Recent advances in somatosensory evoked potentials (SEPs) and somatosensory evoked magnetic fields (SEFs)

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  • 体性感覚誘発電位と体性感覚誘発脳磁場の最近の進歩
  • タイセイ カンカク ユウハツ デンイ ト タイセイ カンカク ユウハツ ノウ ジバ ノ サイキン ノ シンポ

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We present the comparison of somatosensory evoked potentials (SEPs) and somatosensory evoked magnetic fields (SEFs) following median nerve stimulation. We describe new knowledge about a magnetic M15 component and its electric counterpart, P15 both of which reflect action potentials traveling along the thalamocortical fibers, and about somatic 600 Hz high frequency oscillations. Also, we mention that middle and long latency SEPs derived from the primary somatosensory cortex are modified by the difference in interstimulus intervals and that the middle and long latency SEP waveforms change into a crescendo pattern but do not disappear when N20 is lost or equivocal in patients developing dysfunction of the peripheral or central somatosensory pathways. Thus, we propose that bilateral disappearance of the middle and long latency SEPs under an appropriate recording condition is essential to confirm a severe brain damage such as a hypoxic ischemic encephalopathy when N20 is equivocal or lost.

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