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Related Experiment Videos

A prosthetic myocardium: hemodynamic advantages

H Imamura

    Japanese Circulation Journal
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A new prosthetic myocardium effectively restores left ventricular function after surgical excision of damaged tissue. This innovative device improves cardiac output and contractility, offering hope for patients with severe heart conditions.

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    Area of Science:

    • Cardiovascular Surgery
    • Biomedical Engineering
    • Heart Failure Research

    Background:

    • Surgical excision of large left ventricular aneurysms or infarcts can lead to impaired cardiac performance.
    • Reduced ventricular volume and contractility are primary causes of post-surgical left ventricular failure.
    • Existing treatments often struggle to fully restore cardiac output after extensive myocardial damage.

    Purpose of the Study:

    • To evaluate a prototype prosthetic myocardium designed to mimic natural left ventricular function.
    • To assess the device's ability to restore ventricular volume and contractility post-excision.
    • To investigate the hemodynamic effects of the prosthetic myocardium in a canine model.

    Main Methods:

    • A canine model was used, involving surgical infarction and excision of approximately 17% of the left ventricle under cardiopulmonary bypass.

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  • A prototype prosthetic myocardium was implanted to assist the remaining ventricle.
  • Hemodynamic parameters were measured before and after device activation to assess its efficacy.

    • Main Results:

    • The prosthetic myocardium significantly improved hemodynamic parameters in dogs with induced congestive heart failure.
    • Key improvements included increased mean aortic pressure (19%), left ventricular systolic pressure (24%), and stroke volume (34%).
    • The device also reduced left ventricular end-diastolic pressure (43%) and mean left atrial pressure (22%), while increasing left ventricular stroke work (88%).

    Conclusions:

    • The prototype prosthetic myocardium demonstrates significant potential for restoring cardiac function after extensive left ventricular damage.
    • The device effectively addresses both volume reduction and contractility impairment, crucial factors in post-surgical heart failure.
    • This represents a promising advancement towards developing an orthotopic device for myocardial replacement.