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New-onset refractory status epilepticus

Last edited: 4/14/2026

Overview

New-onset refractory status epilepticus (SE) is a neurological emergency characterized by prolonged seizures that do not respond to initial treatment with antiepileptic drugs, often requiring intensive care management 110.

Diagnosis

  • Clinical Presentation: Continuous or recurrent seizures lasting ≥30 minutes or multiple seizures without regaining full consciousness 115.
  • Electroencephalography (EEG): Essential for diagnosing non-convulsive SE 115.
  • Imaging: MRI or CT scans to rule out structural causes 118.
  • Laboratory Tests: Blood tests for metabolic derangements, including pyridoxine levels 11.

    • Management

  • First-Line Treatment:
    • - Benzodiazepines: Lorazepam or diazepam as initial therapy 110. - Phenytoin or Fosphenytoin: Following benzodiazepines, especially if SE persists 118.
  • Adjunctive Therapies:
    • - Second-Line Agents: If SE remains refractory, consider valproate, levetiracetam, or other antiepileptic drugs 110. - Induction of Coma: High-dose IV anti-seizure medications or sedation with propofol or thiopental for refractory cases 11920.
  • Special Considerations:
    • - Sedation vs. High-Dose Medication: Comparative trials suggest both approaches have roles but outcomes vary 1.

    Special Populations

  • Pediatrics: Management varies among pediatric neurology, emergency medicine, and intensive care specialists 2.
  • Elderly: Increased risk of systemic complications such as cardiac arrhythmias with fosphenytoin 18.
  • Comorbidities: Close monitoring for complications like disseminated intravascular coagulation, renal failure, and myoglobinuria 2930.

    • Key Recommendations

  • Initiate treatment with benzodiazepines (e.g., lorazepam) as first-line therapy for SE (Evidence: Strong 110).
  • Transition to phenytoin or fosphenytoin if SE persists despite benzodiazepines (Evidence: Strong 110).
  • For refractory cases, consider deep sedation with propofol or thiopental under intensive care monitoring (Evidence: Moderate 1920).
  • Evaluate and manage potential metabolic causes, including pyridoxine deficiency, especially in refractory cases (Evidence: Moderate 11).
  • Tailor management strategies based on patient-specific factors such as age and comorbidities (Evidence: Expert opinion 218).

    • References

    1 Cornwall CD, Piilgaard H, Engedal TS, Olsen HT, Møller K, Krøigård T et al.. Fast Acute Sedation at Intensive Care vs. High-Dose IV Anti-seizure Medication for Treatment of Non-convulsive Status Epilepticus: A Randomized, Multicenter Trial. Critical care explorations 2025. link 2 Dedeoglu Ö, Akça H, Emeksiz S, Kartal A, Kurt NÇ. Management of Status Epilepticus by Different Pediatric Departments: Neurology, Intensive Care, and Emergency Medicine. European neurology 2023. link 3 Durrani T, Haq MAU, Ishaq H, Fatima T, Khan A. Crossed Cerebellar Diaschisis in a Child with Status Epilepticus. Journal of the College of Physicians and Surgeons--Pakistan : JCPSP 2021. link 4 Scicluna VM, Biros M, Harney DK, Jones EB, Mitchell AR, Pentz RD et al.. Patient and Surrogate Postenrollment Perspectives on Research Using the Exception From Informed Consent: An Integrated Survey. Annals of emergency medicine 2020. link 5 Caronna E, Vilaseca A, Maria Gràcia Gozalo R, Sanchez Corral A, Santafé M, Sueiras M et al.. Long-term prognosis related to deep sedation in refractory status Epilepticus. Acta neurologica Scandinavica 2020. link 6 Sutter R, Tisljar K, Opić P, De Marchis GM, Bassetti S, Bingisser R et al.. Emergency management of status epilepticus in a high-fidelity simulation: A prospective study. Neurology 2019. link 7 Woolfall K, Roper L, Humphreys A, Lyttle MD, Messahel S, Lee E et al.. Enhancing practitioners' confidence in recruitment and consent in the EcLiPSE trial: a mixed-method evaluation of site training - a Paediatric Emergency Research in the United Kingdom and Ireland (PERUKI) study. Trials 2019. link 8 Sutter R, Dittrich T, Semmlack S, Rüegg S, Marsch S, Kaplan PW. Acute Systemic Complications of Convulsive Status Epilepticus-A Systematic Review. Critical care medicine 2018. link 9 Perna SJ, Rhinewalt JM, Currie ER. Seizing the Opportunity: Exploring Barriers to Use of Transmucosal Midazolam in Hospice Patients. Journal of palliative medicine 2018. link 10 Alvarez V, Rossetti AO. Monotherapy or Polytherapy for First-Line Treatment of SE?. Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society 2016. link 11 Dave HN, Eugene Ramsay R, Khan F, Sabharwal V, Irland M. Pyridoxine deficiency in adult patients with status epilepticus. Epilepsy & behavior : E&B 2015. link 12 Govindarajan P, Dickert NW, Meeker M, De Souza N, Harney D, Hemphill CJ et al.. Emergency research: using exception from informed consent, evaluation of community consultations. Academic emergency medicine : official journal of the Society for Academic Emergency Medicine 2013. link 13 Durkalski V, Silbergleit R, Lowenstein D. Challenges in the design and analysis of non-inferiority trials: a case study. Clinical trials (London, England) 2011. link 14 Rami A, Kim M, Niquet J. Translocation of the serine protease Omi/HtrA2 from mitochondria into the cytosol upon seizure-induced hippocampal injury in the neonatal rat brain. Neurochemical research 2010. link 15 Shah AM, Vashi A, Jagoda A. Review article: Convulsive and non-convulsive status epilepticus: an emergency medicine perspective. Emergency medicine Australasia : EMA 2009. link 16 Droney J, Hall E. Status epilepticus in a hospice inpatient setting. Journal of pain and symptom management 2008. link 17 Lewena S, Young S. When benzodiazepines fail: how effective is second line therapy for status epilepticus in children?. Emergency medicine Australasia : EMA 2006. link 18 Adams BD, Buckley NH, Kim JY, Tipps LB. Fosphenytoin may cause hemodynamically unstable bradydysrhythmias. The Journal of emergency medicine 2006. link 19 Sackey PV, Martling CR, Radell PJ. Three cases of PICU sedation with isoflurane delivered by the 'AnaConDa'. Paediatric anaesthesia 2005. link 20 van Gestel JP, Blussé van Oud-Alblas HJ, Malingré M, Ververs FF, Braun KP, van Nieuwenhuizen O. Propofol and thiopental for refractory status epilepticus in children. Neurology 2005. link 21 Michelson-Kerman M, Watemberg N, Nissenkorn A, Gilad E, Sadeh M, Lerman-Sagie T. Muscle glycogen depletion and increased oxidative phosphorylation following status epilepticus. Journal of child neurology 2003. link 22 Ogawa K, Kanemoto K, Shirasaka Y, Kawasaki J, Yamasaki S. Acute pancreatic damage associated with convulsive status epilepticus: a report of three cases. Psychiatry and clinical neurosciences 2001. link 23 Ding M, Haglid KG, Hamberger A. Quantitative immunochemistry on neuronal loss, reactive gliosis and BBB damage in cortex/striatum and hippocampus/amygdala after systemic kainic acid administration. Neurochemistry international 2000. link00139-4) 24 Sood AK, Yadav SP, Sood S. Endosulphan poisoning presenting as status epilepticus. Indian journal of medical sciences 1994. link 25 Tunik MG, Young GM. Status epilepticus in children. The acute management. Pediatric clinics of North America 1992. link38405-x) 26 Dinner DS, Lueders H, Lederman R, Gretter TE. Aphasic status epilepticus: a case report. Neurology 1981. link 27 Morris HH. Lidocaine: a neglected anticonvulsant?. Southern medical journal 1979. link 28 Hamilton NG, Matthews T. Aphasia: the sole manifestation of focal status epilepticus. Neurology 1979. link 29 Singhal PC, Chugh KS, Gulati DR. Myoglobinuria and renal failure after status epilepticus. Neurology 1978. link 30 Fischer SP, Lee J, Zatuchni J, Greenberg J. Disseminated intravascular coagulation in status epilepticus. Thrombosis and haemostasis 1977. link 31 Bentley G, Mellick R. Chlormethiazole in status epilepticus--three cases. The Medical journal of Australia 1975. link

    Original source

    1. [1]
      Fast Acute Sedation at Intensive Care vs. High-Dose IV Anti-seizure Medication for Treatment of Non-convulsive Status Epilepticus: A Randomized, Multicenter Trial. — Cornwall CD, Piilgaard H, Engedal TS, Olsen HT, Møller K, Krøigård T et al. Critical care explorations (2025)
    2. [2]
      Management of Status Epilepticus by Different Pediatric Departments: Neurology, Intensive Care, and Emergency Medicine. — Dedeoglu Ö, Akça H, Emeksiz S, Kartal A, Kurt NÇ European neurology (2023)
    3. [3]
      Crossed Cerebellar Diaschisis in a Child with Status Epilepticus. — Durrani T, Haq MAU, Ishaq H, Fatima T, Khan A Journal of the College of Physicians and Surgeons--Pakistan : JCPSP (2021)
    4. [4]
      Patient and Surrogate Postenrollment Perspectives on Research Using the Exception From Informed Consent: An Integrated Survey. — Scicluna VM, Biros M, Harney DK, Jones EB, Mitchell AR, Pentz RD et al. Annals of emergency medicine (2020)
    5. [5]
      Long-term prognosis related to deep sedation in refractory status Epilepticus. — Caronna E, Vilaseca A, Maria Gràcia Gozalo R, Sanchez Corral A, Santafé M, Sueiras M et al. Acta neurologica Scandinavica (2020)
    6. [6]
      Emergency management of status epilepticus in a high-fidelity simulation: A prospective study. — Sutter R, Tisljar K, Opić P, De Marchis GM, Bassetti S, Bingisser R et al. Neurology (2019)
    7. [7]
      Enhancing practitioners' confidence in recruitment and consent in the EcLiPSE trial: a mixed-method evaluation of site training - a Paediatric Emergency Research in the United Kingdom and Ireland (PERUKI) study. — Woolfall K, Roper L, Humphreys A, Lyttle MD, Messahel S, Lee E et al. Trials (2019)
    8. [8]
      Acute Systemic Complications of Convulsive Status Epilepticus-A Systematic Review. — Sutter R, Dittrich T, Semmlack S, Rüegg S, Marsch S, Kaplan PW Critical care medicine (2018)
    9. [9]
      Seizing the Opportunity: Exploring Barriers to Use of Transmucosal Midazolam in Hospice Patients. — Perna SJ, Rhinewalt JM, Currie ER Journal of palliative medicine (2018)
    10. [10]
      Monotherapy or Polytherapy for First-Line Treatment of SE? — Alvarez V, Rossetti AO Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society (2016)
    11. [11]
      Pyridoxine deficiency in adult patients with status epilepticus. — Dave HN, Eugene Ramsay R, Khan F, Sabharwal V, Irland M Epilepsy & behavior : E&B (2015)
    12. [12]
      Emergency research: using exception from informed consent, evaluation of community consultations. — Govindarajan P, Dickert NW, Meeker M, De Souza N, Harney D, Hemphill CJ et al. Academic emergency medicine : official journal of the Society for Academic Emergency Medicine (2013)
    13. [13]
      Challenges in the design and analysis of non-inferiority trials: a case study. — Durkalski V, Silbergleit R, Lowenstein D Clinical trials (London, England) (2011)
    14. [14]
      Translocation of the serine protease Omi/HtrA2 from mitochondria into the cytosol upon seizure-induced hippocampal injury in the neonatal rat brain. — Rami A, Kim M, Niquet J Neurochemical research (2010)
    15. [15]
      Review article: Convulsive and non-convulsive status epilepticus: an emergency medicine perspective. — Shah AM, Vashi A, Jagoda A Emergency medicine Australasia : EMA (2009)
    16. [16]
      Status epilepticus in a hospice inpatient setting. — Droney J, Hall E Journal of pain and symptom management (2008)
    17. [17]
      When benzodiazepines fail: how effective is second line therapy for status epilepticus in children? — Lewena S, Young S Emergency medicine Australasia : EMA (2006)
    18. [18]
      Fosphenytoin may cause hemodynamically unstable bradydysrhythmias. — Adams BD, Buckley NH, Kim JY, Tipps LB The Journal of emergency medicine (2006)
    19. [19]
      Three cases of PICU sedation with isoflurane delivered by the 'AnaConDa'. — Sackey PV, Martling CR, Radell PJ Paediatric anaesthesia (2005)
    20. [20]
      Propofol and thiopental for refractory status epilepticus in children. — van Gestel JP, Blussé van Oud-Alblas HJ, Malingré M, Ververs FF, Braun KP, van Nieuwenhuizen O Neurology (2005)
    21. [21]
      Muscle glycogen depletion and increased oxidative phosphorylation following status epilepticus. — Michelson-Kerman M, Watemberg N, Nissenkorn A, Gilad E, Sadeh M, Lerman-Sagie T Journal of child neurology (2003)
    22. [22]
      Acute pancreatic damage associated with convulsive status epilepticus: a report of three cases. — Ogawa K, Kanemoto K, Shirasaka Y, Kawasaki J, Yamasaki S Psychiatry and clinical neurosciences (2001)
    23. [23]
      Quantitative immunochemistry on neuronal loss, reactive gliosis and BBB damage in cortex/striatum and hippocampus/amygdala after systemic kainic acid administration. — Ding M, Haglid KG, Hamberger A Neurochemistry international (2000)
    24. [24]
      Endosulphan poisoning presenting as status epilepticus. — Sood AK, Yadav SP, Sood S Indian journal of medical sciences (1994)
    25. [25]
      Status epilepticus in children. The acute management. — Tunik MG, Young GM Pediatric clinics of North America (1992)
    26. [26]
      Aphasic status epilepticus: a case report. — Dinner DS, Lueders H, Lederman R, Gretter TE Neurology (1981)
    27. [27]
      Lidocaine: a neglected anticonvulsant? — Morris HH Southern medical journal (1979)
    28. [28]
      Aphasia: the sole manifestation of focal status epilepticus. — Hamilton NG, Matthews T Neurology (1979)
    29. [29]
      Myoglobinuria and renal failure after status epilepticus. — Singhal PC, Chugh KS, Gulati DR Neurology (1978)
    30. [30]
      Disseminated intravascular coagulation in status epilepticus. — Fischer SP, Lee J, Zatuchni J, Greenberg J Thrombosis and haemostasis (1977)
    31. [31]
      Chlormethiazole in status epilepticus--three cases. — Bentley G, Mellick R The Medical journal of Australia (1975)
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