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The American Clinical Neurophysiology Society introduced the concept of a clearly discernible inter-discharge interval between consecutive waveforms (i.e., t2). As this definition was not applied to what have previously been termed triphasic waves and in some cases of lateralized periodic discharges, we propose reconsideration of terminology that includes historical use of definitions. This will allow the development and usage of the concept for periodic EEG patterns as <jats:italic>any runs of stereotyped paroxysmal waveforms separated by nearly identical intervals and prolonged\u00a0repetitive\u00a0complexes on the EEG<\/jats:italic>. Prolonged expression means EEG is recorded for a sufficient period of time to prove that the pattern is repetitive, thus resulting in a monomorphic\/monotonous pattern. More important than the inter-discharge interval (t2), periodic EEG patterns occur at time regular intervals (T). As a result, periodic EEG activity should be considered along a continuum and not the opposite of rhythmic EEG activity where no interval activity exists between consecutive waveforms.<\/jats:p>","DOI":"10.1007\/s00415-023-11835-7","type":"journal-article","created":{"date-parts":[[2023,7,1]],"date-time":"2023-07-01T16:01:37Z","timestamp":1688227297000},"page":"4744-4752","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Determining ICU EEG periodic patterns and why it matters"],"prefix":"10.1007","volume":"270","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9296-1957","authenticated-orcid":false,"given":"Philippe","family":"G\u00e9lisse","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4536-3791","authenticated-orcid":false,"given":"William O.","family":"Tatum","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2203-1938","authenticated-orcid":false,"given":"Arielle","family":"Crespel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierre","family":"Jallon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter W.","family":"Kaplan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2023,7,1]]},"reference":[{"issue":"4","key":"11835_CR1","doi-asserted-by":"publisher","first-page":"328","DOI":"10.1097\/wnp.0000000000000319","volume":"33","author":"WO Tatum","year":"2016","unstructured":"Tatum WO, Olga S, Ochoa JG, Munger Clary H, Cheek J, Drislane F et al (2016) American Clinical Neurophysiology Society Guideline 7: guidelines for EEG reporting. 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Dr. Tatum has received a stipend from Elsevier as Editor-in-Chief of Epilepsy Behavior Report. He serves on the editorial board for the Journal of Clinical Neurophysiology and Epilepsy Behavior Reports. He is a consultant for BioSerenity\/DigiTrace Care Services, Inc., Neurelis, Natus, and LivaNova and holds patents or patents pending for intraoperative monitoring devices (#62527896; #62770362). He receives royalties for publishing from Demos Publishers Inc., Springer Publishing, Wiley, and MedLink and honoraria for speaking engagements from the American Academy of Neurology, American Epilepsy Society, and American Clinical Neurophysiology Society (ACNS). He has research support from Mayo Clinic, Martin Family Foundation, Eisai Inc., LivaNova, Xenon Pharma, Cerevel Therapeutics, and McElvey Foundation. Dr. Crespel received support for teaching programs from UCB, Eisai and royalties for publishing from John Libbey Eurotext. She was an advisory board member for Eisai-France. Dr. Jallon reports no conflicts of interest. Dr. Kaplan has been on the board of the American Board of Clinical Neurophysiology, the American Clinical Neurophysiology Society, consulted for Ceribell and lectured on EEG.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflicts of interest"}}]}}