Time-critical stepped seizure protocol: immediate airway/oxygen/glucose check, first-line IV benzodiazepines at 5 minutes, second-line non-sedating AEDs at 10–20 minutes, and general anesthetic induction at 30 minutes for refractory status.
A new seizure or Status Epilepticus (SE)—defined as continuous seizure activity lasting ≥ 5 minutes or ≥ 2 discrete seizures without complete interictal recovery—is a time-critical neurological emergency. Prolonged epileptic activity causes permanent excitotoxic neuronal injury, pharmacoresistance (GABA receptor internalization and NMDA receptor upregulation), hyperthermia, rhabdomyolysis, and autonomic collapse requiring stepped, protocol-driven treatment.
Caution
Dangerous Diagnosis Not to Miss: Refractory Nonconvulsive Status Epilepticus (NCSE: subtle gaze preference or twitching in an unresponsive patient), Acute Severe Hyponatremia ([Na+] < 120 mEq/L), Acute Intracranial Hemorrhage, and CNS Infection (bacterial meningitis / viral encephalitis).
Status epilepticus: terminate seizures, protect physiology, find the cause
Treat at 5 minutes: adequate benzodiazepine dosing, prompt validated second-line therapy and EEG-guided escalation are more important than serial under-dosing.
Airway, Breathing, Circulation: Place in lateral recovery position if non-intubated; deliver 100% O2 via non-rebreather mask; obtain immediate IV access.
Fingerstick Glucose: If < 70 mg/dL, administer 50 mL of D50W (plus 100 mg IV thiamine in chronic alcohol use).
Draw Stat Labs: Serum electrolytes (Na+, K+, Ca2+, Mg2+), venous/arterial blood gas, antiepileptic drug (AED) levels, and toxicology screen.
IV Access Available: IV Lorazepam 4 mg IV bolus (0.1 mg/kg) over 2 minutes (can repeat once in 5–10 min) OR IV Diazepam 10 mg IV (0.15–0.2 mg/kg).
No IV Access: IM Midazolam 10 mg (for weight > 40 kg; 5 mg for 13–40 kg) OR Rectal Diazepam 10–20 mg.
CRITICAL PRINCIPLE: Do NOT underdose benzodiazepines; giving subtherapeutic 1–2 mg lorazepam is the single most common cause of early treatment failure.
Administer one of three guideline-recommended IV AEDs over 10–15 minutes (ESETT Trial: equal ~50% efficacy):
IV Levetiracetam (Keppra): 60 mg/kg IV (maximum 4500 mg) over 10 minutes.
IV Fosphenytoin: 20 mg PE/kg IV (maximum 1500 mg PE) at 150 mg PE/min with continuous cardiac/BP monitoring.
IV Valproate Sodium: 40 mg/kg IV (maximum 3000 mg) over 10 minutes (avoid in acute liver failure or suspected mitochondrial disease).
Alternative: IV Lacosamide 200–400 mg IV over 5–10 minutes.
Caution
Common Diagnostic Trap: Assuming status epilepticus has stopped because visible motor jerking has abated following sedatives or paralysis. Persistent electrographic seizures may continue; EEG—preferably continuous when refractory SE, persistent coma, or recurrent seizures are concerns—is needed to confirm seizure control.
Status Epilepticus: ESETT trial analysis, continuous EEG patterns, and super-refractory protocols.
Altered Consciousness: Coma recovery and postictal states.
Severe Sodium Disorders: 3% hypertonic saline bolus protocols for hyponatremic seizures.
Severe TBI: Post-traumatic seizure prophylaxis and ICP management.
Intracranial Hemorrhage: Seizure-related hematoma expansion and control.
Evidence status
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From urgent 'AEIOU' indication screening and modality selection to vascular access, dosing, and anticoagulation.
From 'analgesia-first' multimodal pain control and light sedation targeting to daily SAT/SBT coordination, delirium screening, and early mobility.
From acute GCS drop and herniation emergency measures to emergent CT, neurocritical intervention, and death by neurologic criteria determination.
From emergent first-line benzodiazepine administration to second-line IV non-sedating AEDs and continuous cEEG anesthetic burst suppression.
Recognition and time-sensitive escalation of care for prolonged or repeated seizures.
ARAS neuroanatomy, structural vs toxic-metabolic coma, the comprehensive Coma Exam (pupils, cold calorics, posturing), FOUR score, and CAM-ICU delirium.
Monro-Kellie doctrine, ICP waveforms (P2>P1, Lundberg A-waves), CPP targets (60–70 mmHg), herniation syndromes, and the 4-tier BTF management protocol.
Tonicity assessment, etiologic classification, 3% hypertonic saline bolus protocols, individualized ODS-safe correction limits, DDAVP relowering, DI diagnostics, and evidence-aware hypernatremia correction.
Severe TBI neurocritical care: prevent hypoxemia/hypotension, treat intracranial hypertension, individualize ventilation/CPP, use evidence-based short antiseizure prophylaxis when chosen, and escalate surgery when indicated.
Spontaneous ICH vs Aneurysmal SAH, INTERACT-2/ATACH-2 blood pressure targets, emergency anticoagulant reversal, ENRICH minimally invasive evacuation, ISAT coiling, and Nimodipine for delayed cerebral ischemia.