{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T16:01:45Z","timestamp":1787760105806,"version":"build-2784847793"},"reference-count":40,"publisher":"American Medical Association (AMA)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Neurol"],"published-print":{"date-parts":[[2026,6,1]]},"abstract":"\n Importance<\/jats:title>\n Seizure-induced brain injury is central to the treatment urgency of new-onset refractory status epilepticus (NORSE). Identifying biomarkers that reflect ongoing neuronal damage could inform therapeutic timing and improve outcomes.<\/jats:p>\n <\/jats:sec>\n \n Objective<\/jats:title>\n To quantify acute brain injury in patients with cryptogenic NORSE (cNORSE), etiology-defined status epilepticus (eSE), and chronic epilepsy.<\/jats:p>\n <\/jats:sec>\n \n Design, Setting, and Participants<\/jats:title>\n This was an international cross-sectional study conducted between 2013 and 2025. Patients were enrolled at 36 hospitals in the US, 2 in Canada, and 1 in Italy, France, and Belgium. Patients with cNORSE and eSE for which biological samples were obtained during ongoing seizure activity were enrolled in the study. Comparison groups without status epilepticus comprised individuals with chronic epilepsy and healthy participants. None were excluded.<\/jats:p>\n <\/jats:sec>\n \n Exposures<\/jats:title>\n Neurofilament light chain (NfL) and S100-beta (S100B) protein concentrations in serum and cerebrospinal fluid (CSF).<\/jats:p>\n <\/jats:sec>\n \n Main Outcomes and Measures<\/jats:title>\n Degree of neuronal and glial damage, indexed by NfL and S100B levels, and their association with short-term functional outcomes.<\/jats:p>\n <\/jats:sec>\n \n Results<\/jats:title>\n \n A total of 78 patients with cNORSE (mean [95% CI] age, 37 [30-41] years; 44 female [56%]) and 2 independent cohorts of 211 patients (mean [95% CI] age, 69 [66-71] years; 128 female [61%]) and 73 patients (mean [95% CI] age, 56 [45-65] years; 39 male [53%]) with eSE were included. NfL concentrations were markedly elevated in cNORSE\u2014approximately 10-fold higher in CSF and 4-fold higher in serum\u2014compared with the eSE cohorts (CSF: median [IQR], 6408 [1503-22\u202f963] pg\/mL compared with 694 [219-2389] pg\/mL; serum: median [IQR], 231 [99-855] pg\/mL compared with 55 [20-135] pg\/mL;\n P<\/jats:italic>\n &amp;lt;.001). Serum NfL levels were nearly 20-fold higher in cNORSE than in the cohort with epilepsy and in healthy controls (median [IQR], 11 [7-19 ] and 7 [5-14 ] pg\/mL, respectively). Serum and CSF NfL levels were strongly correlated (Spearman \u03c1\u2009=\u20090.75;\n P<\/jats:italic>\n \u2009&amp;lt;\u2009.001) and rose sharply between week 1 (median [IQR], 101 [51-137] pg\/mL), week 2 (median [IQR], 197 [117-324] pg\/mL), and week 3 (median [IQR], 598 [163-1000] pg\/mL) after onset (\n P<\/jats:italic>\n \u2009&amp;lt;\u2009.001). In contrast, S100B concentrations did not differ between groups and showed no consistent temporal pattern. NfL discriminated cNORSE from eSE (area under the receiver operating characteristic curve [AUROC], 0.79; 95% CI, 0.68-0.90) and from cohorts without status epilepticus (AUROC, 0.99; 95% CI, 0.78-1.00). Higher serum NfL was independently associated with poor functional outcome at discharge (Glasgow Outcome Scale extended score, 1-4; odds ratio, 1.01; 95% CI, 1.00-1.03;\n P<\/jats:italic>\n \u2009=\u2009.03).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusions and Relevance<\/jats:title>\n Results of this cross-sectional study suggest that acute neuroaxonal injury, as reflected by elevated NfL levels, was substantially greater in cNORSE than in the cohorts with eSE and in controls without status epilepticus. The rapid early rise in NfL highlights a narrow therapeutic window, emphasizing the need for prompt, effective, and potentially neuroprotective interventions in cNORSE.<\/jats:p>\n <\/jats:sec>","DOI":"10.1001\/jamaneurol.2026.0865","type":"journal-article","created":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T15:30:45Z","timestamp":1777303845000},"page":"563","source":"Crossref","is-referenced-by-count":6,"title":["Acute Brain Injury in New-Onset Refractory Status Epilepticus and Etiology-Defined Status Epilepticus"],"prefix":"10.1001","volume":"83","author":[{"given":"Stefano","family":"Meletti","sequence":"first","affiliation":[{"name":"Epilepsy Center and Neurophysiology Unit, Modena Academic Hospital, Modena, Italy"},{"name":"Department of Biomedical, Metabolic, and Neural Sciences, University of Modena and Reggio Emilia (UNIMORE), Modena, 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