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Related Experiment Videos

Improved neuromonitoring during spinal surgery using double-train transcranial electrical stimulation.

H L Journée1, H E Polak, M de Kleuver

  • 1Department of Orthopaedics, Sint Maartenskliniek, Nijmegen, The Netherlands. h.l.journee@nchir.azg.nl

Medical & Biological Engineering & Computing
|February 24, 2004
PubMed
Summary

Double-train stimulation (DTS) enhances motor evoked potentials (MEPs) during spinal cord monitoring. This technique improves MEP responses, especially when single-train stimulation (STS) yields inadequate results.

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Area of Science:

  • Neuroscience
  • Clinical Neurophysiology

Background:

  • Motor evoked potentials (MEPs) are crucial for intra-operative spinal cord monitoring.
  • Transcranial electrical stimulation (TES) can sometimes yield insufficient MEP responses.

Purpose of the Study:

  • To introduce and evaluate a novel double-train stimulation (DTS) technique.
  • To assess the efficacy of DTS in enhancing MEP responses for spinal cord monitoring.

Main Methods:

  • An MEP monitoring system was adapted for DTS.
  • MEP responses from 160 anterior tibial muscles were analyzed under propofol/remifentanil/O2/N2O anesthesia.
  • Stimulation involved a preconditioning pulse train followed by a multipulse transcranial electrical stimulus.

Main Results:

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  • DTS magnified 83% of low-amplitude single-train stimulation (STS) MEPs (below 100 microV) to over 100 microV.
  • The mean logarithmic magnification factor for low-amplitude MEPs was 15.5.
  • A mean logarithmic facilitation factor of 2.4 was observed for MEPs with amplitudes above 100 microV.

Conclusions:

  • Double-train TES stimulation significantly facilitates MEP responses compared to single-train stimulation.
  • The facilitation is most pronounced when initial STS responses are small or absent.
  • DTS is a valuable preconditioning technique for improving MEP monitoring reliability.