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Related Experiment Videos

Prolonged left ventricular dysfunction induced by sequential multifocal ischemic infarcts in dogs.

J Polanski, G Mandell, T Wasfie

    Artificial Organs
    |November 1, 1984
    PubMed
    Summary
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    This study details a new method for inducing multifocal ischemia in dogs, causing left ventricular (LV) dysfunction. This animal model reliably simulates chronic heart failure, aiding research into LV assist systems.

    Area of Science:

    • Cardiovascular Science
    • Animal Models
    • Myocardial Infarction Research

    Background:

    • Developing reliable animal models for chronic heart failure is crucial for advancing cardiovascular research.
    • Left ventricular (LV) functional impairment is a hallmark of advanced heart disease.
    • Existing models often do not fully replicate the complexities of chronic ischemic conditions.

    Purpose of the Study:

    • To describe a novel method for inducing multifocal myocardial ischemia in dogs.
    • To establish a chronic left ventricular failure model for evaluating therapeutic interventions.
    • To assess the reproducibility and pathological outcomes of the induced ischemia.

    Main Methods:

    • Implantation of electrodes in multiple coronary artery branches in mongrel dogs.

    Related Experiment Videos

  • Application of an anodal current to induce repeated multifocal ischemia over several weeks.
  • Monitoring of cardiac biomarkers (creatine kinase), electrocardiographic changes, and LV function.

    • Main Results:

    • Significant increases in serum creatine kinase cardiac isoenzyme and consistent ischemic ECG changes were observed.
    • Animals exhibited tachypnea on exertion and a substantial reduction in cardiac reserve.
    • Postmortem examinations revealed coronary artery occlusions, fibrosis, and collateralization consistent with induced ischemia.

    Conclusions:

    • The described method reliably induces multifocal myocardial ischemic changes and chronic LV failure in dogs.
    • This model offers a valuable platform for the preclinical evaluation of LV assist systems.
    • The pathological findings support the long-term efficacy of the induced ischemic model.