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Ventricular function in norepinephrine-induced cardiomyopathic rabbits

J C Lee, S E Downing

    The American Journal of Physiology
    |February 1, 1982
    PubMed
    Summary

    Catecholamine cardiomyopathy (CM) induced by norepinephrine infusion impairs rabbit heart function. Histological damage correlated with reduced cardiac performance and altered responses to stimulation.

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    Area of Science:

    • Cardiology
    • Pathology
    • Pharmacology

    Background:

    • Catecholamine cardiomyopathy (CM) is a condition affecting heart function.
    • Norepinephrine (NE) is implicated in the development of CM.
    • Understanding the functional and histological changes in CM is crucial.

    Purpose of the Study:

    • To investigate the functional consequences of catecholamine-induced cardiomyopathy in rabbits.
    • To assess the impact of hypercapnia and inotropic stimulation on cardiac function in CM.
    • To correlate functional deficits with histopathological findings.

    Main Methods:

    • Catecholamine cardiomyopathy (CM) was induced in rabbits via norepinephrine (NE) infusion.
    • Left ventricular (LV) function, including contractility and pump function (VF), was assessed 2 days post-infusion.
    • Hypercapnia and NE inotropic responsiveness were evaluated using LV function curves and SV10 measurements.

    Main Results:

    • Rabbits with CM exhibited significantly reduced stroke volume at a left ventricular end-diastolic pressure of 10 cmH2O (SV10) compared to controls.
    • Hypercapnia caused a greater depression of ventricular function in CM rabbits.
    • Histological examination revealed extensive myofiber injury in CM animals, correlating with functional defects.

    Conclusions:

    • Norepinephrine-induced catecholamine cardiomyopathy leads to significant cardiac dysfunction in rabbits.
    • A dissociation between velocity (dP/dtmax) and force (SV10) responsiveness to inotropic stimulation was observed in CM.
    • Histopathological changes are directly correlated with the observed functional impairments in CM.

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