title: A Comparison of Interside Asymmetries of Lower Extremity Somatosensory Evoked Potentials in Anesthetized Patients with Unilateral Lumbosacral Radiculopathy.
abstract: METHODS
  Prospective cohort study.
  
  
  OBJECTIVE
  This study was to investigate interside asymmetries of three lower extremity somatosensory evoked potentials (SSEPs) in anesthetized patients with unilateral lumbosacral radiculopathy.
  
  
  BACKGROUND
  Although interside asymmetry is an established criterion of abnormal SSEP, little is known which of the lower SSEPs is more sensitive in detecting interside asymmetry in anesthetized patients.
  
  
  METHODS
  Superficial peroneal nerve SSEP (SPN-SSEP), posterior tibial nerve SSEP (PTN-SSEP), and sural nerve SSEP were obtained in 31 lumbosacral surgery patients with unilateral lumbosacral radiculopathy, and compared with a group of 22 control subjects.
  
  
  RESULTS
  The lumbosacral group showed significant larger interside asymmetry ratios of P37 latencies in SPN-SSEP and PTN-SSEP, and significant larger interside asymmetry ratio of P37-N45 amplitude in SPN-SSEP, when comparing with the control group. Within the lumbosacral group but not the control group, SPN-SSEP displayed significant larger interside asymmetry ratio in P37 latency. When referencing to the control group, more patients in the lumbosacral group displayed abnormal interside SPN-SSEP latency asymmetries which corroborated the symptom laterality.
  
  
  CONCLUSIONS
  The data suggested that SPN-SSEP was more sensitive in detecting interside latency asymmetry in anesthetized patients.
authors.affiliation: Department of Audiology and Speech Pathology, Bloomsburg University of Pennsylvania, Bloomsburg, PA, USA.
authors.forename: Qing
authors.initials: Q
authors.lastname: Yue
authors.affiliation: Department of Neurophysiology, Geisinger Health System, Danville, PA, USA.
authors.forename: Tyson
authors.initials: T
authors.lastname: Hale
authors.affiliation: Department of Neurophysiology, Geisinger Health System, Danville, PA, USA.
authors.forename: Aaron
authors.initials: A
authors.lastname: Knecht
keywords: Posterior tibial nerve; Radiculopathy; Somatosensory evoked potential; Superficial peroneal nerve; Sural nerve