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Transcranial stimulation parameters to elicit motor evoked potentials.

S S Haghighi1

  • 1Department of Clinical Neurophysiology, Sharp Memorial Hospital, San Diego, California 92123, USA. siavash.haghigh@sharp.com

Electromyography and Clinical Neurophysiology
|December 29, 2006
PubMed
Summary

Repetitive transcranial electrical stimulation is most effective for activating motor cortex during spine surgery. This method significantly enhances motor responses compared to single or paired pulse stimulation under anesthesia.

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Area of Science:

  • Neurosurgery
  • Neurophysiology

Background:

  • Transcranial electrical stimulation (TES) is a technique used to modulate cortical excitability.
  • Activating the motor cortex is crucial for monitoring descending motor tracts during complex surgeries like spinal procedures.

Purpose of the Study:

  • To compare the effectiveness of single, paired, and repetitive transcranial electrical stimulation (TES) in activating the motor cortex.
  • To determine the optimal TES method for intraoperative motor pathway monitoring during spine surgery.

Main Methods:

  • Ten patients undergoing spine surgery provided consent for the study.
  • Muscle action potentials from the abductor pollicis brevis were measured following cortical stimulation.
  • Latency and amplitude of evoked potentials were analyzed for different TES paradigms.

Main Results:

  • Repetitive TES elicited significantly more responses than single-pulse TES (p=0.0001).
  • Paired-pulse TES also showed a significant increase in responses compared to single-pulse TES (p=0.0191).
  • Repetitive TES was more effective than paired-pulse TES (p=0.0253), with no significant changes in latency or amplitude based on interstimulus interval or pulse number.

Conclusions:

  • Intraoperative repetitive transcranial electrical stimulation (TES) is the most effective method for activating descending motor tracts.
  • This finding supports the use of repetitive TES for enhanced neurophysiological monitoring during spine surgery under anesthesia.