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Optimized Conditions for Electrical Tissue Stimulation with Biphasic, Charge-Balanced Impulses.

Zhengwu Sun1, Payel Sen1,2, Jules Hamers1,2

  • 1Walter-Brendel-Centre of Experimental Medicine, LMU Klinikum, Ludwig-Maximilians-University, 81377 München, Germany.

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Achieving full charge balance in electrical stimulation is crucial for long-term cell culture. This study presents a method to ensure charge balance, preserving myocardial tissue function and contractility.

Keywords:
biphasiccharge balancefield stimulationliving myocardial slicetissue culture

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Area of Science:

  • * Bioelectronics and electrophysiology
  • * Tissue engineering and regenerative medicine
  • * Electrochemistry and materials science

Background:

  • * Continuous electrical stimulation is vital for excitable cell culture but poses electrochemical risks.
  • * Electrode material properties and stimulation impulse characteristics significantly influence outcomes.
  • * Minimizing harmful electrochemical consequences is essential for successful long-term cultivation.

Purpose of the Study:

  • * To develop an accessible method for analyzing the electrochemical impact of biphasic current-controlled impulses.
  • * To identify optimal stimulation conditions for long-term myocardial tissue cultivation.
  • * To evaluate the efficacy of different charge balancing techniques.

Main Methods:

  • * Employed a colorimetric assay using phenol red as a redox indicator to detect electrochemical changes.
  • * Analyzed biphasic, current-controlled impulses delivered via graphite electrodes.
  • * Tested manual calibration, capacitive electrode coupling, and feedback regulation for charge balance.
  • * Assessed myocardial tissue contractility and visual integrity after 10 days of culture.

Main Results:

  • * The colorimetric assay detected charge deviations as low as ±0.2%.
  • * Phenol red exhibited minimal degradation (20% over 24 h) with fully charge-balanced impulses.
  • * Charge-balanced stimulation maintained over 80% of porcine left ventricular myocardium contractility.
  • * Stimulation with charge imbalances (2-4%) led to tissue weakening and discoloration.

Conclusions:

  • * Full charge balance in electrical stimulation is critical for maintaining the viability and function of cultured myocardial tissue.
  • * Feedback regulation of electrode polarization offers superior control and biological benefits compared to capacitive coupling.
  • * The developed phenol red assay provides a sensitive tool for optimizing electrochemical stimulation parameters.