• Sanghyun Han, Yong Chul Kwon, Sung-Min Kim, Seung-Jae Hyun, Tae-Ahn Jahng, Ki-Jeong Kim, Hyun-Jib Kim, Ho Yong Choi, Young-Seop Park, and Seok Park Kyung K Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, Korea..
• Department of Neurosurgery, Chungnam National University Hospital, Chungnam National University College of Medicine, DaeJeon, Korea.
• World Neurosurg. 2018 Nov 1; 119: e235-e243.

ObjectiveThe aim of this study is to determine the risk factors affecting intraoperative neurophysiologic monitoring (IONM) changes, when such changes take place, and clinical outcomes associated with IONM change during cervical open door laminoplasty (COL) for cervical compressive myelopathy.MethodsBetween 2010 and 2015, 79 patients who underwent COL with IONM recording were studied. Changes in motor evoked potentials or somatosensory evoked potentials over an alarm criterion were defined as IONM change. Patients with IONM change were assigned to the alarm group, and the others were classified as the control group. Baseline data and radiographic measurements were compared between the 2 groups. Radiologic parameters including maximal compression level (MCL), area and diameter of the spinal canal and ventral compressive lesion, stenosis grade, and occupying ratio of area (ORA) and length at the MCL were measured with magnetic resonance imaging.ResultsThirteen patients were assigned to the alarm group and 66 patients were assigned to the control group. Multivariate analysis identified ORA at the MCL (odds ratio, 1.520; 95% confidence interval, 1.192-1.37; P = 0.001) as an independent risk factor for IONM change. Immediately after decompression, the IONM change occurred. One of 4 patients who did not fully recover from the IONM change had postoperative motor deficits.ConclusionsIONM change during COL occurred immediately after decompression, and a risk factor of IONM change was ORA at the MCL. If the IONM change was not fully recovered, a new motor deficit occurred after COL.Copyright © 2018 Elsevier Inc. All rights reserved.

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