8.3 Non-Convulsive Status Epilepticus, Continuous Video EEG Monitoring & Post-Arrest Neuroprotection
Key Takeaways
If consciousness fails to improve after convulsions, assess for ongoing electrographic seizures and other causes. Subtle movements and paralysis change the need for EEG.
Electrographic seizure and electrographic status have different duration criteria. Six two-minute seizures in one hour meet the 20% hourly status threshold.
Begin cEEG as soon as feasible when indicated. At least 24 hours is usual for most indications, with longer or shorter monitoring guided by risk and the EEG.
Use cEEG to confirm electrographic control and detect recurrence during and after anesthetic weaning. The team selects the treatment endpoint.
After pediatric arrest, prevent fever in children who remain comatose. The 2025 AHA/AAP guideline supports either five-day temperature strategy and systolic and mean pressures above the 10th percentile for age.
Nonconvulsive Status, Continuous EEG and Post-Arrest Neuroprotection
Quick Answer: Consider ongoing electrographic seizures when consciousness fails to improve after convulsions or paralysis obscures motor signs. Start urgent EEG when seizures are suspected and use continuous EEG (cEEG) to detect recurrence and guide refractory treatment. After pediatric cardiac arrest, manage temperature, oxygenation, ventilation and blood pressure according to the child's physiology and the post-arrest guideline.
Recognize Ongoing Seizures
Nonconvulsive status can occur without overt shaking. Rhythmic eyelid flutter, sustained eye deviation, focal twitching and unexplained autonomic changes can prompt EEG evaluation, but none alone confirms a seizure. Sedatives, metabolic disturbances and structural injury can also explain impaired awareness. Neuromuscular blockade can hide a seizure's motor signs.
In a selected multicenter cohort monitored after convulsive status, 32/98 (32.7%) had subsequent electrographic seizures and 15 of those 32 met the study's status definition. In a separate cohort of 719 acutely encephalopathic PICU patients selected for cEEG, 184 (25.6%) had electrographic seizures, including 44 (6.1% of 719) meeting that study's older status definition. These cohorts illustrate the diagnostic yield in monitored populations. Their status frequencies depend on the definitions used and cannot be extrapolated to all PICU admissions. Postconvulsive cohort · Encephalopathy cohort
Distinguish an EEG Seizure from Status
The 2021 ACNS critical-care terminology defines an electrographic seizure as epileptiform discharges averaging more than 2.5 Hz for at least 10 seconds, or a definitely evolving pattern lasting at least 10 seconds. Electrographic status requires an electrographic seizure lasting at least 10 continuous minutes or cumulative electrographic seizures occupying at least 20% of any 60-minute interval. For example, six definite two-minute seizures in one hour total 12 minutes and meet the hourly threshold. This terminology is for critical-care EEG outside neonatal-specific criteria. The five-minute clinical threshold for treating ongoing bilateral convulsions is a separate decision.
An electroclinical seizure can be established by a definite time-locked clinical correlate or by both clinical and EEG improvement after a parenteral antiseizure medication. EEG improvement alone in an otherwise equivocal pattern warrants expert review. Review the raw tracing and bedside events together, including drug effects and artifacts. ACNS terminology
When to Start and How Long to Monitor
- After clinical seizures: Consider cEEG if alertness shows no clear improvement within 10 minutes, or consciousness remains impaired for more than 30 minutes after visible seizure activity stops. Start as soon as feasible when ongoing seizure is suspected. A comatose child with rhythmic eyelid flutter after convulsive status needs urgent cEEG while other causes are assessed.
- Acute brain injury or limited examination: Consider cEEG for acute supratentorial injury with altered awareness, unexplained fluctuating consciousness, or paralysis in a child at risk for seizures. After cardiac arrest, the 2025 AHA/AAP guideline recommends cEEG for persistent encephalopathy when resources are available. Treat clinical seizures. Treatment of nonconvulsive status after arrest is reasonable.
- Duration: ACNS recommends at least 24 hours for most indications, with shorter or longer recordings based on the clinical situation and early EEG. Coma, periodic discharges and pharmacologic sedation can warrant 48 hours or longer. In a pediatric observational study, age, prior seizures and early EEG risk changed the estimated time to a low remaining seizure risk. These factors guide reassessment rather than imposing a fixed duration for each diagnosis.
- Bedside trends: Video and quantitative displays such as spectrograms help flag events for review. Verify suspicious findings on raw EEG with the neurophysiology team. Movement, equipment and treatment artifacts can distort trends.
ACNS indications and duration · Pediatric duration cohort · AHA/AAP pediatric post-arrest guidance
Guide Anesthetic Treatment With EEG
Use cEEG to verify electrographic control during continuous anesthetic treatment and detect recurrence during taper. Depending on the clinical response and toxicity, the team may target electrographic seizure cessation or burst suppression. ACNS describes burst suppression as bursts alternating with periods under 10 microvolts that occupy 50% to 99% of the tracing. This describes a tracing and does not specify the target for an individual patient.
Neurocritical Care Society guidance suggests 24–48 hours of electrographic control before a gradual anesthetic withdrawal. ACNS advises monitoring throughout the infusion and often at least 24 hours after it is withdrawn, with longer observation when recurrence risk or pharmacokinetics warrant. In a paralyzed child, absence of convulsions cannot confirm seizure control. Neurocritical Care Society guideline · ACNS cEEG guidance
After Pediatric Cardiac Arrest
The two randomized THAPCA trials studied children who remained comatose after resuscitation. The lower-temperature arm used 32–34 °C for 48 hours, followed by rewarming and temperature control at 36–37.5 °C for the rest of the five-day course. The comparison arm used 36–37.5 °C throughout the five days. The primary outcome was 12-month survival with a Vineland-II score of at least 70, analyzed among eligible children with adequate prearrest function.
| Trial | Lower-temperature strategy | Normothermia throughout | Interpretation |
|---|---|---|---|
| Out-of-hospital arrest | 27/138 (20%) | 15/122 (12%) | P = 0.14 |
| In-hospital arrest | 48/133 (36%) | 48/124 (39%) | P = 0.63 |
The trials did not detect a statistically significant difference in the primary outcome. Their estimates do not establish equivalence. Use the chart to compare outcomes within each trial, because the in-hospital and out-of-hospital cohorts differed. THAPCA-OH · THAPCA-IH
Apply the 2025 AHA/AAP Pediatric Targets
| Parameter | Bedside application after return of circulation |
|---|---|
| Temperature | In children who remain comatose, continuously measure central temperature and prevent values above 37.5 °C. For ages 24 hours to 18 years after either arrest setting, a five-day course using either temperature strategy above is reasonable. |
| Blood pressure | Maintain systolic and mean arterial pressure above the 10th percentile for age. Use continuous arterial pressure monitoring when resources permit and tailor fluids and vasoactive support to perfusion, ventricular function and clinical response. |
| Oxygenation | Once reliable measurements are available, titrate oxygen toward normoxemia. An SpO₂ target of 94%–99% is reasonable for many patients. Use an appropriate baseline goal when underlying physiology differs. |
| Ventilation | Measure arterial CO₂ and limit substantial hypo- and hypercapnia. 35–45 mmHg is a typical normocapnic range, with individualization for chronic hypercapnia or other relevant physiology. |
| Glucose and electrolytes | Monitor glucose and electrolytes and correct hypoglycemia and clinically important derangements. Use the appropriate PICU protocol. A universal sodium target or routine hyperosmolar therapy does not follow from THAPCA. |
If severe traumatic brain injury coexists, intracranial hypertension and cerebral perfusion have their own treatment thresholds. When ICP is monitored, CPP = MAP − ICP. For example, MAP 62 mmHg and ICP 18 mmHg give a CPP of 44 mmHg, which can be interpreted against an age-appropriate severe-TBI target with the neurocritical care team. The Brain Trauma Foundation suggests a CPP target of 40–50 mmHg in severe pediatric TBI, with age-specific positioning within the range. This is distinct from routine post-arrest blood pressure management. Avoid using any isolated EEG, examination or imaging finding for early definitive neurologic prognostication. AHA/AAP pediatric guidance · Pediatric post-arrest checklist · Brain Trauma Foundation
A 5-year-old remains deeply comatose 20 minutes after convulsive status treated with lorazepam and levetiracetam. The APRN sees rhythmic eyelid fluttering. Which test best evaluates ongoing seizures?
Noncontrast head CT
Lumbar puncture with opening pressure
Urgent continuous video EEG
Transcranial Doppler ultrasonography
An intubated 8-year-old is receiving pentobarbital for refractory status epilepticus. Which approach best guides titration and withdrawal?
Target an isoelectric tracing for 12 hours, then stop the infusion abruptly.
Titrate to absence of visible movements, then stop after six hours.
Titrate to background slowing with sleep spindles, then stop after 72 hours.
Titrate to the agreed EEG endpoint. Confirm seizure control before a gradual taper under continuous EEG.
A comatose 7-year-old is mechanically ventilated after resuscitation from an out-of-hospital cardiac arrest. Which plan is consistent with the 2025 AHA/AAP pediatric post-arrest guideline?
Monitor central temperature continuously and prevent fever. Individualize oxygenation and ventilation and maintain systolic and mean arterial pressure above the 10th percentile for age.
Cool to 30–32 °C for 96 hours and target arterial CO₂ at 20–25 mmHg to reduce cerebral blood volume.
Allow temperature to reach 39.5 °C and target arterial oxygen above 300 mmHg to ensure oxygen delivery.
Cool to 28–30 °C and deliberately lower arterial pressure to reduce cerebral capillary pressure.
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