8.1 Pediatric Status Epilepticus: Definition, Etiologies & Time-Critical Algorithm

Pediatric Convulsive Status Epilepticus

Quick Answer: Treat ongoing bilateral tonic-clonic activity at 5 minutes, including recurrent convulsions without recovery between them. Stabilize oxygenation, ventilation and circulation, check glucose and give a benzodiazepine in parallel. If IV access is delayed, give a protocol-approved non-IV dose. Count prehospital doses, prepare a second-line load early and reassess for ongoing electrographic seizures when the motor activity stops but awareness fails to improve.

Which Clock Guides the Decision?

The International League Against Epilepsy (ILAE) uses two estimates. $t_1$ marks abnormally prolonged seizure activity and guides the start of treatment. $t_2$ marks a duration beyond which long-term consequences may occur. These times are estimates, and the evidence differs by seizure type. The 30-minute point for generalized convulsive status represents risk and never justifies delaying rescue. ILAE definition

Prolonged convulsions can impair ventilation, cause hyperthermia and raise lactate. Tachycardia or hypertension can occur, and hypotension or hypoventilation can appear at any point. Trend oxygenation, ventilation, perfusion, temperature and glucose and treat what is present. A high lactate after a convulsion can reflect muscle activity. Persistence after seizure control calls for reassessment of perfusion or another cause. In experimental status epilepticus, internalization of inhibitory GABA-A receptors offers one explanation for loss of benzodiazepine responsiveness. The animal findings do not predict when any one child will become refractory. Experimental receptor study · AES guideline

Stabilize and Give the First Dose

• Airway and breathing. Position the airway with cervical spine precautions when trauma is suspected. Clear accessible secretions safely and avoid forcing objects between clenched teeth. Give oxygen as needed and monitor oxygen saturation. Begin bag-mask ventilation promptly if respiratory effort is inadequate. Use cardiorespiratory monitoring and capnography when indicated and available. Prepare advanced airway support if ventilation or airway protection remains inadequate.
• Circulation and glucose. Assess pulses, blood pressure and perfusion. Obtain IV access or consider IO when urgent access is needed. Check glucose promptly and give dextrose for hypoglycemia with repeat glucose checks. For example, the Children's Colorado pathway uses IV 10% dextrose 5 mL/kg (max 150 mL) for glucose below 60 mg/dL. D10 contains 0.1 g/mL, so a 16-kg child receives 80 mL or 8 g. Use an age-appropriate protocol. Newborns have a separate evaluation and treatment pathway. Children's Colorado pathway
• Benzodiazepine. Give rescue treatment at five minutes of ongoing convulsions, or immediately on recognition if that duration has already been reached. As a protocol example, Johns Hopkins All Children's uses lorazepam 0.1 mg/kg IV (max 4 mg) or, without IV access, midazolam 0.2 mg/kg IM or 0.3 mg/kg intranasal (max 10 mg by either route). Doses differ by route and institution. Check for an individualized rescue plan and count doses given before arrival. If the seizure persists about five minutes after an adequate first dose, give the second per pathway while preparing the next-line agent. Avoid serial benzodiazepine doses that delay escalation, and support ventilation throughout. Johns Hopkins All Children's pathway

Escalate Promptly After Initial Rescue

Persistent convulsions despite adequate benzodiazepine treatment require an urgent IV antiseizure load. In the randomized ESETT pediatric analysis (eligibility age 2 to 17 years), about half of children reached the 60-minute endpoint with each agent. The endpoint was cessation of clinically apparent seizures and improved responsiveness without additional antiseizure medication. The trial did not establish superior efficacy for any of the three drugs. The chart shows the pediatric estimates and does not establish efficacy in children younger than two years, although five such children were enrolled as eligibility deviations. Choose according to the child's age, seizure syndrome, contraindications and pathway. ESETT age-group trial

For a 20-kg child, a 20 mg PE/kg fosphenytoin load is 400 mg PE. The labeled pediatric rate is at most 40 mg PE/min, so the infusion takes at least 10 minutes. Recheck blood pressure and rhythm after completion. U.S. fosphenytoin label · U.S. valproate injection label

In Dravet syndrome, chronic use of several sodium-channel blockers can aggravate seizures. For acute convulsive status after two appropriate benzodiazepine doses, international consensus favors IV valproate or levetiracetam, when eligible. IV phenytoin or fosphenytoin can be considered if seizures persist. Use the individualized emergency plan. Some local pathways exclude fosphenytoin from the initial second-line choice in Dravet. International Dravet consensus

If a benzodiazepine and an appropriate second-line load fail, treat as refractory status epilepticus. Activate PICU and neurology support, plan airway and hemodynamic management, and use continuous EEG (cEEG) to guide further treatment, including a continuous anesthetic when indicated. Paralysis can hide the motor signs of ongoing seizures. Consider cEEG if alertness shows no clear improvement within 10 minutes after motor activity ceases or consciousness remains impaired beyond 30 minutes. Use it sooner when ongoing seizures are strongly suspected. For critical-care EEG beyond the neonatal period, ACNS electrographic status criteria include an electrographic seizure lasting at least 10 continuous minutes or electrographic seizures totaling at least 20% of any 60-minute period (12 minutes). This definition serves a different purpose from the 5-minute bedside convulsive treatment threshold. ACNS cEEG indications · ACNS EEG terminology

Find and Treat the Cause in Parallel

• Fever and infection. Evaluate the source of fever and look for CNS infection. FEBSTAT used at least 30 minutes of febrile seizures for its research definition and reported definite or equivocal hippocampal T2 signal abnormality in 22 of 191 children who underwent initial MRI, 11.5%. That observation does not dictate when to give rescue therapy or require emergent MRI for every febrile seizure. When meningitis or encephalitis is suspected, collect cultures when feasible and give empiric therapy promptly. Defer lumbar puncture when unstable, actively seizing or showing signs of raised intracranial pressure. Choose imaging and CSF studies for the presentation. FEBSTAT · Pediatric meningitis guidance
• Metabolic and toxic causes. Check glucose immediately and select electrolytes, ionized calcium, magnesium, gas and ammonia according to the clinical picture. Severe symptomatic hypotonic hyponatremia with seizures needs prompt protocol-directed 3% saline alongside seizure and airway care, with close sodium monitoring. Consider hypocalcemia, hypomagnesemia, hyperammonemia and an inborn metabolic disorder when appropriate. Consider pyridoxine-dependent epilepsy in an infant with otherwise unexplained refractory seizures and coordinate monitored testing and therapy with specialists. Pyridoxine-dependent epilepsy consensus Ask about missed drugs, withdrawals and access to toxins. Obtain a targeted ECG and drug testing for plausible exposures. Pediatric hyponatremia guidance · Johns Hopkins All Children's pathway
• Structural, vascular and hypoxic causes. New focal deficits, head trauma or persistent unexplained encephalopathy warrant urgent evaluation for hemorrhage, stroke, infection or another structural cause. Consider abusive head trauma when indicated. Severe hypertension or calcineurin inhibitor exposure can suggest posterior reversible encephalopathy syndrome. Assess for hypoxic-ischemic injury after cardiac arrest or nonfatal drowning. Consider mimics such as dystonia, syncope and functional seizures when the history or exam suggests one. Individual motor signs or lactate do not establish the diagnosis. AAP drowning terminology · Pediatric convulsive status guideline
• Complications of prolonged convulsions. If there are signs of rhabdomyolysis, check creatine kinase, renal function, potassium and urine output. Give isotonic fluids according to perfusion, urine output and fluid tolerance. Treat dangerous hyperkalemia promptly. IV calcium stabilizes the myocardium when hyperkalemia causes ECG toxicity. It does not lower potassium. Rhabdomyolysis consensus · Pediatric hyperkalemia pathway