2019 Volume 37 Issue 1 Pages 38-50
Recently, the development of digital EEG technology has enabled us to visualize EEG activities of wider frequency bands in addition to conventional 'Berger bands'. We could record the low frequency activities below 1 Hz and also the high frequency activities above 200 Hz, and utilize such novel information as DC shift (infra-slow) and high frequency oscillations (HFO). Both activities have been found in epileptogenic areas, and have received much attention as new surrogate biomarkers of epileptic focus. However, the definition and methods of recoding/analysis have not been well established so that it would be difficult to compare previous reports from various institutes. Previously the standardization of clinical practice parameter in recording and analysis of ictal DC shifts and ictal HFOs was proposed based on multi-institutional collaborative study about wide-band EEG analysis of ictal electrocorticogram by AMED (J. Jpn. Epil. Soc. 2017; 35: 3-13). We are now presenting the revised proposal by adding and rectifying several points after the collaboration of several academic societies of clinical neuroscience in Japan.