[Clinical and experimental studies on ascending cauda equina action potential (A-CEAP) in lumbar lesion with reference to positivisation].
The phenomenon of positivisation in ascending cauda equina action potential (A-CEAP) was evaluated in 114 patients with lumbosacral lesions. These patients were divided into two groups, i.e., non-positivisation and positivisation group. In the former, positive wave ratio was highest at the L5/S upon stimulating the peroneal nerve. In the latter, the positivisation at the L4/5 upon stimulating the peroneal nerve spread not only to the cranial level but also to the caudal-L5/S level. Based on these experimental results, the factors causing positivisation in the L5/S level without lesion were: 1) curving effect of the L5 nerve root, 2) augmentation of current density within the spinal canal and 3) the amount of individual impulses propagating along the L5 and S1 root.
Nakamura
H
H
Department of Orthopaedic Surgery, Osaka City University, Medical School, Japan.
D000200:Action Potentials; D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D002415:Cats; D002420:Cauda Equina / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000150:complications / Q000503:physiopathology*; D008159:Lumbar Vertebrae; D008161:Lumbosacral Region; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011892:Rana catesbeiana; D013117:Spinal Cord Compression / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D013130:Spinal Stenosis / Q000150:complications / Q000503:physiopathology*