Short-latency Somatosensory Evoked Potentials in Patients with Brain Stem Tumor : Study of N_lt20gt and N_lt18gt Potentials
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概要
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Short-latency somatosensory evoked potentials (SSEPs) elicited by median nerve stimulation were studied in 17 patients with brain stem tumor. A total of 35 SSEP records were obtained and classified into five groups: 13 in Group I, central conduction time (CCT) lt 7.56 msec (within the normal limits); eight in Group II, CCT ≧ 7.56 msec; nine in Group III, N_lt20gt potential was abolished; four in Group IV, N_lt20gt and N_lt18gt potentials were abolished; and one in Group V, N_lt20gt, N_lt18gt, and P_lt14gt potentials were abolished. These SSEP groups were correlated with the size and location of the brain stem tumor on magnetic resonance images. N_lt20gt potentials were unchanged in latency in patients with small localized gadolinium (Gd)-enhanced lesions. In contrast, the N_lt20gt potentials were abolished in patients with tumors extending to the dorsal pons and the upper medulla oblongata. The extent of nonenhanced low-intensity lesion did not correlate with the changes of the N_lt20gt potentials. The degree of the impairment of the N_lt20gt potentials reflected the severity of the clinical symptoms. The N_lt20gt potential can evaluate brain stem dysfunction caused by brain stem tumor. The N_lt18gt potentials were abolished in four patients, in whom the tumor extension (one Gd-enhanced lesion, three low-intensity lesions) involved not only the pans but also the medulla oblongata. Therefore, the N_lt18gt potentials are probably generated from the medulla oblongata.
- 日本脳神経外科学会の論文
- 1997-07-15
著者
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福多 真史
新潟大学脳研究所脳神経外科学分野
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Suzuki Kenji
Department Of Cardiology Kyoto Second Red Cross Hospital
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TAMURA AKIRA
Department of Surgery, Omori Hospital, Toho University School of Medicine
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Suzuki Kenji
Department Of Neurosurgery Brain Research Institute Niigata University
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Suzuki Kenji
Department Of Applied Physics Osaka University
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YAMAZAKI Hidetoshi
Department of Immunology, School of Life Science Tottori University
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Yamazaki Hidetoshi
Department Of Neurosurgery Brain Research Institute Niigata University
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TANAKA Ryuichi
Department of Neurosurgery, Brain Research Institute, Niigata University
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KAMEYAMA Shigeki
Department of Neurosurgery, Epilepsy Center in National Nishi-Niigata Chuo Hospital
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FUKUDA Masafumi
Department of Neurosurgery, Brain Research Institute, Niigata University
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HONDA Yoshiho
Department of Neurosurgery, Brain Research Institute, Niigata University
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KAWAGUCHI Tadashi
Department of Neurosurgery, Brain Research Institute, Niigata University
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Honda Yoshiho
Department Of Neurosurgery Brain Research Institute Niigata University
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Tanaka Ryuichi
Department Of Neurosurgery Brain Research Institute Niigata University
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Kameyama Shigeki
Department Of Neurosurgery Epilepsy Center Nishi-niigata Chuou National Hospital
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Kameyama Shigeki
Department Of Neurosurgery Brain Research Institute Niigata University
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Kameyama Shigeki
Department Of Neurosurgery Brain Research Institute Niigata University
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Kameyama Shigeki
Department Of Neurosurgery Sannocho Hospital
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Kawaguchi Tadashi
Department Of Neurosurgery Brain Research Institute Niigata University
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Kameyama Shigeki
Department Of Functional Neuro-surgery
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Tamura Akira
Department Of Internal Medicine Ehime Prefectural Central Hospital
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Fukuda Masafumi
Department Of Neurosurgery Shibata Hospital
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Tamura Akira
Department Of Biochemistry Kyoto Pharmaceutical University
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Tamura Akira
Department Of Neurosurgery Brain Research Institute Niigata University
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Fukuda Masafumi
Department Of Neurosurgery Brain Research Institute Niigata University
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Tanaka Ryuichi
Department Of Liberal Arts Faculty Of Science And Technology Tokyo University Of Science
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Suzuki Kenji
Department Of Anesthesia Kitakami Saiseikai Hospital
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福多 真史
Department of Neurosurgery, Brain Research Institute, Niigata University
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