title: Success rate of motor evoked potentials for intraoperative neurophysiologic monitoring: effects of age, lesion location, and preoperative neurologic deficits.
abstract: Transcranial electrical stimulation with myogenic motor evoked potential (MEP) recording was used for intraoperative neurophysiologic monitoring in 341 consecutive "high-risk" neurosurgical or orthopedic procedures. Overall, the success rate for establishing reliable MEP response was 94.8% for upper extremities and 66.6% for lower extremities. The rate was only 39.1% for lower extremities in patients with preoperative motor deficit and up to 81% in neurologically intact adults. Further analysis demonstrated that extremes of age or the presence of a lesion in the spinal cord and motor deficit contributed to failure in obtaining reliable MEPs.
authors.affiliation: Department of Neurology, New York University School of Medicine, New York, NY, USA.
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Djordje
authors.initials: D
authors.lastname: Sterio
authors.forename: Xu
authors.initials: X
authors.lastname: Ming
authors.forename: Devaki D
authors.initials: DD
authors.lastname: Para
authors.forename: Marri
authors.initials: M
authors.lastname: Butusova
authors.forename: Teresa
authors.initials: T
authors.lastname: Tong
authors.forename: Aleksandar
authors.initials: A
authors.lastname: Beric
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D002493:Central Nervous System Diseases / Q000473:pathology* / Q000503:physiopathology* / Q000601:surgery; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography / Q000379:methods; D004576:Electromyography; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D015203:Reproducibility of Results; D012189:Retrospective Studies; D050781:Transcranial Magnetic Stimulation