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Imbalanced biphasic electrical stimulation: muscle tissue damage.

A Scheiner1, J T Mortimer, U Roessmann

  • 1Applied Neural Control Laboratory, Case Western Reserve University, Cleveland, Ohio 44106.

Annals of Biomedical Engineering
|January 1, 1990
PubMed
Summary
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Imbalanced biphasic stimulation allows higher safe charge densities in cat skeletal muscle than monophasic stimulation. This suggests electrochemical damage mechanisms can be mitigated by specific pulse configurations, improving electrical stimulation safety.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Muscle Physiology

Background:

  • Electrical stimulation of skeletal muscle is crucial for therapeutic applications.
  • Understanding tissue damage thresholds is vital for safe and effective stimulation protocols.
  • Previous studies indicate limitations with monophasic and balanced biphasic stimulation.

Purpose of the Study:

  • To investigate the safety limits of imbalanced biphasic stimulation in cat skeletal muscle.
  • To compare the safe charge densities of imbalanced biphasic stimulation with monophasic stimulation.
  • To elucidate the underlying mechanisms of tissue damage during electrical stimulation.

Main Methods:

  • Cat skeletal muscles were stimulated using intramuscular coiled wire electrodes.

Related Experiment Videos

  • A regulated current source delivered controlled electrical stimuli.
  • Imbalanced biphasic, balanced biphasic, and monophasic stimulation protocols were applied.
  • Tissue tolerance thresholds were assessed based on net direct current (DC) density.

    • Main Results:

    • Imbalanced biphasic stimulation was safely tolerated at net DC current densities up to 35 microA/mm2.
    • Monophasic stimulation was safe up to 10 microA/mm2 and unsafe above 20 microA/mm2.
    • Higher safe average current densities were observed with imbalanced biphasic stimulation compared to monophasic.

    Conclusions:

    • Imbalanced biphasic stimulation permits higher safe cathodic charge densities than monophasic or balanced biphasic stimulation.
    • pH changes are unlikely to be the primary cause of tissue damage.
    • Anodic pulses can reverse cathodic stimulation damage, even with lower charge, suggesting complex electrochemical interactions.