Erfan Bashar
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Status Epilepticus

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Educational scope notice: This is a study note for medical students, not medical advice, diagnosis, or treatment guidance. Clinical management should follow local protocols and current guidelines. Drug dosing below is intentionally omitted; exact regimens follow local protocols.

Status epilepticus is a seizure that will not stop on its own: 5 minutes of continuous activity, or two or more seizures without full recovery of consciousness between them. The 5-minute mark matters because most seizures self-terminate earlier, and beyond it the machinery of termination is failing. A second mark at 30 minutes signals rising risk of lasting neuronal injury in convulsive status. Time points for other status forms lack supporting data. Most cases are convulsive and unmistakable. Non-convulsive status epilepticus can be easy to miss: a comatose patient with no motor activity whose brain continues to seize on EEG. Any unexplained coma in the emergency department deserves an EEG for exactly this reason. Without it the condition is misread as a postictal state, sedation, or metabolic encephalopathy.

Why it kills

A seizing patient does not breathe effectively. Prolonged activity produces hypoxia and anoxia, injuring neurons within minutes. Ventilation runs as a parallel priority from the first minute rather than an afterthought. Common causes set the recurrence risk and must be treated alongside the seizure itself. They include drug non-adherence or withdrawal in known epilepsy, acute metabolic derangements such as hyponatraemia, hypoglycaemia, and hypocalcaemia, acute structural lesions including stroke and haemorrhage, CNS infections, and drug toxicity.

Phased treatment

Stabilize first. Confirm activity with EEG where possible, check airway, breathing, and circulation, and obtain venous access. Then work through escalating drug classes. Each phase assumes the previous mechanism has been maximally exploited. Exact doses and timings vary by protocol and follow the local emergency protocol.

First-line therapy is a benzodiazepine. Rapid administration depresses respiration toward arrest and trades one hypoxic mechanism for another. When benzodiazepines have maximally enhanced GABA-A function and failed, second-line therapy switches mechanism: intravenous levetiracetam, phenytoin or fosphenytoin, or valproate. Levetiracetam may be quicker to give with fewer adverse effects. Seizures persisting past this point define refractory status. The patient is sedated, typically with propofol or another anaesthetic agent, intubated, and ventilated to protect the brain from anoxia. Phenobarbital or anaesthesia at this stage stays under expert control. Continuous EEG monitoring is required under sedation. Anaesthesia can mask ongoing electrographic seizures, and the endpoint is electrical silence, not merely a still patient.

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