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Transventricular revascularization by laser

M Mirhoseini, M Muckerheide, M M Cayton

    Lasers in Surgery and Medicine
    |January 1, 1982
    PubMed
    Summary
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    This study explored laser-created channels for treating ischemic myocardium in dogs. The laser-generated channels remained open and appeared to protect heart tissue, suggesting a potential new therapy for heart disease.

    Area of Science:

    • Cardiovascular Surgery
    • Biomedical Engineering
    • Regenerative Medicine

    Background:

    • Myocardial ischemia remains a significant challenge in cardiovascular disease.
    • Existing revascularization techniques face limitations.
    • Transventricular approaches to create channels into ischemic myocardium are being investigated.

    Purpose of the Study:

    • To evaluate the feasibility and efficacy of using a high-energy CO2 laser to create channels between the ventricular cavity and ischemic myocardium.
    • To assess the patency and histological characteristics of laser-created channels.
    • To determine the protective effect of laser channels on ischemic heart tissue.

    Main Methods:

    • Mongrel dogs underwent ligation of the left anterior descending (LAD) coronary artery.

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  • Three experimental groups received transmyocardial laser revascularization (TMLR) using a CO2 laser.
  • A control group received LAD ligation without laser treatment.
  • Animals were sacrificed at varying intervals for autopsy and histological examination.

    • Main Results:

    • All control animals (n=6) died within 20 minutes of LAD ligation.
    • Animals treated with laser channels survived LAD ligation.
    • Autopsy revealed visible epicardial channels with demonstrated myocardial penetration.
    • Microscopic examination showed laser channels were patent and endothelialized.

    Conclusions:

    • Transmyocardial laser revascularization using a CO2 laser is a viable method for creating channels in ischemic myocardium.
    • Laser-created channels remain patent and endothelialized, suggesting they can persist.
    • These findings support the potential of laser channels to protect and nourish ischemic myocardium, warranting further investigation.