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Abstract Details

Monitoring Superficial Peroneal Nerve Somatosensory Evoked Potential during L4-5 Lumbar Root Decompression
Clinical Neurophysiology
S59 - (-)
004
Post-tibial nerve Somatosensory evoked potential (PTN-SSEP) often fails to document the individual nerve root dysfunction; whereas dermatomal somatosensory evoked potential (DSSEP) can be difficult to obtain in anesthetized patients.
Thirty five consecutive patients who underwent lumbar root microdecompression were reviewed. The control group consisted of fifteen patients who underwent anterior cervical discectomy and fusion (ACDF). Data from 35 patients undergoing SP-SSEP, PTN-SSEP, and sural nerve SSEP (SN-SSEP) monitoring during lumbar surgeries were analyzed and compared to the control group of 15 patients underwent ACDF surgery.
Cortical SPN-SSEP could be readily recorded in over 90% patients from both groups. The waveforms of SPN-SSEP were about 30% smaller than PTN-SSEP, but very similar to SN-SSEP. Importantly, SPN-SSEP was capable of detecting intraoperative L4-5 root dysfunction without the corresponding PTN-SSEP or SN-SSEP alterations. Overall, SPN-SSEP displayed two-fold greater positivity over PTN-SSEP or SN-SSEP.
SPN-SSEP was a more sensitive measure for intraoperative L4-5 nerve root dysfunction in comparison to PTN-SSEP and SN-SSEP.
Authors/Disclosures

PRESENTER 		No disclosure on file
No disclosure on file
Timothy L. Vollmer, MD, FAAN The institution of Dr. Vollmer has received personal compensation in the range of $5,000-$9,999 for serving as a Consultant for Biogen IDEC. The institution of Dr. Vollmer has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for Genentech/Roche. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Siranax. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Celgene. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for EMD Serono. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Bristol Meyers Squib. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Viela Bios. The institution of Dr. Vollmer has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Novartis. The institution of Dr. Vollmer has received research support from Rocky Mountain MS Center. The institution of Dr. Vollmer has received research support from Biogen. The institution of Dr. Vollmer has received research support from Actelion. The institution of Dr. Vollmer has received research support from Genentech/Roche. The institution of Dr. Vollmer has received research support from Anokion. The institution of Dr. Vollmer has received research support from TG Therapeutics.