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Safety factor for electrostimulation with nanosecond pulses.

Christian W Zemlin1

  • 1Division of Cardiothoracic Surgery, Washington University School of Medicine, Campus Box 8234, 660 S Euclid Ave, St. Louis, MO 63110, USA.

Bioelectrochemistry (Amsterdam, Netherlands)
|July 18, 2021
PubMed
Summary

Electrical stimulation with nanosecond pulses can cause electroporation. This study analytically derives thresholds, finding a reduced safety factor when pulse duration and membrane time constant are below the minimum required sustain time for stimulation.

Keywords:
ElectroporationElectrostimulationIon channel gating dynamicsNanosecond pulsesSafety factor

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Area of Science:

  • Biophysics
  • Cellular Electrophysiology

Background:

  • Electrical stimulation parameters influence cellular effects like electroporation.
  • Nanosecond pulses present unique challenges, often causing electroporation even without stimulation.

Purpose of the Study:

  • To analytically derive stimulation and electroporation thresholds based on a proposed model.
  • To analyze the safety factor for electrical stimulation and its dependence on pulse parameters.
  • To explore implications for cardiac applications and experimental validation.

Main Methods:

  • Analytical derivation of stimulation and electroporation thresholds.
  • Mathematical modeling of membrane potential dynamics.
  • Analysis of the safety factor as a function of pulse duration, membrane charging time constant, and minimum sustain time (tmin).

Main Results:

  • Derived analytical thresholds for stimulation and electroporation.
  • Identified that the safety factor is significantly reduced when pulse duration and membrane charging time constant are less than tmin.
  • The model explains electroporation occurring without stimulation under specific conditions.

Conclusions:

  • The derived model provides a theoretical framework for understanding nanosecond pulse stimulation and electroporation.
  • The safety factor is critically dependent on the relationship between pulse duration, membrane time constant, and tmin.
  • Further experimental validation is needed to test the model's predictions, particularly for cardiac applications.