Use of Central Motor Conduction Time and Spinal Cord Evoked Potentials in the Electrophysiological Assessment of Compressive Cervical Myelopathy

A retrospective study. This study investigated the pathophysiology of compressive cervical myelopathy (CCM) with prolonged central motor conduction time (CMCT) in the upper limbs (ULs) rather than lower limbs (LLs) and prolonged CMCT at the thoracic level (TL). Earlier reports indicated the usefulne...

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Bibliographic Details
Published in:Spine (Philadelphia, Pa. 1976) Pa. 1976), 2017-06, Vol.42 (12), p.895-902
Main Authors: Fujimoto, Kazuhiro, Kanchiku, Tsukasa, Imajo, Yasuaki, Suzuki, Hidenori, Funaba, Masahiro, Nishida, Norihiro, Taguchi, Toshihiko
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Cervical Vertebrae - surgery
Evoked Potentials, Motor
Female
Humans
Laminoplasty
Lower Extremity - innervation
Male
Middle Aged
Neural Conduction
Prognosis
Retrospective Studies
Spinal Cord - physiopathology
Spinal Cord Compression - diagnosis
Spinal Cord Compression - physiopathology
Spinal Cord Compression - surgery
Thoracic Vertebrae
Upper Extremity - innervation
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Summary:A retrospective study. This study investigated the pathophysiology of compressive cervical myelopathy (CCM) with prolonged central motor conduction time (CMCT) in the upper limbs (ULs) rather than lower limbs (LLs) and prolonged CMCT at the thoracic level (TL). Earlier reports indicated the usefulness of CMCT to assess preoperative CCM severity. However, little information exists on patients with prolonged CMCT-UL rather than CMCT-LL and prolonged CMCT-TL. Ninety-four patients (61 men, 33 women; age 28-87 years) with CCM who underwent cervical laminoplasty participated. Fifty-three volunteers provided normal data on CMCT-UL and LL. CMCT-TL was calculated as CMCT-LL - CMCT-UL. We defined three groups: group U, prolonged CMCT-UL rather than CMCT-LL (n = 14); group E, prolonged CMCT-UL and CMCT-LL equality (n = 43); and group L, prolonged CMCT-TL (n = 37). We evaluated intraoperative recording of spinal cord evoked potentials (SCEPs), neurological findings, and surgical outcomes. Control mean CMCT-UL was 5.2 ± 0.7 ms, CMCT-LL was 11.8 ± 1.1 ms, and CMCT-TL was 6.6 ± 1.2 ms. SCEPs results were significantly different between CCM patients in group U and L (P 
ISSN:0362-2436
1528-1159
DOI:10.1097/BRS.0000000000001939