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Arterial aneurysm model using laser energy.

R S Hartz, W J McCarthy, J LoCicero

    The Journal of Surgical Research
    |August 1, 1987
    PubMed
    Summary
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    Pulsed CO2 laser injury to arteries can cause aneurysms, particularly in smaller vessels. Further research is needed before clinical use of laser arterial anastomosis.

    Area of Science:

    • Vascular surgery
    • Biomedical engineering
    • Laser medicine

    Background:

    • Continuous wavelength laser energy is used for arterial anastomoses.
    • Existing studies report a high incidence of anastomotic aneurysm formation.

    Purpose of the Study:

    • To elucidate the mechanism of aneurysm production after laser injury.
    • To establish a model for studying laser-induced arterial aneurysms.

    Main Methods:

    • Controlled arterial wall injuries were created using a pulsed CO2 laser beam (40-50 mW) in rabbit carotid and femoral arteries.
    • Contralateral vessels served as sham controls.
    • Vessels were examined for patency and aneurysm formation 8-11 weeks post-injury.

    Main Results:

    Related Experiment Videos

    • All 40 arteries remained patent.
    • Aneurysm formation was observed in 1 of 10 carotid arteries (laser group) and 8 of 10 femoral arteries (laser group).
    • Histology revealed medial necrosis and internal elastic lamina fragmentation in aneurysmal vessels.

    Conclusions:

    • Pulsed CO2 laser injury can induce arterial aneurysm formation, characterized by medial necrosis.
    • Smaller femoral arteries showed a higher incidence of aneurysms compared to larger carotid arteries, possibly due to a greater relative injury area.
    • Further investigation is warranted before clinical application, especially for vessels < 2 mm in diameter.