Risk Factor Analysis of Change in Intraoperative Neurophysiologic Monitoring During Cervical Open Door Laminoplasty
January 14, 2019
SanghyunHan1Yong ChulKwon2Sung-MinKim3Seung-JaeHyun4Tae-AhnJahng4Ki-JeongKim4 Hyun-JibKim4Ho YongChoi5Young-SeopPark6KyungSeok Park2
Highlights
- • Few studies have documented IONM change during COL in detail.
- • IONM change during COL occurred immediately after decompression.
- • The risk factor for IONM change was more than 34.5% ORA at the MCL.
- • If the IONM change did not fully recover, new motor deficits occurred after COL.
Objective
The 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.
Methods
Between 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.
Results
Thirteen 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.
Conclusions
IONM 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.
https://www.sciencedirect.com/
