    • To investigate the in vitro mechanical function of septic rat hearts under controlled preload conditions.

    Main Methods:

    • Isolated perfused working heart preparation from septic and control rats.
    • Assessment of cardiac performance, including peak systolic pressure and cardiac output.
    • Evaluation of heart function recovery after an acute ischemic episode.
    • Controlled variation of left atrial filling pressures (preload).

    Main Results:

    • Septic rat hearts exhibited depressed cardiac performance (pressure and output) across tested preloads.
    • Despite depressed function, most septic hearts recovered post-ischemia.
    • A loss of myocardial reserve was evident, characterized by an impaired response to increased preload.

    Conclusions:

    • Hearts from septic rats demonstrate a significant loss of myocardial reserve.
    • This dysfunction is primarily an inability to augment cardiac output with increased preload.
    • Sepsis-induced myocardial impairment is demonstrable in vitro, even when in vivo hemodynamics appear preserved.

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