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Related Experiment Videos

Evoked potential changes in ischaemic myelopathy.

J Kalita1, A K Srivastava, P Mittal

  • 1Department of Neurology, Sanjay Gandhi PGIMS, Lucknow.

Electromyography and Clinical Neurophysiology
|July 3, 2003
PubMed
Summary

Motor evoked potentials (MEP) show greater utility than somatosensory evoked potentials (SEP) in assessing spinal cord ischemia during surgery. MEPs helped document and predict outcomes in pediatric patients experiencing paraplegia after aortic coarctation repair.

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Area of Science:

  • Neurophysiology
  • Intraoperative Monitoring
  • Pediatric Neurology

Background:

  • Somatosensory evoked potentials (SEP) are standard for intraoperative monitoring.
  • Limited data exists on motor evoked potentials (MEP) for spinal cord ischemia.
  • Assessing neurological function during aortic surgery is critical.

Observation:

  • Two pediatric patients developed paraplegia post-aortic coarctation repair.
  • Aortic cross-clamping times were 100 min and 30 min.
  • Neurological deficits correlated with clamping duration and MEP findings.

Findings:

  • The patient with 100 min clamping had flaccid paraplegia and unrecordable lower limb MEPs.
  • The patient with 30 min clamping had spastic paraparesis, prolonged CMCT, and improved.

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  • Tibial SEPs were normal in both cases, suggesting MEPs are more sensitive.

    • Implications:

    • MEP may be superior to SEP for documenting and prognosticating ischemic myelopathy.
    • MEP monitoring can guide surgical decisions and predict neurological recovery.
    • This study highlights MEPs' value in high-risk pediatric spinal cord surgery.