Prognosticating Study for Cervical Myelopathy Using Evoked Spinal Cord Potentials

Shinomiya, K.; Okamoto, A.; Komori, Hiromichi; Matsuoka, Tadashi; Yoshida, Hajime; Muto, Naoko; Furuya, K.

doi:10.1097/00007632-199010000-00013

Cited by 2 publications

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“…Amplitude attenuation of between 30 and 50% of the control value was defined as abnormal in the present study. However, some advocate a 50% amplitude decrease as the limit of normal [15]. An experimental investigation of ascending SCEP found that the spinal cord was unlikely to recover when the amplitude attenuation of the ascending SCEP exceeded 50% of the control value [3].…”

Section: Discussionmentioning

confidence: 99%

Spinal cord evoked potentials in cervical and thoracic myelopathy

Baba

Kawahara

Tomita

et al. 1993

International Orthopaedics

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We have studied 70 patients who underwent surgical decompression with or without fusion for cervical and/or thoracic myelopathy to assess the value of spinal cord evoked potentials (SCEP). The 70 patients included 42 with cervical spondylotic myelopathy, 10 with ossification of the posterior longitudinal ligament of the cervical spine and 18 with thoracic ligamentous ossification. Abnormal SCEP occurred in 88% of the patients with cervical myelopathy. Early recovery in intra- and postoperative SCEP was associated with a better result. The severity of myelopathy correlated significantly with an abnormal SCEP in thoracic myelopathy. SCEP may reflect the severity of disease, and early recovery of intraoperative SCEP may also predict neurological improvement.

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Section: Discussionmentioning

confidence: 99%

Spinal cord evoked potentials in cervical and thoracic myelopathy

Baba

Kawahara

Tomita

et al. 1993

International Orthopaedics

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“…There have been extensive studies in using SEP to assess and monitor Cervical Spondylotic Myelopathy (CSM). Common sites for electrical stimulation to detect CSM are the median, ulnar nerve and thoracic cord (Shinomiya et al, 1990;2000). SEP signals can be either recorded invasively or non-invasively (Nuwer and Dawson 1984).…”

Section: Detection Of Cervical Spondylotic Myelopathymentioning

confidence: 99%

“…Invasive recording requires insertion of electrode into the epidural space of the patients which can only be done intraoperatively under anaesthesia. Shinomiya et al (1990) reported that use of epidural electrode inserted into the cervical epidural space to record spinal cord somatosensory evoked potentials (SSEP) for localized-lesion diagnosis during surgery had excellent results. Tani et al (2000) used SSEP to assess the level of operation for CSM in the elderly in which single optimal level was identified in the study during microsurgical decompression and fusion.…”

Section: Detection Of Cervical Spondylotic Myelopathymentioning

confidence: 99%

“…Therefore, quantitative electrophysiological assessment is feasible to monitor the progress of compression of the cord and the nerve roots objectively (Bernhardt et al, 1993). Furthermore, Shinomiya et al (1990) reported that localized-lesion cases diagnosed by evoked spinal cord potentials showed excellent results significantly.…”

Section: Detection Of Cervical Spondylotic Myelopathymentioning

confidence: 99%

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Fast signal processing techniques for surface somatosensory evoked potentials measurement

Lam¹,

林成俊.²

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Somatosensory evoked potential (SEP) testing has been widely applied to intraoperative spinal cord integrity monitoring, diagnosis of various neurological disorders, and nerve conduction velocity measurements. However, the SEP recorded using surface electrodes is buried in noises that are both electrical and biological in nature. Hence, the noninvasive measurements of these potentials suffer from very poor signal-to-noise ratios (SNR). Some means of signal processing is required to extract SEP signal from strong background noise. The most commonly used technique of SEP extraction is ensemble averaging (EA). The conventional EA method usually requires several hundred to thousands of raw SEP input trials to produce an identifiable waveform for latency and amplitude measurement. This is time-consuming and may lead to the failure to detect the dynamic behaviour of the evoked potentials. Therefore, a fast and accurate SEP extraction technique is needed to reduce the measurement time. An adaptive Signal Enhancer (ASE) was applied to extract the weak and noisy SEP signal from anesthetized subjects during surgery. ASE has a self-learning ability in that the weights of the ASE are able to adjust according to each input trial. This ability makes the ASE suitable to track the noisy and time-varying SEP in fewer input trials than EA. The best estimation of the SEP signal can be obtained upon the Hong Kong, for their discussion, comments, advice and support throughout my M.Phil. study. I would also like to express my thanks Prof. Francis H. Y. Chan of the

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Prognosticating Study for Cervical Myelopathy Using Evoked Spinal Cord Potentials

Cited by 2 publications

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Spinal cord evoked potentials in cervical and thoracic myelopathy

Spinal cord evoked potentials in cervical and thoracic myelopathy

Fast signal processing techniques for surface somatosensory evoked potentials measurement

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