Neurological · Topic 14 of 23
Status Epilepticus
A seizure lasting more than 5 minutes triggers a neurological emergency where every additional minute of uncontrolled activity increases the risk of permanent brain damage.
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Status Epilepticus
Seizing 5 minutes or more, or back to back. A benzodiazepine goes in first.
Two monitor traces, movement and EEG. At first both show seizure: the body jerks and the EEG spikes. Then the movement trace goes flat, the jerking has stopped, but the EEG keeps spiking and the patient still does not respond. The seizure goes on, and only a continuous EEG shows it: nonconvulsive status epilepticus.
- Convulsing: the body jerks, the EEG spikesNurse seesrhythmic jerking, no responseNurse doesside, oxygen, time it; benzodiazepine at 5 minutes
- The jerking stops, but the EEG keeps spikingNurse seesstill — but not waking upNurse doesdon't assume it's over; check responsiveness
- Still seizing: only a continuous EEG shows itNurse seesconfused or unresponsive well after convulsions stopNurse doessuspect nonconvulsive status; report — continuous EEG
or repeated seizures without waking between · treat now, before lasting brain injury begins
0.1 mg/kg (max 4 mg), repeat once · no IV → IM midazolam — never delay it for a vein
hypoglycemia is a reversible cause — treated at the same time as the benzodiazepine
What causes it
TriggersAsk first about missed or stopped antiseizure doses — a common trigger
Treatment: against the clock
In this orderAt 5 minutes, a benzodiazepine — never delay it hunting for IV access
IV lorazepam 0.1 mg/kg (max 4 mg), repeat once if still seizing. No IV: IM midazolam 10 mg (adults over 40 kg) — at least as effective.
Never delay it for IV accessLoad one IV drug: fosphenytoin (or phenytoin), levetiracetam or valproate — about equally effective.
Still seizing after a benzodiazepine and a second-line drug: a continuous infusion plus intubation.
More detail
Monitor throughout
Airway · breathingComplications
Watch forNursing priorities
In orderStill seizing — or refractory?
Don't confuse| Still seizing after | A benzodiazepine (even two doses) |
|---|---|
| Next | Load a second-line IV drug |
| Drugs | Fosphenytoin, levetiracetam or valproate |
Teach your patient
Patient and familyAt 5 minutes, give the benzodiazepine. No IV is never a reason to wait — IM midazolam works.
Sources · Status Epilepticus (StatPearls) · AES convulsive status epilepticus algorithm · Ativan injection label (DailyMed) · ESETT trial (Lancet) · Cerebyx injection label (DailyMed) · Refractory status epilepticus (J Neurocrit Care) · Midazolam injection label (DailyMed) · RAMPART trial (NEJM 2012) · CDC: First Aid for Seizures · Films: the NurseSavvy learning-flow visuals. Follow your facility's status epilepticus protocol.
Status Epilepticus
A seizure lasting more than 5 minutes triggers a neurological emergency where every additional minute of uncontrolled activity increases the risk of permanent brain damage. The clock starts immediately.
Status epilepticus (SE) is defined as continuous seizure activity lasting 5 minutes or longer, or two or more seizures without return to baseline consciousness between them. This is a medical emergency because prolonged neuronal firing causes excitotoxic brain injury, hyperthermia, rhabdomyolysis, metabolic acidosis, and respiratory failure. The first-line intervention is a benzodiazepine — IV lorazepam (0.1 mg/kg, max 4 mg per dose) or IM midazolam if no IV access. Benzodiazepines should be administered within the first 5 minutes. If seizures continue after two benzodiazepine doses, second-line agents include IV fosphenytoin, valproate, or levetiracetam. Nursing priorities during SE follow ABCs: maintain airway (position on side, suction as needed), administer oxygen, establish IV access, monitor continuous pulse oximetry and cardiac rhythm, and track seizure duration precisely. Never force anything into the mouth. Check fingerstick glucose — hypoglycemia is a reversible cause that must be ruled out immediately. After the event, monitor for postictal neurological deficits, aspiration, and elevated creatine kinase from muscle breakdown.
Key Distinctions
Don't confuse the 5-minute threshold for SE with a typical self-limiting seizure (1–2 minutes) — a seizure at 3 minutes is not yet SE but demands close monitoring. Students mix up lorazepam (first-line IV for SE) with phenytoin (second-line) — benzos come first, always. SE can be convulsive or nonconvulsive; a patient with prolonged confusion or unresponsiveness and subtle or absent motor activity may still have nonconvulsive SE confirmed on EEG.
Clinical Pearl
Five minutes, not five steps: if the seizure hits 5 minutes, push the benzo. Time the seizure from the start — your documentation of onset time drives every treatment decision.
Knowledge Check
3 quick questions on the must-knows for this topic.
A seizure lasting how long defines status epilepticus?
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