Turkish Neurosurgery 2021 , Vol 31 , Num 1
Differences in Electrophysiologic Values between Preoperative and Intraoperative Neurophysiologic Monitoring
Da-sol KIM1,Ha-Young CHOI2,Gi-Wook KIM1,Jeong-Hwan SEO1,Yu Hui WON1
1Jeonbuk National University Medical School and Research Institute of Clinical Medicine of Jeonbuk National University ? Biomedical Research Institute of Jeonbuk National University Hospital, Department of Physical Medicine and Rehabilitation, Jeonju, South Korea
2Jeonbuk National University Medical School, Department of Neurosurgery, Jeonju, South Korea
3Rehabailitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea
DOI : 10.5137/1019-5149.JTN.28409-19.2 AIM: To compare preoperative and intraoperative electrophysiologic values in patients who underwent brain and spine surgeries.

MATERIAL and METHODS: A retrospective medical record review was conducted on patients who underwent brain and spine surgery between January 2014 and July 2018. Patients underwent preoperative electrophysiologic monitoring within a week before the operation and intraoperative monitoring during the surgery. Monitoring parameters included the onset latency (msec) and amplitude (mV) of motor evoked potential (MEP), somatosensory evoked potential (SEP), electroneuronography, and brainstem auditory evoked potential (BAEP).

RESULTS: The latency of the MEP and SEP were significantly prolonged while the amplitude was decreased during operation. Specifically, patients with abnormal findings in their preoperative assessments showed more prominent differences compared to those with normal findings. However, there was no significant difference between preoperative and intraoperative results based on which side of the hemisphere was affected or unaffected. Unlike the MEP and SEP parameters, there were no significant changes in the facial electroneuronography and BAEP parameters.

CONCLUSION: There were differences in the preoperative and intraoperative monitoring parameters. Further studies are necessary to understand the underlying mechanisms behind these changes during surgery. Keywords : Intraoperative neurophysiologic monitoring, Motor evoked potential, Somatosensory evoked potential, Brain stem auditory evoked potential, Electroneuronography

Corresponding author : Yu Hui WON, wonyh@jbnu.ac.kr