O1-6-12. Cauda equina conduction time as a test for lumber spinal stenosis

Publication date: September 2017
Source:Clinical Neurophysiology, Volume 128, Issue 9
Author(s): Fumiaki Okada, Syunsuke Kumanishi, Kazuki Kusuyama
We examined the cauda equina conduction time (CECT) in 20 patients (11 male), average age, 73years, low back pain therapy criterion score of Japan orthopaedic Association (JOA score), 17 points, and Oswestry Disability Index (ODI), 19 points and aged matched 17 healthy volunteers. Magnetic Augmented Translumbosacral Stimulation (MTATS) at L1 and S1 levels elicited a compound muscle action potential (CMAP) recordable from bilateral abductor hallucis muscle. We calculated the CECT as the difference between the latencies of CAMPs elicited by stimulation at L1 and S1 level. We divided the patients into the two groups, A group with a longer CECT (average, 7.4ms) and B group with a shorter CECT (average, 5.2ms). Statistical analyses of CECT showed a significant difference between the A group and healthy volunteers, a significant negative correlation with JOA score and a tendency to increase with a higher point of ODI. In conclusion, CECT using MATS coil serves usefully in physiologic assessments of lumbar canal spinal stenosis.



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