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Targeted tissue ablation with nanosecond pulses.

Gary Long, Peter K Shires, David Plescia

    IEEE Transactions on Bio-Medical Engineering
    |February 15, 2011
    PubMed
    Summary
    This summary is machine-generated.

    High voltage nanosecond pulses effectively induce liver cell death in vivo without damaging surrounding tissues. This non-thermal effect, with a threshold electric field of 12-15 kV/cm, shows potential for liver tumor treatments.

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    Area of Science:

    • Biomedical Engineering
    • Oncology
    • Electroporation

    Background:

    • Investigating novel therapeutic approaches for liver tumors.
    • Understanding the biophysical effects of high voltage pulses on biological tissues.

    Purpose of the Study:

    • To evaluate the efficacy of nanosecond high voltage pulses in inducing cell death in liver tissue.
    • To determine the threshold electric field for cell death.
    • To assess the thermal and mechanical effects of these pulses.

    Main Methods:

    • In-vivo porcine liver studies utilizing nanosecond high voltage pulses.
    • Three-dimensional finite element modeling to determine threshold electric fields.
    • Pennes' bioheat equation modeling for temperature distribution analysis.

    Main Results:

    • Cell death was induced in defined liver tissue volumes without collagen damage.
    • The threshold electric field for cell death was determined to be 12-15 kV/cm for 30-100 ns pulses.
    • The lethal effect was non-thermal, and muscle contractions were significantly reduced compared to microsecond pulses.

    Conclusions:

    • High voltage nanosecond pulses reliably induce cell death in normal liver cells in vivo.
    • These findings suggest potential applications for nanosecond pulse technology in liver tumor therapy.
    • The non-thermal mechanism and reduced muscle contractions offer advantages over existing methods.