Status Epilepticus
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Direct answer
Five minutes of continuous seizure activity — or two or more seizures without recovery of consciousness between them — now defines status epilepticus; the older 30-minute definition described neuronal injury rather than the operational treatment threshold. Management is staged and time-bound: a benzodiazepine first (intravenous lorazepam 0.1 mg per kg, or intramuscular midazolam, or intravenous diazepam if lorazepam is unavailable), then a second-line antiseizure medication (levetiracetam, sodium valproate, phenytoin or fosphenytoin), then anaesthetic infusion with intubation for refractory status — while the cause is treated in parallel.
What you must remember
- First five minutes: airway, oxygen, IV access, check glucose immediately (give thiamine before glucose in suspected thiamine deficiency or alcohol use disorder), send electrolytes, calcium, magnesium and antiseizure drug levels.
- First-line benzodiazepine: IV lorazepam 4 mg (0.1 mg per kg), repeated once after 5 to 10 minutes if seizures continue; IM midazolam 10 mg when IV access is absent; inadequate initial benzodiazepine dosing is the commonest management error.
- Second-line at 5 to 20 minutes: a loading dose of levetiracetam, sodium valproate or phenytoin or fosphenytoin; choice is guided by cause, comorbidities and availability; phenytoin needs cardiac monitoring and is ineffective in toxin-driven seizures.
- Refractory status (seizures beyond about 40 minutes): anaesthetic doses of midazolam, propofol or thiopentone with intubation, continuous EEG monitoring, and ICU care.
- Always hunt the cause: antiseizure medication non-adherence or withdrawal (commonest in known epilepsy), alcohol withdrawal, stroke, CNS tumour, neurocysticercosis (common in India), meningitis or encephalitis, hyponatraemia, hypoglycaemia, uraemia and drug toxicity.
- Specific antidote situations: eclampsia gets magnesium sulphate, not a benzodiazepine; isoniazid toxicity gets pyridoxine; toxin-induced seizures are treated with the antidote rather than phenytoin.
- Suspect non-convulsive status in any unexplained coma with subtle twitching or eye deviation — diagnosis is by EEG.
The first thirty minutes at the bedside
A 34-year-old known epileptic is brought in convulsing; the family ran out of tablets four days ago. At minute zero, manage airway, oxygen and IV access, and check glucose immediately — giving thiamine before glucose if alcohol use disorder is suspected. Between minutes 0 and 5, give IV lorazepam 0.1 mg per kg (4 mg in a typical adult), repeated once after 5 to 10 minutes if seizures continue; if no vein exists, intramuscular midazolam 10 mg is the fastest-absorbed alternative. Inadequate initial benzodiazepine dosing is the commonest real-world error — an under-dosed patient arrives at hospital still seizing. If seizures persist past 5 to 20 minutes, load a second-line drug: levetiracetam, sodium valproate or phenytoin or fosphenytoin, guided by cause and comorbidity — phenytoin demands cardiac monitoring and does nothing for toxin-driven seizures. Beyond about 40 minutes, refractory status calls for anaesthetic infusion of midazolam, propofol or thiopentone with intubation, continuous EEG and ICU care. In parallel, hunt the cause in an Indian adult: antiseizure drug withdrawal (commonest in known epilepsy), alcohol withdrawal, neurocysticercosis, stroke, meningoencephalitis, hyponatraemia, hypoglycaemia. Two special situations decide whole questions — eclampsia gets magnesium sulphate, not a benzodiazepine, and isoniazid toxicity gets pyridoxine.
How NEET-PG frames status epilepticus
The definitional question (why five minutes, not thirty) and the sequencing question (which drug, which route, which minute) carry most of the marks, and option sets are deliberately built from misordered sequences. The mimics matter too: psychogenic non-epileptic seizures show variable, non-stereotyped motor activity with eyes closed and preserved pupillary reflexes, and do not respond to benzodiazepines — though when in doubt, treat as status. Among drugs, know why IV lorazepam beats IV diazepam (longer antiseizure duration, less redosing), and that absence status — prolonged confusion with generalised spike-and-wave on EEG — is treated with benzodiazepines and valproate or ethosuximide, not anaesthesia. Any unexplained coma with subtle twitching or eye deviation deserves an EEG for non-convulsive status.
Frequently asked questions
How is status epilepticus defined operationally?
Continuous seizure activity of five minutes or longer, or recurrent seizures without regaining baseline; thirty minutes marks the onset of neuronal injury.
Which benzodiazepine is preferred first-line?
Intravenous lorazepam 0.1 mg per kg (about 4 mg in adults), repeated once after 5 to 10 minutes; intramuscular midazolam when IV access is absent.
What are the second-line drugs?
Loading doses of levetiracetam, sodium valproate or phenytoin or fosphenytoin, chosen by cause and circumstance.
What is the commonest cause in a known epileptic?
Abrupt withdrawal of or non-adherence to antiseizure medication, followed by alcohol withdrawal, metabolic derangement and acute CNS insults.
Why is magnesium sulphate the drug of eclampsia?
It treats the pre-eclampsia pathophysiology driving the seizures and prevents recurrence better than diazepam or phenytoin.
What is non-convulsive status epilepticus?
Ongoing electrographic seizures without major convulsions — unexplained coma or fluctuating confusion with subtle twitching — diagnosed on EEG.