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Seizures: Classification01:13

Seizures: Classification

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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Antiepileptic Drugs: Potassium Channel Activators01:20

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Ezocgabine or retigabine, an antiepileptic drug of remarkable efficacy, has revolutionized the management of seizures. It is a potassium channel activator, explicitly targeting the family of Q subtype potassium channels. It enhances the transmembrane potassium currents, regulating neuronal excitability. This action stabilizes the resting membrane potential, a pivotal factor in mitigating the hyperexcitability that characterizes epilepsy.
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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
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Oxygen toxicity seizure mimics.

Kevin Foley1, Neil Banham1,2, Samantha Bonnington1

  • 1Department of Hyperbaric Medicine, Fiona Stanley Hospital, Perth, Australia.

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|June 22, 2021
PubMed
Summary

Seizure-like activity during hyperbaric oxygen treatment (HBOT) may not always be oxygen toxicity seizures (OTS). Other conditions, known as OTS mimics, can cause seizures, necessitating careful diagnosis to avoid serious harm.

Keywords:
BrainClinical auditHyperbaric oxygen treatmentHyperbaric researchNeurologyRecompressionRisk factors

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Area of Science:

  • Hyperbaric Medicine
  • Neurology
  • Emergency Medicine

Background:

  • Seizures during hyperbaric oxygen treatment (HBOT) are typically attributed to central nervous system oxygen toxicity (CNS-OT).
  • However, other conditions can present with seizure-like activity, mimicking CNS-OT.
  • Misdiagnosis of seizure causes during HBOT can lead to significant patient harm.

Purpose of the Study:

  • To identify and highlight conditions that mimic oxygen toxicity seizures (OTS) during HBOT.
  • To emphasize the importance of considering alternative diagnoses in patients experiencing seizures under HBOT.
  • To reduce the risk of morbidity and mortality associated with misdiagnosing seizure etiologies in HBOT.

Main Methods:

  • A retrospective review of medical records was conducted.
  • Patients experiencing seizures during HBOT between November 1989 and June 2020 were analyzed.
  • The study aimed to identify non-CNS-OT causes of seizure activity.

Main Results:

  • Four cases of "OTS mimics" were identified.
  • These included posterior reversible encephalopathy syndrome, pethidine toxicity, epilepsy secondary to subarachnoid hemorrhage, and severe hypoglycemia.
  • These conditions presented with seizure-like activity during HBOT.

Conclusions:

  • Diagnosis of apparent oxygen toxicity seizures (OTS) during HBOT requires caution.
  • Multiple pathologies can mimic the signs and symptoms of CNS-OT.
  • A pragmatic diagnostic approach, considering underlying pathologies, is crucial for patients with seizure-like activity during HBOT.