Clinical Approach to Seizures

Pediatric Neurology Framework

1
Symptom Overview
Overview
2
Pathophysiology
Mechanism
3
History Taking
History
4
Physical Examination
Examination
5
Differential Diagnosis
Differential
6
Investigations
Workup
7
Clinical Decision-Making
Algorithm
8
Pearls and Pitfalls
Summary

1. Symptom Overview

Understanding the clinical significance and classification of seizures in children

Seizures are one of the most common neurological emergencies in pediatrics, affecting approximately 4-10% of children during the first 16 years of life. Approximately 150,000 children in the United States experience a first unprovoked seizure annually. Febrile seizures alone occur in 2-5% of children between 6 months and 5 years of age. Epilepsy, defined as recurrent unprovoked seizures, affects approximately 0.5-1% of children, making it one of the most common chronic neurological conditions in childhood. Seizures account for approximately 1-2% of all pediatric emergency department visits and represent a significant source of anxiety for families and healthcare providers alike.

Definition

A seizure is a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain. This results from an imbalance between excitatory and inhibitory neurotransmission, leading to hypersynchronous electrical discharges that manifest as alterations in motor function, sensation, behavior, or consciousness. Seizures may be provoked (acute symptomatic) or unprovoked, and understanding this distinction is fundamental to management and prognosis.

Key Epidemiology in Children

Incidence: 25-70 per 100,000 children per year for unprovoked seizures
Febrile seizures: Most common seizure type in children; peak incidence at 18 months
Neonatal seizures: Occur in 1-3.5 per 1,000 live births; higher in preterm infants
Status epilepticus: 18-23 per 100,000 children per year; higher mortality in younger children
Recurrence risk: 30-50% after first unprovoked seizure; higher with abnormal electroencephalogram or neuroimaging

Classification by Duration and Context

Category	Definition	Common Causes	Clinical Significance
Brief Seizure	Less than 5 minutes	Febrile seizures, idiopathic epilepsy, benign epilepsy syndromes	Most seizures self-terminate; observe and assess for underlying cause
Prolonged Seizure	5-30 minutes	Febrile status, symptomatic epilepsy, acute brain injury	Requires active intervention; risk of neuronal injury increases with duration
Status Epilepticus	Greater than 5 minutes of continuous seizure activity OR two or more seizures without return to baseline	Acute symptomatic causes, medication non-compliance, febrile status, CNS infection	Medical emergency; immediate treatment required; associated with significant morbidity and mortality
Refractory Status Epilepticus	Seizure continuing despite two appropriate antiseizure medications	Severe acute brain injury, autoimmune encephalitis, genetic epilepsy syndromes	Requires intensive care; consider anesthetic agents; high mortality risk

Classification by Etiology

Category	Definition	Examples in Children	Prognosis
Acute Symptomatic (Provoked)	Seizure occurring in close temporal relationship with an acute central nervous system insult	Febrile seizures, meningitis, encephalitis, head trauma, hypoglycemia, electrolyte disturbances, toxic ingestion	Generally good if underlying cause is treated; lower recurrence risk than unprovoked seizures
Unprovoked	Seizure occurring without an identified acute precipitant	Idiopathic epilepsy, remote symptomatic (prior brain injury), genetic epilepsy syndromes	30-50% recurrence risk after first seizure; diagnosis of epilepsy after two unprovoked seizures
Remote Symptomatic	Unprovoked seizure in a child with prior central nervous system injury	Prior hypoxic-ischemic encephalopathy, prior meningitis, cortical malformation, perinatal stroke	Higher recurrence risk; often requires long-term antiseizure medication

Classification by Seizure Type (ILAE 2017)

Focal Onset Seizures

Originate within networks limited to one hemisphere. May be discretely localized or more widely distributed.

Focal Aware: Consciousness preserved; previously called simple partial
Focal Impaired Awareness: Consciousness impaired; previously called complex partial
Focal to Bilateral Tonic-Clonic: Begins focal, then spreads to involve both hemispheres

Motor features: Automatisms, atonic, clonic, epileptic spasms, hyperkinetic, myoclonic, tonic

Non-motor features: Autonomic, behavior arrest, cognitive, emotional, sensory

Generalized Onset Seizures

Originating at some point within, and rapidly engaging, bilaterally distributed networks.

Generalized Tonic-Clonic: Stiffening followed by rhythmic jerking; loss of consciousness
Absence: Brief staring spells with arrest of activity; 3 Hz spike-wave on EEG
Myoclonic: Brief, shock-like jerks of a muscle or group of muscles
Atonic: Sudden loss of muscle tone; “drop attacks”
Tonic: Sustained increase in muscle contraction
Clonic: Rhythmic jerking movements

Age-Specific Seizure Presentations

Age Group	Common Seizure Types	Common Epilepsy Syndromes	Special Considerations
Neonates (0-28 days)	Subtle (ocular, oral, cycling movements), clonic, tonic, myoclonic	Benign familial neonatal epilepsy, early myoclonic encephalopathy, Ohtahara syndrome	Seizures often subtle and easily missed; high risk of underlying structural or metabolic cause; EEG essential
Infants (1-12 months)	Infantile spasms, focal seizures, febrile seizures (after 6 months)	West syndrome (infantile spasms), Dravet syndrome, benign infantile epilepsy	Infantile spasms are a neurological emergency; early treatment improves outcomes
Toddlers (1-3 years)	Febrile seizures (peak), generalized tonic-clonic, myoclonic, focal	Febrile seizures, Dravet syndrome, myoclonic-astatic epilepsy (Doose syndrome)	Febrile seizures most common; distinguish simple from complex; consider Dravet if recurrent with fever
Preschool (3-5 years)	Absence seizures begin, febrile seizures decline, focal seizures	Childhood absence epilepsy, Lennox-Gastaut syndrome, benign epilepsy with centrotemporal spikes	Absence seizures may be mistaken for inattention; request 3-second hyperventilation during exam
School-age (6-12 years)	Absence, focal with centrotemporal spikes, generalized tonic-clonic	Childhood absence epilepsy, benign epilepsy with centrotemporal spikes (Rolandic), Panayiotopoulos syndrome	Rolandic epilepsy has excellent prognosis; absence epilepsy may affect academic performance
Adolescents (12-18 years)	Generalized tonic-clonic, myoclonic, absence	Juvenile myoclonic epilepsy, juvenile absence epilepsy, focal epilepsies	Juvenile myoclonic epilepsy often triggered by sleep deprivation; lifelong treatment usually required

Febrile Seizures: A Special Category

Simple Febrile Seizure

Age 6 months to 5 years
Generalized tonic-clonic
Duration less than 15 minutes
Does not recur within 24 hours
No prior neurological abnormality

Recurrence risk: 30-35% overall; higher if first seizure before 12 months or low-grade fever

Epilepsy risk: 1-2% (slightly higher than general population)

Complex Febrile Seizure

Focal features present
Duration greater than 15 minutes
Recurs within 24 hours
Post-ictal focal deficit (Todd’s paralysis)

Recurrence risk: Higher than simple febrile seizures

Epilepsy risk: 4-15% depending on number of complex features

Key Concept: The First Seizure Framework

When evaluating a child with a first seizure, the clinician must answer four critical questions:

Was this truly a seizure? Many paroxysmal events mimic seizures (syncope, breath-holding spells, movement disorders)
What type of seizure? Focal versus generalized determines workup and management
Was it provoked or unprovoked? Determines prognosis and need for treatment
Is there an underlying epilepsy syndrome? Many pediatric epilepsy syndromes have characteristic features, EEG patterns, and prognoses

Impact on Quality of Life

Seizures in children have far-reaching effects beyond the ictal event itself. Children with epilepsy have higher rates of learning disabilities, attention deficit hyperactivity disorder, anxiety, and depression compared to their peers. Parental anxiety often leads to overprotection, which can limit the child’s independence and social development. Academic performance may suffer due to the seizures themselves, medication side effects, and comorbid cognitive difficulties. Sleep disturbance is common and may exacerbate seizure frequency. The unpredictable nature of seizures creates significant psychosocial burden for the entire family. Early recognition, appropriate treatment, and attention to comorbidities are essential to optimizing outcomes in children with seizures.

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of seizures in children

Seizures result from an imbalance between excitatory and inhibitory neurotransmission in the brain, leading to hypersynchronous neuronal firing. The developing brain is particularly susceptible to seizures due to the relative predominance of excitatory neurotransmission, immature inhibitory systems, and ongoing synaptic plasticity. Understanding these mechanisms is essential for selecting appropriate antiseizure medications and predicting response to treatment.

The Excitation-Inhibition Balance

Component	Normal Function	Role in Seizure Generation
Glutamate (Excitatory)	Primary excitatory neurotransmitter; essential for learning, memory, and synaptic plasticity	Excess glutamate release or receptor activation leads to neuronal hyperexcitability and seizure initiation
GABA (Inhibitory)	Primary inhibitory neurotransmitter; gamma-aminobutyric acid suppresses neuronal firing	Reduced GABAergic inhibition fails to contain excitatory activity; many antiseizure medications enhance GABA
Voltage-Gated Sodium Channels	Generate action potentials; essential for neuronal signaling	Increased channel activity or mutations cause repetitive firing; sodium channel blockers are effective antiseizure medications
Voltage-Gated Calcium Channels	Regulate neurotransmitter release and neuronal excitability	T-type calcium channels involved in absence seizures; ethosuximide blocks these channels
Potassium Channels	Repolarize neurons and limit repetitive firing	Reduced potassium channel function leads to prolonged depolarization and increased seizure susceptibility

Developmental Susceptibility to Seizures

Why Are Children More Prone to Seizures?

The immature brain has several features that increase seizure susceptibility:

GABA is excitatory in early development: Due to high intracellular chloride concentrations in immature neurons, GABA receptor activation causes depolarization rather than hyperpolarization in neonates
Excess excitatory synapses: Synaptic density peaks in early childhood before pruning occurs
Immature potassium channels: Reduced ability to repolarize and limit neuronal firing
Incomplete myelination: Altered action potential propagation
Higher metabolic rate: Greater vulnerability to metabolic disturbances

Mechanisms of Seizure Initiation and Propagation

Phase	Cellular Events	Clinical Correlation
Initiation	Paroxysmal depolarizing shift in a group of neurons; burst of action potentials followed by hyperpolarization	Focal seizure onset; may be clinically silent if confined to small cortical area
Synchronization	Recruitment of surrounding neurons through synaptic connections and gap junctions	Seizure becomes clinically apparent; spread within a brain region
Propagation	Spread through white matter tracts, corpus callosum, or subcortical pathways	Focal to bilateral tonic-clonic progression; generalized seizure activity
Termination	Activation of inhibitory mechanisms, neuronal exhaustion, adenosine release, acidosis	Seizure stops spontaneously; post-ictal state reflects neuronal recovery

Mechanisms by Seizure Type

Generalized Tonic-Clonic

Mechanism: Bilateral cortical hyperexcitability with thalamocortical involvement

Tonic phase: Sustained cortical and subcortical activation causing muscle rigidity

Clonic phase: Alternating excitation and inhibition producing rhythmic jerking

Treatment target: Sodium channels, GABA enhancement

Absence Seizures

Mechanism: Abnormal thalamocortical oscillations involving T-type calcium channels

Circuit: Reciprocal connections between thalamus and cortex generate 3 Hz spike-wave

GABA-B involvement: Enhanced GABA-B receptor activity paradoxically promotes absence seizures

Treatment target: T-type calcium channels (ethosuximide)

Focal Seizures

Mechanism: Localized cortical hyperexcitability, often due to structural lesion or focal cortical dysplasia

Semiology: Clinical manifestations reflect function of involved cortex (motor, sensory, autonomic)

Propagation: May spread locally or generalize via corpus callosum

Treatment target: Sodium channels, surgical resection if drug-resistant

How Specific Conditions Cause Seizures

Condition	Mechanism	Treatment Implication
Febrile Seizures	Fever increases brain temperature, enhancing neuronal excitability; immature thermoregulation; possible viral or cytokine-mediated effects; genetic susceptibility in ion channels	Antipyretics do not prevent febrile seizures; intermittent benzodiazepines may reduce recurrence in high-risk children
Hypoglycemia	Neurons depend on glucose as primary energy source; ATP depletion impairs sodium-potassium ATPase, leading to depolarization and seizures	Immediate glucose administration; identify and treat underlying cause; prolonged hypoglycemia causes permanent injury
Hyponatremia	Cellular swelling due to osmotic water movement into neurons; altered neuronal excitability	Careful sodium correction to avoid osmotic demyelination; seizure risk highest when sodium falls rapidly below 120 mEq/L
Hypocalcemia	Calcium stabilizes neuronal membranes; low calcium increases neuronal excitability and neuromuscular irritability	Intravenous calcium gluconate for acute symptomatic hypocalcemia; address underlying cause
Meningitis/Encephalitis	Direct neuronal injury, inflammatory cytokines, cerebral edema, metabolic derangement, vascular compromise	Treat underlying infection; seizures may indicate complicated course; prophylactic antiseizure medication controversial
Hypoxic-Ischemic Encephalopathy	ATP depletion leads to failure of sodium-potassium ATPase; excitotoxic glutamate release; calcium influx triggers neuronal death	Therapeutic hypothermia neuroprotective; phenobarbital commonly used; seizures indicate moderate-severe injury
Focal Cortical Dysplasia	Abnormal cortical architecture with dysplastic neurons that have altered ion channel expression; intrinsically epileptogenic	Often drug-resistant; surgical resection may be curative if lesion can be completely excised
Dravet Syndrome	SCN1A gene mutation affects sodium channels in inhibitory interneurons; loss of inhibition leads to hyperexcitability	Avoid sodium channel blockers (may worsen seizures); valproate, clobazam, stiripentol, fenfluramine, cannabidiol are effective
Infantile Spasms (West Syndrome)	Abnormal cortical-subcortical interactions; hypothalamic-pituitary-adrenal axis involvement; multiple underlying etiologies	Adrenocorticotropic hormone or vigabatrin are first-line; early treatment improves developmental outcomes
Pyridoxine-Dependent Epilepsy	ALDH7A1 gene mutation causes accumulation of toxic metabolites that inhibit glutamate decarboxylase, reducing GABA synthesis	Lifelong pyridoxine (vitamin B6) supplementation; consider pyridoxine trial in neonatal seizures refractory to standard treatment

Often Overlooked Mechanism: GABA-B in Absence Epilepsy

While most antiseizure medications work by enhancing GABAergic inhibition, this approach can paradoxically worsen absence seizures. GABA-B receptor activation in thalamocortical circuits promotes the oscillatory activity underlying absence seizures. This explains why medications like vigabatrin and tiagabine (which increase GABA levels) can exacerbate absence seizures, and why ethosuximide (which blocks T-type calcium channels without affecting GABA) is the first-line treatment for pure absence epilepsy.

Consequences of Prolonged Seizure Activity

Time	Pathophysiological Changes	Clinical Implications
0-5 minutes	Increased cerebral blood flow and metabolism compensate for increased demand	Seizure may self-terminate; monitor and prepare for intervention
5-30 minutes	Failure of compensatory mechanisms; GABA receptor internalization; emergence of pharmacoresistance	Urgent treatment required; benzodiazepines become less effective with time
Greater than 30 minutes	Excitotoxic neuronal injury; systemic complications (hyperthermia, rhabdomyolysis, acidosis); cerebral edema	Risk of permanent neurological injury; aggressive treatment with multiple agents; intensive care required

Genetic Mechanisms in Pediatric Epilepsy

Advances in genetic testing have revealed that many pediatric epilepsies have an underlying genetic cause. Understanding these mechanisms guides treatment selection and provides prognostic information.

Gene	Channel/Protein Affected	Associated Syndrome	Treatment Implication
SCN1A	Sodium channel Nav1.1	Dravet syndrome, genetic epilepsy with febrile seizures plus	Avoid sodium channel blockers; use valproate, clobazam, stiripentol
SCN2A	Sodium channel Nav1.2	Early infantile epileptic encephalopathy, benign familial neonatal-infantile seizures	Gain-of-function: sodium channel blockers may help; Loss-of-function: avoid sodium channel blockers
KCNQ2	Potassium channel Kv7.2	Benign familial neonatal epilepsy, KCNQ2 encephalopathy	Sodium channel blockers often effective; retigabine (potassium channel opener) may help
SLC2A1	Glucose transporter GLUT1	GLUT1 deficiency syndrome	Ketogenic diet is treatment of choice; provides alternative brain fuel
TSC1/TSC2	Hamartin/Tuberin (mTOR pathway)	Tuberous sclerosis complex	mTOR inhibitors (everolimus) can reduce seizures; vigabatrin first-line for infantile spasms

Clinical Pearl: Precision Medicine in Pediatric Epilepsy

The era of precision medicine in epilepsy means that genetic diagnosis can directly inform treatment. For example:

A child with SCN1A-related Dravet syndrome should never receive carbamazepine or lamotrigine (sodium channel blockers), as these can trigger status epilepticus
A child with GLUT1 deficiency will not respond to conventional antiseizure medications but will dramatically improve with the ketogenic diet
A child with pyridoxine-dependent epilepsy requires lifelong vitamin B6 supplementation

Consider genetic testing in any child with early-onset epilepsy, developmental delay with seizures, or drug-resistant epilepsy.

3. History Taking

A comprehensive approach to eliciting the seizure history in children

Red Flags — Require Urgent Evaluation

Prolonged seizure (greater than 5 minutes) — Status epilepticus; immediate treatment required
Seizure with fever and altered mental status — Meningitis or encephalitis until proven otherwise
Focal neurological deficit post-seizure — Structural lesion, stroke, or Todd’s paralysis
Seizure following head trauma — Intracranial hemorrhage or contusion
First seizure in neonate — High likelihood of serious underlying cause
Seizure with signs of increased intracranial pressure — Papilledema, bulging fontanelle, Cushing triad

Multiple seizures without return to baseline — Status epilepticus by definition
Seizure with hypoglycemia — Immediate glucose required; neuronal injury ongoing
New seizure in immunocompromised child — Opportunistic central nervous system infection
Seizure with petechial rash — Meningococcemia; requires immediate antibiotics
Infantile spasms pattern — Neurological emergency; early treatment critical for outcome
Seizure with suspected ingestion or poisoning — Toxicology workup; specific antidotes may exist

Systematic History: The “SEIZURE” Approach

Use the mnemonic “SEIZURE” to ensure comprehensive history taking in pediatric seizures:

S — Start and Setting: What was the child doing when it started? Was there a warning (aura)? Where did the movements begin?
E — Evolution and Events: How did the episode evolve? What movements occurred? Was consciousness preserved or impaired?
I — Ictal details: Duration? Eye deviation? Cyanosis? Incontinence? Tongue biting? Automatisms?
Z — Zero-in on triggers: Fever? Sleep deprivation? Flashing lights? Missed medications? Illness? Stress?
U — Underlying conditions: Past medical history, birth history, development, prior seizures, family history of epilepsy
R — Recovery (Post-ictal): How long to return to baseline? Sleepiness? Confusion? Weakness (Todd’s paralysis)? Headache?
E — Effect on life: Impact on school, sleep, activities, family anxiety, any injuries during seizures?

Detailed Event Description

The most valuable information comes from witnesses who observed the event. If possible, ask witnesses to demonstrate what they saw, or review any video recordings captured on mobile phones. Video evidence can be invaluable for classification.

Phase	Key Questions	Clinical Significance
Pre-ictal	“Was your child completely well before this happened? Any warning signs? Did they complain of anything unusual (funny feeling, smell, taste, fear)?”	Aura suggests focal onset; specific aura types localize seizure origin (epigastric rising = temporal lobe)
Ictal Onset	“What happened first? Where did the movements start? Did the eyes deviate? Which direction?”	Focal onset with secondary generalization suggests structural cause; eye deviation away from seizure focus
Ictal Evolution	“What did the movements look like? Stiffening? Jerking? Both? Did it spread from one area to another?”	Tonic-clonic pattern suggests generalized or focal to bilateral; Jacksonian march indicates focal motor cortex origin
Consciousness	“Could your child hear you? Respond to commands? Do they remember the episode?”	Preserved awareness suggests focal aware seizure; impaired awareness suggests focal impaired awareness or generalized
Associated Features	“Did they turn blue? Foam at the mouth? Bite their tongue? Lose bladder control? Make any sounds?”	Cyanosis indicates impaired respiration; tongue biting (lateral) specific for seizure; incontinence nonspecific but common in generalized seizures
Duration	“How long did the shaking last? Did anyone time it?”	Caregiver estimates often overestimate duration; greater than 5 minutes defines status epilepticus
Post-ictal	“How long until they were completely back to normal? Were they confused? Sleepy? Any weakness on one side?”	Prolonged post-ictal state suggests generalized seizure; Todd’s paralysis indicates focal motor seizure

Targeted Questions by Suspected Cause

Suspected Cause	Key Features	Ask This Question
Febrile Seizure	Age 6 months to 5 years, fever, generalized, brief	“Did your child have a fever? How high? How quickly did the temperature rise? Any source of infection?”
Meningitis/Encephalitis	Fever, headache, neck stiffness, altered mental status, photophobia	“Has your child been more irritable or lethargic? Complaining of headache or neck pain? Sensitive to light? Any rash?”
Hypoglycemia	Pallor, sweating, tremor, altered consciousness, diabetic child	“Does your child have diabetes? When did they last eat? Any sweating or shakiness before the event?”
Electrolyte Disturbance	Vomiting, diarrhea, poor intake, chronic illness	“Has your child had vomiting or diarrhea? How much fluid intake? Any chronic medical conditions?”
Toxic Ingestion	Access to medications, sudden onset, altered mental status	“Could your child have gotten into any medications or household products? What medications are in the home?”
Infantile Spasms	Clusters of brief flexor/extensor spasms, developmental regression, age 3-12 months	“Are the episodes occurring in clusters? Does your child seem to be losing skills they had before?”
Absence Epilepsy	Brief staring spells, immediate return to baseline, multiple daily episodes	“Does your child have staring spells where they seem to ‘blank out’? How often? Can you interrupt them?”
Juvenile Myoclonic Epilepsy	Morning myoclonic jerks, generalized tonic-clonic, adolescent onset	“Does your teenager have jerking movements in the morning? Do they drop things at breakfast? Any sleep deprivation?”
Temporal Lobe Epilepsy	Aura (déjà vu, fear, epigastric sensation), automatisms, impaired awareness	“Does your child describe any unusual feelings before the seizure? Fear? Strange taste or smell? Lip smacking or hand movements during?”
Frontal Lobe Epilepsy	Brief, nocturnal, hyperkinetic movements, minimal post-ictal state	“Do the seizures happen mainly at night? Are there unusual thrashing or bicycling movements? Does your child recover quickly?”

Birth and Developmental History

Essential in All Pediatric Seizure Evaluations

The birth and developmental history provides critical clues to underlying etiology and helps identify children at higher risk for epilepsy.

Birth History

Gestational age: Preterm infants at higher risk for seizures and epilepsy
Birth weight: Small for gestational age may indicate intrauterine growth restriction
Delivery complications: Prolonged labor, fetal distress, cord problems
Apgar scores: Low scores suggest perinatal asphyxia
NICU admission: Duration, reason, interventions required
Neonatal seizures: Prior neonatal seizures increase epilepsy risk
Intubation/ventilation: May indicate severe perinatal illness
Neonatal infections: Meningitis, sepsis increase seizure risk
Hyperbilirubinemia: Severe jaundice can cause kernicterus

Developmental History

Motor milestones: Head control, sitting, walking — delays suggest underlying brain abnormality
Language milestones: Babbling, first words, sentences
Social milestones: Smiling, eye contact, interactive play
Developmental regression: Loss of skills is a red flag for progressive condition or epileptic encephalopathy
Current school performance: Learning difficulties may indicate underlying cognitive impairment
Behavioral concerns: Autism spectrum, attention deficit hyperactivity disorder common comorbidities

Family History

Family History Finding	Clinical Significance	Specific Syndromes to Consider
Febrile seizures in first-degree relatives	Increases risk of febrile seizures to 10-20%	Simple febrile seizures, genetic epilepsy with febrile seizures plus
Epilepsy in first-degree relatives	Suggests genetic susceptibility; 2-4 times increased risk	Childhood absence epilepsy, juvenile myoclonic epilepsy, benign epilepsy with centrotemporal spikes
Neonatal seizures in siblings	Consider benign familial neonatal epilepsy	KCNQ2-related epilepsy, benign familial neonatal-infantile epilepsy
Sudden unexplained death in family	Consider SUDEP risk, channelopathies affecting heart and brain	Dravet syndrome, long QT syndrome with seizures
Neurocutaneous findings in family	Autosomal dominant conditions may present variably	Tuberous sclerosis complex, neurofibromatosis
Consanguinity	Increases risk for autosomal recessive metabolic and genetic epilepsies	Pyridoxine-dependent epilepsy, neuronal ceroid lipofuscinosis, many others

Medication and Social History

Medications That Can Cause Seizures

Antihistamines (diphenhydramine overdose) — Anticholinergic toxicity
Stimulants (methylphenidate, amphetamines) — Lower seizure threshold
Tramadol — Lowers seizure threshold significantly
Bupropion — Dose-dependent seizure risk
Isoniazid — Pyridoxine depletion; treat with vitamin B6
Theophylline — Narrow therapeutic window
Cyclosporine/Tacrolimus — Posterior reversible encephalopathy syndrome
Metoclopramide — Can cause dystonic reactions mimicking seizures

Antiseizure Medication History

Current medications and doses
Recent dose changes
Compliance — missed doses?
Recent illness affecting absorption
Drug interactions

Social History

Childcare/School: Exposure to illnesses; teachers may witness events
Sleep habits: Sleep deprivation is a major trigger
Screen time: Photosensitive epilepsy (video games, flashing lights)
Recreational activities: Head injury risk assessment
Adolescent concerns: Alcohol, recreational drugs, compliance with medication
Household safety: Access to medications, chemicals
Family stress: May affect compliance and seizure frequency

Immunization Status

Up to date with vaccinations?
Any seizures following immunization? (usually benign febrile seizures)
Pertussis vaccination status (consider pertussis encephalopathy differential)

Seizure Mimics: Differentiating True Seizures

Key History Features That Suggest Non-Epileptic Events

Breath-holding spells: Triggered by crying, pain, or frustration; brief apnea followed by color change (pallid or cyanotic), then stiffening or jerking; rapid recovery; age 6 months to 6 years

Syncope: Preceded by lightheadedness, tunnel vision, diaphoresis; occurs in upright position; brief jerking may occur (convulsive syncope); rapid recovery

Night terrors/Parasomnias: Occur during sleep, child appears terrified but is not responsive, no memory of event, occur in first third of night

Psychogenic non-epileptic seizures: Variable semiology, eyes often closed, pelvic thrusting, side-to-side head movements, waxing and waning, prolonged duration, preserved awareness despite apparent unresponsiveness

Movement disorders: Stereotyped movements, suppressible, occur during wakefulness, no impaired consciousness (tics, stereotypies, dystonia)

4. Physical Examination

A systematic head-to-toe approach for pediatric seizures

Systematic Framework: Use the “Head to Extremities” approach for complete examination of children presenting with seizures. The examination has two key goals: (1) identify signs of acute illness requiring urgent intervention, and (2) detect findings suggesting an underlying etiology for the seizure.

General Inspection

Level of consciousness: Alert, drowsy, lethargic, obtunded, comatose — document Glasgow Coma Scale or pediatric equivalent
Respiratory pattern: Tachypnea, irregular breathing, apnea — may indicate ongoing seizure activity or central nervous system pathology
Color: Cyanosis (ongoing seizure, respiratory compromise), pallor (anemia, shock), jaundice (metabolic disease)
Posturing: Decorticate or decerebrate posturing indicates severe brain injury
Activity: Spontaneous movements, response to stimulation, any ongoing seizure activity
Dysmorphic features: May suggest genetic syndrome associated with epilepsy
Nutritional status: Failure to thrive may indicate chronic illness or metabolic disorder

Vital Signs

Age-Appropriate Normal Values

Vital signs must be interpreted according to age-specific normal ranges. Post-ictal children commonly have tachycardia and mild hypertension that should normalize during the recovery period.

Age	Heart Rate (beats per minute)	Respiratory Rate (breaths per minute)	Systolic Blood Pressure (mmHg)
Neonate (0-28 days)	100-160	30-60	60-90
Infant (1-12 months)	100-150	25-40	80-100
Toddler (1-3 years)	90-140	20-30	90-105
Preschool (3-5 years)	80-120	20-25	95-110
School-age (6-12 years)	70-110	18-25	100-120
Adolescent (12-18 years)	60-100	12-20	110-130

Vital Sign	Abnormal Finding	Clinical Significance
Temperature	Fever (greater than 38°C)	Febrile seizure; central nervous system infection; systemic infection as trigger
Temperature	Hypothermia	Sepsis in young infants; toxic ingestion; prolonged environmental exposure
Heart Rate	Tachycardia	Post-ictal state; fever; hypovolemia; medication effect; ongoing seizure activity
Heart Rate	Bradycardia	Increased intracranial pressure (Cushing reflex); toxic ingestion; cardiac arrhythmia
Blood Pressure	Hypertension	Post-ictal; increased intracranial pressure; posterior reversible encephalopathy syndrome; pheochromocytoma
Blood Pressure	Hypotension	Sepsis; toxic ingestion; status epilepticus with systemic compromise
Respiratory Rate	Tachypnea	Metabolic acidosis (diabetic ketoacidosis); respiratory infection; post-ictal
Oxygen Saturation	Less than 94%	Ongoing seizure; post-ictal hypoventilation; aspiration; respiratory infection
Glucose	Less than 60 mg/dL (3.3 mmol/L)	Hypoglycemia as cause; immediate treatment required

Growth Parameters

Plot weight, height/length, and head circumference on appropriate growth charts. Abnormal growth patterns may indicate underlying syndromic or metabolic conditions.

Finding	Consider
Microcephaly	Congenital infection (TORCH), genetic syndrome, brain malformation, in utero insult
Macrocephaly	Hydrocephalus, megalencephaly, subdural collections, storage disorders
Failure to thrive	Chronic illness, metabolic disorder, malabsorption, neglect
Short stature	Genetic syndrome, chronic medication effects, endocrine disorders

Head and Fontanelle Examination

Fontanelle (Infants)

Bulging fontanelle: Increased intracranial pressure — meningitis, hydrocephalus, intracranial hemorrhage
Sunken fontanelle: Dehydration
Premature closure: Craniosynostosis — may restrict brain growth
Large fontanelle: Hydrocephalus, hypothyroidism, rickets, chromosomal abnormalities

Scalp and Skull

Trauma signs: Bruising, swelling, lacerations — consider non-accidental injury in young children
Cephalohematoma: May indicate birth trauma or coagulopathy
Cranial bruits: Arteriovenous malformation
Abnormal head shape: Plagiocephaly, craniosynostosis

Neurological Examination

The neurological examination is the cornerstone of seizure evaluation. Document findings carefully, as focal abnormalities direct workup toward structural or localized pathology.

Mental Status and Level of Consciousness

Assessment	How to Test (Age-Appropriate)	Abnormal Findings and Significance
Alertness	Observe spontaneous activity; response to voice, touch, pain	Post-ictal drowsiness expected; prolonged altered consciousness suggests status, central nervous system infection, or structural lesion
Orientation	Ask name, age, location, date (school-age children and older)	Confusion indicates post-ictal state or encephalopathy
Interaction	Eye contact, social smile (infants); following commands; appropriate conversation	Poor interaction may indicate ongoing subclinical seizures or encephalopathy
Language	Spontaneous speech, naming, repetition, comprehension	Aphasia suggests dominant hemisphere involvement

Cranial Nerves

Cranial Nerve	Test	Abnormal Finding	Clinical Significance
II (Optic)	Pupillary response, visual fields, fundoscopy	Papilledema, visual field defect	Increased intracranial pressure; occipital lesion
III, IV, VI (Oculomotor, Trochlear, Abducens)	Eye movements, pupil size and reactivity	Gaze palsy, pupil asymmetry, ptosis	Brainstem lesion; herniation; III nerve palsy with aneurysm
VII (Facial)	Facial symmetry at rest and with movement	Facial weakness	Upper motor neuron (forehead sparing) vs lower motor neuron pattern; Todd’s paralysis
IX, X (Glossopharyngeal, Vagus)	Gag reflex, swallowing, voice quality	Absent gag, dysphagia, dysarthria	Brainstem dysfunction; aspiration risk
XII (Hypoglossal)	Tongue protrusion and movement	Tongue deviation, fasciculations	Tongue bite injury; lower motor neuron lesion

Motor Examination

Component	What to Assess	Significance of Abnormalities
Tone	Passive movement of limbs; head lag in infants; truncal tone	Hypotonia — metabolic, genetic, neuromuscular; Hypertonia — cerebral palsy, post-ictal; Asymmetry — focal lesion
Power	Spontaneous movement; resistance to gravity; formal strength testing in older children	Focal weakness suggests structural lesion or Todd’s paralysis; global weakness in metabolic or neuromuscular disease
Reflexes	Deep tendon reflexes; plantar response; primitive reflexes in infants	Asymmetry suggests focal pathology; hyperreflexia in upper motor neuron lesion; absent reflexes in lower motor neuron or shock
Coordination	Finger-nose-finger; heel-shin; gait observation; Romberg test	Ataxia suggests cerebellar or posterior fossa pathology; medication toxicity (phenytoin)

Todd’s Paralysis

Focal weakness following a seizure (Todd’s paralysis) typically resolves within 24-48 hours. It indicates a focal seizure origin from the contralateral motor cortex. However, new focal deficits that persist or worsen require urgent neuroimaging to exclude stroke, tumor, or other structural lesion.

Skin Examination — Neurocutaneous Findings

The skin examination is essential in all children with seizures, as neurocutaneous syndromes frequently present with epilepsy. Use a Wood’s lamp to detect hypopigmented lesions in fair-skinned children.

Finding	Description	Associated Condition
Ash-leaf spots	Hypopigmented macules, often lance-ovate shaped; may need Wood’s lamp	Tuberous sclerosis complex
Shagreen patch	Raised, flesh-colored plaque with orange-peel texture; typically lower back	Tuberous sclerosis complex
Facial angiofibromas	Red papules on face, especially nasolabial folds; appear in childhood	Tuberous sclerosis complex
Café-au-lait spots	Light brown macules; 6 or more larger than 5mm (prepubertal) is significant	Neurofibromatosis type 1
Axillary freckling	Freckling in axillary or inguinal regions	Neurofibromatosis type 1
Port-wine stain (facial)	Flat, pink-to-purple vascular malformation in trigeminal nerve distribution	Sturge-Weber syndrome
Linear sebaceous nevus	Yellow-orange waxy plaque, often on face or scalp	Linear sebaceous nevus syndrome (Schimmelpenning syndrome)
Incontinentia pigmenti	Evolving skin lesions: vesicles → verrucous → hyperpigmented whorls	Incontinentia pigmenti (X-linked dominant)
Petechiae/Purpura	Non-blanching lesions	Meningococcemia; thrombocytopenia; non-accidental injury

Signs of Meningeal Irritation

Classic Signs

Neck stiffness: Resistance to passive neck flexion
Kernig sign: Pain with knee extension when hip is flexed
Brudzinski sign: Involuntary hip flexion when neck is flexed
Photophobia: Aversion to bright light

Important Caveats

Infants: Classic signs often absent; look for irritability, bulging fontanelle, poor feeding
Post-ictal: Neck stiffness may occur transiently post-ictally
Sensitivity: Absence of meningeal signs does not exclude meningitis, especially in young children

Cardiovascular Examination

Finding	Assessment	Significance for Seizure Evaluation
Heart murmur	Auscultate all areas; assess radiation	Congenital heart disease — risk of embolic stroke; bacterial endocarditis with embolic phenomena
Arrhythmia	Irregular rhythm; bradycardia; tachycardia	Long QT syndrome can present with seizure-like episodes (actually cardiac syncope)
Peripheral pulses	Femoral pulses; capillary refill	Coarctation of aorta (weak femorals) — associated with intracranial aneurysms

Fundoscopic Examination

Critical Findings on Fundoscopy

Papilledema: Indicates increased intracranial pressure — requires urgent neuroimaging before lumbar puncture
Retinal hemorrhages: In an infant with seizures, consider abusive head trauma (shaken baby syndrome)
Chorioretinitis: Suggests congenital infection (toxoplasmosis, cytomegalovirus)
Retinal phakomas: Tuberous sclerosis complex
Cherry-red spot: Storage disorders (Tay-Sachs disease, GM1 gangliosidosis)

Expected Findings by Etiology

Etiology	General Appearance	Neurological Findings	Other Key Findings
Simple febrile seizure	Febrile, post-ictal drowsiness resolving	Normal neurological exam once recovered	Source of fever (otitis media, viral illness); normal development
Meningitis	Ill-appearing, febrile, irritable or lethargic	Meningeal signs; altered consciousness	Bulging fontanelle (infants); petechial rash (meningococcus)
Hypoglycemia	Pallor, diaphoresis, tremulous	Altered consciousness; may be normal post-treatment	Hepatomegaly (glycogen storage disease); insulin injection sites
Toxic ingestion	Variable; may have altered vital signs	Altered consciousness; miosis or mydriasis	Toxidrome signs (anticholinergic, cholinergic, sympathomimetic)
Tuberous sclerosis complex	Variable; may appear well	May be normal or have developmental delay	Ash-leaf spots, shagreen patch, facial angiofibromas
Intracranial hemorrhage	Variable; may have signs of trauma	Focal deficits; altered consciousness; signs of increased intracranial pressure	Scalp swelling; retinal hemorrhages in abusive head trauma
Idiopathic generalized epilepsy	Well-appearing between seizures	Normal examination	Normal development; positive family history
Infantile spasms (West syndrome)	May appear subdued; developmental plateau or regression	Hypotonia; developmental delay	May have findings of underlying cause (tuberous sclerosis, Down syndrome)

Important Teaching Point

Normal examination is common! Many children with seizures, including those with epilepsy, have entirely normal physical examinations. A normal examination does not exclude significant underlying pathology. The history remains the most valuable component of seizure evaluation. However, any abnormality on examination should prompt thorough investigation, as it may provide crucial localizing or diagnostic information.

Developmental Assessment

A brief developmental assessment should be performed in all children with seizures. Developmental delay or regression is an important finding that influences the differential diagnosis and workup.

Domain	Age-Appropriate Milestones to Assess	Significance of Delay
Gross Motor	Head control (3-4 months), sitting (6 months), walking (12-15 months)	Delay suggests underlying brain abnormality; consider cerebral palsy, genetic syndrome
Fine Motor	Reaching (4 months), pincer grasp (9 months), drawing (2-3 years)	Asymmetric use suggests hemiparesis
Language	Babbling (6 months), first words (12 months), two-word phrases (24 months)	Language delay common in epileptic encephalopathies; consider Landau-Kleffner syndrome if regression
Social	Social smile (2 months), stranger anxiety (9 months), pretend play (18-24 months)	Autism spectrum disorder commonly comorbid with epilepsy

5. Differential Diagnosis

Systematic approach organized by probability, age, and clinical features

The differential diagnosis of seizures in children must consider both true seizures (epileptic events) and seizure mimics (non-epileptic paroxysmal events). Among true seizures, the clinician must determine whether the seizure is provoked (acute symptomatic) or unprovoked, as this distinction has major implications for prognosis and management.

First Seizure: Provoked vs Unprovoked

Step-by-Step Approach to a First Seizure:

Step 1: Confirm this was truly a seizure — rule out seizure mimics
Step 2: Is there an acute provoking factor? — fever, infection, metabolic disturbance, trauma, toxin
Step 3: Classify the seizure type — focal vs generalized; motor vs non-motor
Step 4: Is there an underlying epilepsy syndrome? — age of onset, seizure semiology, EEG pattern
Step 5: Are there risk factors for recurrence? — abnormal EEG, abnormal neuroimaging, developmental delay, nocturnal seizure

Acute Symptomatic (Provoked) Seizures

Probability	Etiology	Key Features	Red Flags
COMMON	Febrile seizure	Age 6 months to 5 years; fever greater than 38°C; generalized tonic-clonic; duration usually less than 5 minutes	Complex features (focal, prolonged, recurrent); age less than 6 months or greater than 5 years
COMMON	Viral illness with fever	Upper respiratory symptoms; gastroenteritis; roseola (human herpesvirus 6 notorious for febrile seizures)	Altered mental status out of proportion to fever; focal neurological signs
LESS COMMON	Hypoglycemia	Pallor, sweating, tremor, altered consciousness; diabetic child or prolonged fasting	Recurrent hypoglycemia; hepatomegaly; failure to thrive
LESS COMMON	Electrolyte disturbance	Hyponatremia (water intoxication, SIADH); hypocalcemia (rickets, hypoparathyroidism); hypomagnesemia	Severe derangement; failure to correct with standard treatment
LESS COMMON	Traumatic brain injury	History of head trauma; may have external signs of injury; immediate or early post-traumatic seizure	Prolonged loss of consciousness; focal deficit; signs of skull fracture
LESS COMMON	Toxic ingestion	Access to medications or toxins; altered mental status; toxidrome	Severe toxicity; unknown substance; cardiovascular instability
UNCOMMON BUT SERIOUS	Bacterial meningitis	Fever, irritability, bulging fontanelle (infants), neck stiffness (older children), petechial rash	Rapid deterioration; shock; purpuric rash; focal neurological signs
UNCOMMON BUT SERIOUS	Viral encephalitis	Fever, altered mental status, behavioral change, focal seizures; herpes simplex encephalitis most serious	Temporal lobe features; rapid progression; focal deficits
UNCOMMON BUT SERIOUS	Intracranial hemorrhage	Trauma history (or absent in non-accidental injury); headache; vomiting; altered consciousness	Signs of increased intracranial pressure; retinal hemorrhages in infant
UNCOMMON BUT SERIOUS	Hypertensive encephalopathy / Posterior reversible encephalopathy syndrome	Severely elevated blood pressure; headache; visual disturbance; altered mental status	End-organ damage; underlying renal disease

Unprovoked Seizures and Epilepsy Syndromes by Age

Neonatal Period (0-28 days)

Probability	Condition	Key Features	Prognosis
COMMON	Hypoxic-ischemic encephalopathy	Perinatal asphyxia; abnormal tone; depressed consciousness; seizures typically within first 24-72 hours	Variable; depends on severity; therapeutic hypothermia improves outcomes
COMMON	Intracranial hemorrhage	Preterm infants (intraventricular hemorrhage); term infants (subdural, subarachnoid); may have trauma history	Depends on extent; intraventricular hemorrhage grades III-IV have worse outcomes
LESS COMMON	Neonatal infections (meningitis, sepsis, TORCH)	Lethargy, poor feeding, temperature instability; group B streptococcus, Escherichia coli, Listeria common	Variable; early treatment critical
LESS COMMON	Benign familial neonatal epilepsy	Family history; onset day 2-7; brief clonic seizures; normal interictal examination	Excellent; seizures resolve by 6 months; normal development
LESS COMMON	Metabolic disorders	Poor feeding, lethargy, abnormal movements; pyridoxine-dependent epilepsy, non-ketotic hyperglycinemia, urea cycle defects	Variable; some treatable if diagnosed early (pyridoxine-dependent epilepsy)
UNCOMMON BUT SERIOUS	Brain malformations	Lissencephaly, holoprosencephaly, polymicrogyria; often have dysmorphic features; severe developmental delay	Generally poor; often drug-resistant epilepsy
UNCOMMON BUT SERIOUS	Early infantile epileptic encephalopathy (Ohtahara syndrome)	Onset first 3 months; tonic spasms; burst-suppression on EEG; often structural cause	Poor; high mortality; survivors have severe disability

Infancy (1-12 months)

Probability	Condition	Key Features	Prognosis
COMMON	Febrile seizures (after 6 months)	Associated with fever; generalized; brief; normal development	Excellent; 1-2% epilepsy risk for simple febrile seizures
LESS COMMON	Infantile spasms (West syndrome)	Clusters of flexor or extensor spasms; onset 3-12 months; hypsarrhythmia on EEG; developmental regression	Guarded; early treatment critical; many have underlying cause
LESS COMMON	Dravet syndrome	Prolonged febrile seizures in first year; later afebrile seizures; developmental plateau then regression; SCN1A mutation	Poor; drug-resistant epilepsy; cognitive impairment; SUDEP risk
LESS COMMON	Benign infantile epilepsy	Focal seizures in clusters; onset 3-8 months; normal development; may have family history	Excellent; seizures resolve; normal development
UNCOMMON	Tuberous sclerosis complex	Infantile spasms; hypopigmented macules; cardiac rhabdomyomas; cortical tubers on MRI	Variable; vigabatrin first-line for infantile spasms in tuberous sclerosis

Early Childhood (1-5 years)

Probability	Condition	Key Features	Prognosis
COMMON	Febrile seizures	Peak incidence 18 months; prevalence 2-5%; usually generalized tonic-clonic	Excellent; most outgrow by age 5-6 years
COMMON	Genetic epilepsy with febrile seizures plus	Febrile seizures persisting beyond age 6; afebrile seizures develop; family history; SCN1A, SCN1B mutations	Variable; ranges from benign to severe
LESS COMMON	Myoclonic-astatic epilepsy (Doose syndrome)	Onset 2-5 years; myoclonic and atonic seizures; falls; may have generalized tonic-clonic; normal prior development	Variable; 50-80% achieve seizure control; some cognitive difficulties
LESS COMMON	Lennox-Gastaut syndrome	Multiple seizure types (tonic, atonic, atypical absence); slow spike-wave on EEG; cognitive impairment	Poor; drug-resistant; progressive cognitive decline
LESS COMMON	Panayiotopoulos syndrome	Onset 3-6 years; autonomic symptoms (vomiting, pallor); prolonged seizures; often nocturnal; occipital spikes	Excellent; self-limited; resolves by adolescence

School Age (6-12 years)

Probability	Condition	Key Features	Prognosis
COMMON	Childhood absence epilepsy	Onset 4-10 years; brief staring spells (5-20 seconds); multiple daily; 3 Hz spike-wave; triggered by hyperventilation	Good; 70% remit by adolescence; 15% develop generalized tonic-clonic seizures
COMMON	Benign epilepsy with centrotemporal spikes (Rolandic epilepsy)	Onset 3-13 years; focal motor seizures involving face and arm; often nocturnal; centrotemporal spikes on EEG	Excellent; remits by age 16; normal development
LESS COMMON	Childhood occipital epilepsy (Gastaut type)	Onset 8-9 years; visual symptoms (elementary hallucinations, blindness); headache; occipital spikes	Variable; may persist into adulthood
LESS COMMON	Focal epilepsy (structural)	Focal seizures with semiology reflecting lesion location; focal cortical dysplasia, tumor, vascular malformation	Variable; surgery may be curative for focal lesions
UNCOMMON	Landau-Kleffner syndrome (epileptic aphasia)	Acquired aphasia; auditory agnosia; seizures in 70%; electrical status epilepticus in sleep	Variable; language may improve; cognitive outcomes variable

Adolescence (12-18 years)

Probability	Condition	Key Features	Prognosis
COMMON	Juvenile myoclonic epilepsy	Onset 12-18 years; morning myoclonic jerks; generalized tonic-clonic seizures; sleep deprivation trigger; photosensitivity	Good seizure control with medication; lifelong treatment usually required
COMMON	Juvenile absence epilepsy	Onset 10-17 years; less frequent absence than childhood form; generalized tonic-clonic common	Variable; less likely to remit than childhood absence epilepsy
LESS COMMON	Epilepsy with generalized tonic-clonic seizures alone	Generalized tonic-clonic without absence or myoclonus; often on awakening; EEG generalized spike-wave	Good; most respond to appropriate medication
LESS COMMON	Temporal lobe epilepsy	Aura (epigastric, fear, déjà vu); impaired awareness; automatisms; may have history of febrile seizures	Variable; mesial temporal sclerosis may require surgery
UNCOMMON	Progressive myoclonic epilepsies	Myoclonus, tonic-clonic seizures, progressive ataxia, cognitive decline; Lafora disease, Unverricht-Lundborg, neuronal ceroid lipofuscinosis	Poor; progressive neurodegenerative course

Anatomical Approach to Focal Seizures

Frontal Lobe

Features: Brief, frequent, often nocturnal; hyperkinetic movements; minimal post-ictal state

Motor signs: Tonic posturing, clonic jerking, asymmetric tonic seizures

Causes: Focal cortical dysplasia, tumors, post-traumatic

Temporal Lobe

Features: Aura common (epigastric rising, fear, déjà vu); impaired awareness; automatisms (lip smacking, hand movements)

Post-ictal: Confusion, aphasia if dominant hemisphere

Causes: Mesial temporal sclerosis, tumors, focal cortical dysplasia

Parietal Lobe

Features: Sensory symptoms (tingling, numbness); may spread to motor cortex

Other: Spatial disorientation, body image distortion

Causes: Tumors, vascular malformations, focal cortical dysplasia

Occipital Lobe

Features: Visual symptoms (flashing lights, colors, blindness); may spread anteriorly

Post-ictal: Headache common

Causes: Occipital epilepsy syndromes, structural lesions

Non-Epileptic Paroxysmal Events (Seizure Mimics)

Condition	Age Group	Key Features	Distinguishing Points
Breath-holding spells	6 months to 6 years	Triggered by crying, pain, frustration; pallid or cyanotic; brief stiffening/jerking may occur	Clear precipitant; color change precedes any motor activity; rapid recovery
Reflex anoxic seizures	Infancy to early childhood	Vagal-mediated asystole; triggered by minor pain, startle; pallor, loss of consciousness, tonic posturing	Triggered by minor stimulus; pallor at onset; very brief; may have family history
Syncope	Any age, common in adolescents	Prodrome (lightheadedness, tunnel vision); occurs upright; brief jerking may occur (convulsive syncope)	Postural; prodrome present; rapid recovery; no post-ictal confusion
Night terrors	2-6 years	First third of night; screaming, inconsolable, no memory; autonomic arousal	Occurs during non-REM sleep; child not responsive during event; no stereotyped movements
Parasomnias (sleepwalking, confusional arousals)	Childhood	Occur from deep sleep; complex behaviors; no memory of event	First third of night; non-stereotyped; responsive to redirection (sometimes)
Benign sleep myoclonus of infancy	Neonates and young infants	Rhythmic jerking only during sleep; stops when infant woken	Only during sleep; stops with arousal; normal EEG
Jitteriness in neonates	Neonates	Stimulus-sensitive tremor; stops with gentle restraint; no eye deviation or autonomic changes	Stimulus-sensitive; suppressible; symmetric tremor rather than clonic jerking
Tics	School age and adolescents	Stereotyped movements; preceded by urge; temporarily suppressible	Awareness preserved; can be suppressed; no post-event confusion
Stereotypies	Early childhood	Repetitive movements (hand flapping, body rocking); often with excitement; stoppable with distraction	Interruptible; awareness preserved; associated with autism spectrum or normal development
Psychogenic non-epileptic seizures	Older children and adolescents	Variable semiology; prolonged; eyes often closed; pelvic thrusting; waxing and waning	Variable pattern; preserved awareness despite apparent unresponsiveness; psychological comorbidity
Sandifer syndrome	Infants	Dystonic posturing associated with gastroesophageal reflux; head turning, arching	Related to feeds; no altered consciousness; responds to reflux treatment
Migraine with aura	School age and adolescents	Visual disturbance, sensory symptoms; followed by headache	Symptoms evolve slowly (minutes); headache follows; positive family history
Cardiac arrhythmias (long QT syndrome)	Any age	Syncope with exercise, emotion, or startle; may have convulsive features; family history of sudden death	Triggered by exercise, emotion, swimming; prolonged QTc on ECG; family history

Drug-Induced Seizures

Drug or Toxin	Mechanism	Clinical Features	Management Considerations
Diphenhydramine (antihistamine overdose)	Anticholinergic effects; sodium channel blockade at high doses	Tachycardia, mydriasis, dry skin, urinary retention, agitation, seizures	Benzodiazepines for seizures; physostigmine controversial; supportive care
Tricyclic antidepressants	Sodium channel blockade; anticholinergic; norepinephrine reuptake inhibition	Altered mental status, seizures, wide QRS, arrhythmias, hypotension	Sodium bicarbonate for cardiac toxicity; benzodiazepines for seizures
Isoniazid	Depletes pyridoxine (vitamin B6); inhibits GABA synthesis	Refractory seizures, metabolic acidosis, coma	Pyridoxine is specific antidote (gram-for-gram dosing)
Tramadol	Lowers seizure threshold; serotonergic effects	Seizures, serotonin syndrome features	Benzodiazepines; avoid in patients with seizure history
Bupropion	Lowers seizure threshold (dose-dependent)	Seizures, tachycardia, agitation	Benzodiazepines; supportive care
Sympathomimetics (amphetamines, cocaine)	Excessive catecholamine release; hyperthermia	Agitation, hyperthermia, hypertension, seizures, arrhythmias	Benzodiazepines; cooling; avoid beta-blockers
Organophosphates	Acetylcholinesterase inhibition; cholinergic excess	SLUDGE syndrome (salivation, lacrimation, urination, defecation, GI upset, emesis); seizures	Atropine, pralidoxime, benzodiazepines
Theophylline	Adenosine receptor antagonism; phosphodiesterase inhibition	Vomiting, tachycardia, arrhythmias, seizures (often refractory)	Benzodiazepines; consider hemodialysis for severe toxicity
Camphor	CNS stimulant; found in some topical preparations	Rapid onset seizures, altered mental status	Benzodiazepines; supportive care
Alcohol withdrawal	GABA downregulation; glutamate upregulation during chronic use	Seizures typically 6-48 hours after last drink; risk of delirium tremens	Benzodiazepines; supportive care; consider in adolescents

Quick Reference: “If You See This, Think This”

Clinical Clue	Think This First	Next Step
Infant with clusters of brief flexor spasms and developmental regression	Infantile spasms (West syndrome)	Urgent EEG; brain MRI; early treatment critical
Prolonged febrile seizures in first year with subsequent afebrile seizures	Dravet syndrome	Genetic testing (SCN1A); avoid sodium channel blockers
School-age child with frequent staring spells triggered by hyperventilation	Childhood absence epilepsy	EEG; ethosuximide or valproate first-line
Nocturnal focal motor seizures with centrotemporal spikes, normal development	Benign epilepsy with centrotemporal spikes	Reassurance; treatment often not needed; excellent prognosis
Adolescent with morning myoclonic jerks and generalized tonic-clonic seizures	Juvenile myoclonic epilepsy	EEG; valproate (caution in females) or levetiracetam; avoid sleep deprivation
Fever, altered mental status, focal seizures, CSF pleocytosis	Herpes simplex encephalitis	Immediate acyclovir; MRI; PCR for herpes simplex virus
Neonate with refractory seizures, no clear cause, burst suppression	Pyridoxine-dependent epilepsy or other metabolic disorder	Pyridoxine trial; metabolic workup; genetic testing
Infant with ash-leaf spots and infantile spasms	Tuberous sclerosis complex	Vigabatrin first-line; echocardiogram; renal ultrasound; genetic testing
Syncope during exercise or with emotion; family history of sudden death	Long QT syndrome	ECG with QTc measurement; cardiology referral; genetic testing
Toddler with breath-holding, cyanosis, then stiffening and brief jerking	Cyanotic breath-holding spell	Reassurance; iron studies; usually self-limited

6. Diagnostic Investigations

A stepwise, evidence-based approach guided by clinical suspicion

The investigation of pediatric seizures should be guided by the clinical presentation, age of the child, and findings on history and examination. Not every child with a seizure requires extensive testing. The goals are to identify treatable causes, classify the seizure type and epilepsy syndrome, and guide management decisions.

Immediate Bedside Testing

Check Immediately in All Children with Active or Recent Seizure

Blood glucose: Point-of-care testing; treat hypoglycemia immediately
Oxygen saturation: Continuous monitoring during and after seizure
Temperature: Identify febrile seizures; rule out CNS infection

Heart rate and blood pressure: Identify hemodynamic instability
Level of consciousness: Track post-ictal recovery; identify ongoing subtle seizures
Pupil examination: Asymmetry suggests structural lesion or herniation

Laboratory Investigations

First Unprovoked Seizure — Routine Testing

Investigation	When to Order	What to Look For	Practical Points
Blood glucose	All children with seizure	Hypoglycemia (less than 60 mg/dL or 3.3 mmol/L)	Point-of-care testing; if low, obtain formal lab glucose and investigate cause
Serum sodium	History of vomiting, diarrhea, excessive water intake; infants	Hyponatremia (less than 135 mEq/L); significant if less than 125 mEq/L	Water intoxication; SIADH; dilute formula; psychogenic polydipsia in older children
Serum calcium, magnesium	Neonates; infants; signs of tetany; history of malabsorption	Hypocalcemia (ionized calcium less than 4.0 mg/dL); hypomagnesemia	Correct ionized calcium for albumin; magnesium required for calcium correction
Complete blood count	If infection suspected; baseline if starting antiseizure medication	Leukocytosis (infection); anemia; thrombocytopenia	Not routinely needed for simple febrile seizures in well-appearing child
Basic metabolic panel	Prolonged seizure; status epilepticus; ill-appearing child	Electrolyte abnormalities; renal function; acidosis	Lactate elevated post-ictally (normalizes within hours)

Evidence-Based Approach to Laboratory Testing

The American Academy of Pediatrics and American Academy of Neurology guidelines note that routine laboratory testing (electrolytes, glucose, calcium) has a low yield in well-appearing children with a first unprovoked seizure who have returned to baseline. Testing should be guided by clinical suspicion based on history and examination, not obtained reflexively.

Targeted Laboratory Investigations

Clinical Scenario	Investigations to Consider	Rationale
Suspected CNS infection	Lumbar puncture (CSF cell count, protein, glucose, culture, HSV PCR); blood culture; procalcitonin	Meningitis and encephalitis are medical emergencies; HSV encephalitis requires early acyclovir
Suspected toxic ingestion	Toxicology screen; acetaminophen and salicylate levels; specific drug levels based on exposure	Identify treatable cause; guide antidote therapy
Neonatal seizures	Glucose, calcium, magnesium, electrolytes; ammonia; lactate; amino acids; urine organic acids; sepsis workup	High likelihood of metabolic or infectious cause; treatable conditions must not be missed
Suspected inborn error of metabolism	Ammonia, lactate, pyruvate, amino acids, acylcarnitine profile, urine organic acids, biotinidase	Early diagnosis allows specific treatment; sample during acute illness if possible
Refractory neonatal seizures	CSF glycine, serine, neurotransmitters; pyridoxine trial; genetic epilepsy panel	Non-ketotic hyperglycinemia, serine deficiency, pyridoxine-dependent epilepsy
Epilepsy on treatment	Antiseizure medication levels; complete blood count; liver function; renal function (drug-specific)	Monitor compliance, toxicity, and drug-specific complications

Lumbar Puncture

Indications for Lumbar Puncture in Children with Seizures:

Clinical signs of meningitis or encephalitis (fever with altered mental status, meningeal signs, petechial rash)
Infants less than 6 months with febrile seizure (lower threshold due to unreliable clinical signs)
Infants 6-12 months with febrile seizure if immunization status is incomplete or unknown (especially Haemophilus influenzae type b and Streptococcus pneumoniae)
Child on antibiotics (may mask meningitis)
Prolonged post-ictal altered mental status without clear explanation
Suspected autoimmune encephalitis (anti-NMDA receptor encephalitis)

Contraindications: Signs of increased intracranial pressure; hemodynamic instability; coagulopathy; infection over puncture site. Obtain neuroimaging before lumbar puncture if increased intracranial pressure is suspected.

Electroencephalogram (EEG)

The EEG is the most important diagnostic test in epilepsy. It provides information about seizure type, epilepsy syndrome, and guides treatment decisions.

EEG Type	Indications	Advantages	Limitations
Routine EEG (20-40 minutes)	First unprovoked seizure; suspected epilepsy; classification of epilepsy syndrome	Widely available; non-invasive; no sedation usually required	May miss interictal discharges; timing after seizure affects yield
Sleep-deprived EEG	Routine EEG non-diagnostic; suspected generalized epilepsy; juvenile myoclonic epilepsy	Increases yield for interictal discharges; captures sleep activation	May be difficult in young children; requires preparation
Prolonged video-EEG monitoring	Unclear diagnosis (seizure vs non-epileptic event); surgical evaluation; characterize seizure semiology	Captures clinical events with EEG correlation; gold standard for diagnosis	Resource-intensive; requires admission; may not capture events
Continuous EEG monitoring	Status epilepticus; critically ill child; coma; suspected non-convulsive seizures	Detects subclinical seizures; monitors treatment response	Requires ICU setting; expertise for interpretation
Ambulatory EEG	Frequent events not captured on routine EEG; home monitoring	Records in natural environment; captures sleep and wake cycles	No video correlation; electrode displacement; artifact

EEG Findings by Epilepsy Syndrome

Childhood absence epilepsy: 3 Hz generalized spike-wave, activated by hyperventilation
Juvenile myoclonic epilepsy: 4-6 Hz generalized polyspike-wave
Benign epilepsy with centrotemporal spikes: Centrotemporal spikes, activated by sleep
Infantile spasms: Hypsarrhythmia (chaotic high-amplitude pattern)
Lennox-Gastaut syndrome: Slow spike-wave (less than 2.5 Hz)
Dravet syndrome: Initially normal; later generalized and multifocal discharges

Optimizing EEG Yield

Timing: EEG within 24 hours of seizure has highest yield
Sleep: Include sleep recording; many epilepsies show sleep activation
Hyperventilation: Provokes absence seizures; perform for 3 minutes
Photic stimulation: Identifies photosensitivity (juvenile myoclonic epilepsy)
Age-appropriate interpretation: Normal patterns vary with age and state
Serial EEGs: May be needed; single normal EEG does not exclude epilepsy

Clinical Pearl: EEG Interpretation

A normal EEG does not exclude epilepsy. Up to 50% of children with epilepsy may have a normal initial routine EEG. Conversely, epileptiform discharges can occur in children without epilepsy (approximately 3-5% of normal children). The EEG must always be interpreted in the clinical context. If the clinical history is highly suggestive of epilepsy, treatment may be initiated despite a normal EEG.

Neuroimaging

MRI Brain — The Preferred Imaging Modality

Indication	Urgency	Specific Protocol Considerations
First unprovoked seizure with focal features	Urgent (within days to weeks)	Epilepsy protocol with thin cuts through temporal lobes
Focal neurological deficit	Urgent (within 24 hours)	Consider MRA if stroke suspected
Infantile spasms	Urgent (within days)	High-resolution imaging; may identify tuberous sclerosis, cortical dysplasia
Drug-resistant epilepsy	Semi-urgent	3 Tesla MRI with epilepsy protocol; consider repeat imaging if prior was inadequate
Cognitive or developmental regression	Urgent	May identify progressive lesion or leukodystrophy
Abnormal neurological examination	Urgent	Tailored to clinical findings
First generalized seizure, normal development, normal examination	Non-urgent (elective)	May be deferred if EEG shows typical idiopathic generalized epilepsy pattern

CT Brain — When to Use

Indication for CT	Rationale	Limitations
Acute trauma with seizure	Rapid identification of intracranial hemorrhage, skull fracture	Poor resolution for subtle lesions; radiation exposure
Suspected intracranial hemorrhage	Rapidly available; sensitive for acute blood	MRI superior for subacute blood and underlying lesion
Signs of increased intracranial pressure (before lumbar puncture)	Rule out mass effect before LP	Does not definitively exclude elevated ICP
MRI not available or contraindicated	Better than no imaging in urgent situations	MRI should follow when available
Status epilepticus with unknown cause	Rapid assessment for treatable cause	MRI superior when patient stabilized

Pediatric Imaging Considerations

Radiation exposure: CT delivers significant radiation; use ALARA principles (As Low As Reasonably Achievable); prefer MRI when possible
Sedation: Young children often require sedation for MRI; weigh risks and benefits; some centers offer “feed and wrap” for infants
Contrast: Gadolinium contrast for MRI when tumor, infection, or inflammation suspected
Epilepsy protocol MRI: Includes thin coronal cuts through hippocampi, FLAIR sequences, 3D volumetric imaging

Genetic Testing

Genetic testing has revolutionized the diagnosis and management of pediatric epilepsy. Identifying a genetic cause can guide treatment selection, provide prognostic information, and inform family counseling.

Clinical Scenario	Recommended Testing	Key Genes/Findings
Infantile-onset epilepsy with developmental delay	Epilepsy gene panel or whole exome sequencing	SCN1A (Dravet), SCN2A, KCNQ2, CDKL5, STXBP1, many others
Infantile spasms	Chromosomal microarray; epilepsy gene panel; consider whole exome	TSC1/TSC2 (tuberous sclerosis), ARX, CDKL5, Down syndrome
Drug-resistant epilepsy	Epilepsy gene panel; pharmacogenomics	May identify precision therapy targets; HLA-B*15:02 (carbamazepine hypersensitivity in Asians)
Suspected Dravet syndrome	SCN1A sequencing and deletion/duplication analysis	SCN1A pathogenic variant in greater than 80% of Dravet syndrome
Suspected channelopathy (seizures plus cardiac arrhythmia)	Cardiac and epilepsy gene panel	SCN5A, KCNQ1, KCNH2 (cardiac); SCN1A, SCN2A (epilepsy)
Progressive neurological decline with epilepsy	Gene panel for neuronal ceroid lipofuscinoses, progressive myoclonic epilepsies; whole exome	CLN genes, EPM1, EPM2A/NHLRC1 (Lafora)
Suspected tuberous sclerosis complex	TSC1/TSC2 sequencing and deletion/duplication analysis	Clinical diagnosis possible; genetic confirmation aids family counseling

Additional Specialized Investigations

Cardiac Evaluation

ECG: All children with unexplained syncope; suspected long QT syndrome; before starting certain medications (sodium channel blockers)
QTc measurement: Prolonged if greater than 460 ms (prepubertal) or greater than 470 ms (adolescent males) / greater than 480 ms (adolescent females)
Echocardiogram: Suspected tuberous sclerosis (cardiac rhabdomyomas); structural heart disease
Holter monitor: Intermittent arrhythmia suspected

Metabolic Studies

CSF studies: Glucose (GLUT1 deficiency — CSF:serum glucose ratio less than 0.4), glycine, neurotransmitters, lactate
Urine organic acids: Organic acidurias
Plasma amino acids: Aminoacidopathies
Acylcarnitine profile: Fatty acid oxidation defects
Biotinidase activity: Biotinidase deficiency (treatable)
Very long chain fatty acids: Peroxisomal disorders

Investigation Algorithms by Presentation

Simple Febrile Seizure in Well-Appearing Child

Minimal Workup Required:

No routine laboratory tests, EEG, or neuroimaging required
Identify and treat source of fever
Lumbar puncture only if clinical signs of meningitis or child is incompletely immunized
Educate family about febrile seizure recurrence and prognosis

First Unprovoked Seizure — Standard Workup

Recommended Investigations:

EEG: Obtain within 24 hours if possible; sleep-deprived if routine non-diagnostic
MRI brain: Recommended for all; urgent if focal seizure, focal deficit, or abnormal development
Laboratory tests: Guided by clinical suspicion; not routine in well-appearing child
Consider genetic testing: If syndromic features, developmental delay, or family history

Status Epilepticus — Emergency Workup

Concurrent with Treatment:

Point-of-care glucose: Treat hypoglycemia immediately
Basic metabolic panel: Electrolytes, renal function, glucose
Complete blood count: Infection, anemia
Blood gas: Acidosis, lactate
Antiseizure medication levels: If on treatment
Toxicology screen: If ingestion suspected
CT head: If trauma or signs of increased ICP
Lumbar puncture: If infection suspected (after imaging if ICP concern)
Continuous EEG: When available; monitor for non-convulsive status

Neonatal Seizures — Comprehensive Workup

High Yield of Treatable Causes — Investigate Thoroughly:

Glucose, calcium, magnesium, electrolytes
Sepsis workup: Blood culture, urine culture, lumbar puncture (CSF studies, HSV PCR)
Ammonia, lactate, blood gas
Continuous EEG monitoring: Neonatal seizures often subtle; EEG essential
MRI brain: Urgent; evaluate for hypoxic-ischemic injury, hemorrhage, malformation
Metabolic workup: Amino acids, organic acids, acylcarnitine, biotinidase
Pyridoxine trial: If seizures refractory to standard treatment
Genetic testing: Epilepsy gene panel if cause not identified

7. Clinical Decision-Making

Practical algorithms and decision pathways for pediatric seizures

Step 1: Is This Urgent?

Clinical Scenario	Urgency Level	Immediate Action
Active seizure greater than 5 minutes	EMERGENT	Initiate status epilepticus protocol; benzodiazepine immediately; airway management; call for help
Seizure with respiratory compromise or cyanosis	EMERGENT	Position airway; suction if needed; supplemental oxygen; prepare for ventilation support
Seizure with signs of increased intracranial pressure	EMERGENT	Elevate head of bed; avoid hypotension; urgent CT; neurosurgical consultation
Seizure with fever and altered mental status (meningitis suspected)	EMERGENT	Blood cultures; empiric antibiotics immediately; lumbar puncture when safe; acyclovir if encephalitis suspected
Seizure with hypoglycemia	EMERGENT	IV dextrose immediately (2-4 mL/kg of D25W in children; 2 mL/kg of D10W in neonates)
Infantile spasms (new diagnosis)	URGENT	Urgent EEG; brain MRI; initiate treatment within days (ACTH or vigabatrin); pediatric neurology referral
First focal seizure with post-ictal deficit	URGENT	Urgent neuroimaging (CT if MRI not immediately available); neurology consultation
First unprovoked seizure, now at baseline	URGENT	EEG within 24 hours if possible; outpatient MRI; neurology referral within 1-2 weeks
Simple febrile seizure, well-appearing child	ROUTINE	Identify fever source; parental education; no routine investigations; follow-up with pediatrician
Known epilepsy with typical breakthrough seizure	ROUTINE	Assess compliance; check medication levels if applicable; adjust treatment if pattern changing; routine follow-up

Step 2: Was This Truly a Seizure?

Key Differentiating Features:

Seizure: Stereotyped; not interruptible; may have post-ictal state; eye deviation; rhythmic movements evolving over time
Syncope: Postural; prodrome of lightheadedness; brief duration; rapid recovery; brief jerking possible (convulsive syncope)
Breath-holding spell: Clear precipitant (crying, pain); color change precedes motor activity; rapid recovery
Psychogenic event: Variable semiology; eyes often closed; waxing/waning; preserved awareness despite apparent unresponsiveness

When uncertain: Video-EEG monitoring is the gold standard for distinguishing seizures from mimics.

Step 3: Classify the Seizure

Provoked (Acute Symptomatic)

Identifiable acute cause within 7 days

Febrile seizure
Metabolic disturbance
CNS infection
Acute head trauma
Toxic ingestion

Action: Treat underlying cause; antiseizure medication usually not needed long-term

Unprovoked — First Seizure

No identifiable acute provoking factor

Recurrence risk 30-50%
Higher if abnormal EEG
Higher if abnormal MRI
Higher if nocturnal seizure

Action: EEG and MRI; treatment decision individualized

Epilepsy

Two or more unprovoked seizures greater than 24 hours apart; OR one seizure with high recurrence risk

Identify epilepsy syndrome
Guide treatment selection
Provide prognosis

Action: Initiate antiseizure medication; long-term management plan

Step 4: Should I Start Antiseizure Medication?

Clinical Situation	Recommendation	Rationale
Simple febrile seizure	NO — Do not treat	Excellent prognosis; no evidence that treatment prevents epilepsy; medication side effects outweigh benefits
First unprovoked seizure, normal EEG and MRI	CONSIDER — Shared decision-making	30-40% recurrence risk; treatment reduces recurrence but does not change long-term prognosis; discuss risks/benefits with family
First unprovoked seizure with abnormal EEG or MRI	CONSIDER — Lower threshold to treat	Higher recurrence risk (60-70%); treatment may be reasonable; individualize based on seizure impact and family preference
Two or more unprovoked seizures (epilepsy)	YES — Generally treat	High recurrence risk; treatment improves seizure control and quality of life
Benign epilepsy with centrotemporal spikes (infrequent seizures)	CONSIDER — Treatment optional	Excellent prognosis; seizures often nocturnal and infrequent; may observe without treatment
Infantile spasms	YES — Treat urgently	Developmental emergency; early treatment improves outcomes; ACTH or vigabatrin first-line
Childhood absence epilepsy	YES — Treat	Frequent seizures impact learning and safety; excellent response to medication

Antiseizure Medication Selection by Seizure Type

Seizure/Syndrome Type	First-Line Options	Alternatives	Avoid
Focal seizures	Levetiracetam, oxcarbazepine, carbamazepine	Lamotrigine, lacosamide, topiramate	Ethosuximide (not effective)
Generalized tonic-clonic	Valproate, levetiracetam, lamotrigine	Topiramate, zonisamide	Carbamazepine, oxcarbazepine (may worsen)
Absence seizures	Ethosuximide (pure absence), valproate	Lamotrigine	Carbamazepine, oxcarbazepine, phenytoin, vigabatrin (worsen absence)
Juvenile myoclonic epilepsy	Valproate (caution in females), levetiracetam	Lamotrigine (may worsen myoclonus in some), topiramate	Carbamazepine, phenytoin (worsen myoclonus)
Infantile spasms	ACTH (adrenocorticotropic hormone), vigabatrin (especially if tuberous sclerosis)	Oral corticosteroids, topiramate	Standard antiseizure medications generally ineffective
Dravet syndrome	Valproate, clobazam, stiripentol	Cannabidiol, fenfluramine, topiramate	Sodium channel blockers (carbamazepine, oxcarbazepine, lamotrigine, phenytoin) — may trigger status epilepticus
Lennox-Gastaut syndrome	Valproate, lamotrigine, rufinamide	Clobazam, topiramate, cannabidiol, felbamate	Often drug-resistant; multiple medications needed
Benign epilepsy with centrotemporal spikes	Levetiracetam, carbamazepine, oxcarbazepine	Valproate, sulthiame (Europe)	Often no treatment needed; excellent prognosis

Critical: Medications to Avoid in Specific Syndromes

Dravet syndrome: NEVER use sodium channel blockers (carbamazepine, oxcarbazepine, lamotrigine, phenytoin) — can trigger prolonged seizures and status epilepticus
Absence epilepsy: Avoid carbamazepine, oxcarbazepine, phenytoin, gabapentin, vigabatrin, tiagabine — may worsen absence seizures
Juvenile myoclonic epilepsy: Avoid carbamazepine, phenytoin, gabapentin — may worsen myoclonus
Myoclonic-astatic epilepsy: Avoid carbamazepine — may worsen seizures

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
Child seizing in front of me	Time the seizure; protect from injury; position on side; do NOT restrain or put anything in mouth	If greater than 5 minutes, give benzodiazepine; call for help; prepare airway equipment
Seizure stopped but child not waking up	Ensure airway patent; monitor vital signs; check glucose	If prolonged, consider non-convulsive status; obtain EEG; evaluate for underlying cause
Parent describes episode but child now normal	Detailed history of event; complete examination including neurological	Determine if seizure vs mimic; arrange appropriate investigations; safety counseling
Febrile seizure — complex features (prolonged, focal, recurrent)	Ensure seizure stopped; evaluate for meningitis; check glucose	Consider lumbar puncture; EEG; MRI if focal; neurology referral; counsel about Dravet syndrome risk if very prolonged
Known epilepsy patient with increased seizure frequency	Assess compliance; check for triggers (illness, sleep deprivation); verify medication supply	Check drug levels; consider dose adjustment; evaluate for new diagnosis; neurology follow-up
Teenager with first seizure after night of poor sleep	Full evaluation for first seizure; ask about morning myoclonic jerks	High suspicion for juvenile myoclonic epilepsy; EEG with sleep deprivation; counsel about lifestyle triggers
Infant with clusters of brief jerking movements	Detailed description; video if possible; developmental assessment	High suspicion for infantile spasms; urgent EEG; MRI; immediate neurology referral — this is a developmental emergency
Child with epilepsy starting new medication and develops rash	Assess rash severity; check for mucosal involvement; assess for systemic symptoms	If mild, may observe; if severe, blistering, or mucosal involvement — stop medication immediately; consider Stevens-Johnson syndrome/DRESS
Parent asks about driving/sports/swimming	Discuss seizure control; assess individual risk; review local regulations	Driving: typically seizure-free period required (varies by jurisdiction); swimming: supervised, no diving; sports: individualize based on seizure control

Status Epilepticus Management Algorithm

Definition: Seizure lasting greater than 5 minutes OR two or more seizures without return to baseline

Status epilepticus is a medical emergency. Time is brain — treatment should begin immediately.

Time	Stage	Action	Medication (Weight-Based Dosing)
0-5 minutes	Stabilization	ABCs; position; oxygen; glucose check; IV access; time seizure	—
5-10 minutes	First-line therapy	Benzodiazepine	IV lorazepam 0.1 mg/kg (max 4 mg) OR IV diazepam 0.2 mg/kg (max 10 mg) OR IM midazolam 0.2 mg/kg (max 10 mg) OR intranasal midazolam 0.2 mg/kg OR rectal diazepam 0.5 mg/kg
10-15 minutes	Repeat first-line	If still seizing, repeat benzodiazepine once	Same dose as above; maximum 2 doses of benzodiazepine
15-30 minutes	Second-line therapy	Antiseizure medication load	IV fosphenytoin 20 mg PE/kg (max 1500 mg PE) OR IV levetiracetam 60 mg/kg (max 4500 mg) OR IV valproate 40 mg/kg (max 3000 mg)
30-60 minutes	Refractory status	Repeat second-line agent OR proceed to third-line	May give additional second-line agent; prepare for anesthetic agents; ICU transfer
Greater than 60 minutes	Super-refractory status	Continuous infusion anesthetic; ICU care; continuous EEG	Midazolam infusion 0.1-0.4 mg/kg/hour OR pentobarbital OR propofol (caution in children — propofol infusion syndrome risk)

When to Refer to Pediatric Neurology

Urgent Referral (Within Days)

Suspected infantile spasms
New focal seizures
Seizures with developmental regression
Abnormal neuroimaging
Complex febrile seizures (especially if prolonged or multiple)
Neonatal seizures
Status epilepticus

Routine Referral (Within Weeks)

First unprovoked seizure
Suspected absence epilepsy
Suspected juvenile myoclonic epilepsy
Epilepsy not well-controlled on initial medication
Diagnostic uncertainty (seizure vs mimic)
Family request for subspecialty evaluation
Pre-surgical evaluation consideration

Troubleshooting Refractory Seizures

Ask These Questions When Seizures Are Not Controlled

Is this truly epilepsy? Up to 20-30% of patients referred for drug-resistant epilepsy have psychogenic non-epileptic seizures; video-EEG is essential
Is the diagnosis correct? Wrong syndrome diagnosis leads to wrong medication; reassess seizure type and syndrome
Is the medication appropriate for this seizure type? Some medications worsen certain seizure types (e.g., carbamazepine in absence epilepsy)
Is the dose adequate? Check drug levels; ensure therapeutic range
Is compliance good? Missed doses are a common cause of breakthrough seizures; non-judgmental discussion with family
Are there modifiable triggers? Sleep deprivation, alcohol (adolescents), medication interactions, illness
Is there a progressive underlying condition? Tumor, neurodegenerative disease, autoimmune encephalitis
Should surgery be considered? Focal epilepsy with identifiable lesion may be curable with surgery; refer to comprehensive epilepsy center
Are there alternative therapies? Ketogenic diet, vagus nerve stimulation, responsive neurostimulation

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from experience and avoid common mistakes

Must-Know Clinical Pearls

Time is critical in status epilepticus: Benzodiazepines become less effective as seizures continue due to GABA receptor internalization. Treat early and escalate quickly — do not wait to see if the seizure will stop on its own after 5 minutes.

Infantile spasms are a developmental emergency: Early treatment (within days of diagnosis) significantly improves cognitive outcomes. If you suspect infantile spasms (clusters of brief flexor or extensor movements), obtain an urgent EEG and refer immediately — do not wait for a routine neurology appointment.

Febrile seizures have an excellent prognosis: Simple febrile seizures do not cause brain damage, do not require antiseizure medications, and carry only a 1-2% risk of developing epilepsy. Reassure families — their child will be fine.

The history is your most valuable diagnostic tool: A detailed witness account of the event is worth more than any test. Ask witnesses to demonstrate what they saw. Video recordings on smartphones are invaluable — encourage families to record events.

Normal EEG does not exclude epilepsy: Up to 50% of children with epilepsy have a normal initial EEG. If the clinical history is convincing, do not dismiss the diagnosis based on a single normal EEG. Sleep-deprived EEG, repeat studies, or video-EEG may be needed.

Think about epilepsy syndromes, not just seizures: Identifying the specific epilepsy syndrome guides treatment selection, predicts prognosis, and may reveal important comorbidities. Ask: What type of seizure? What age of onset? What does the EEG show?

Genetic testing has transformed pediatric epilepsy: For children with early-onset epilepsy, developmental delay, or drug-resistant seizures, genetic testing can identify the cause in 30-40% of cases and may directly guide treatment (precision medicine).

Examine the skin in every child with seizures: Neurocutaneous syndromes (tuberous sclerosis, neurofibromatosis, Sturge-Weber) frequently present with epilepsy. A careful skin examination may provide the diagnosis. Use a Wood’s lamp for ash-leaf spots in fair-skinned children.

Benign epilepsy with centrotemporal spikes often does not need treatment: This common childhood epilepsy has an excellent prognosis with near-certain remission by adolescence. If seizures are infrequent and nocturnal, observation without medication is a valid choice.

Juvenile myoclonic epilepsy requires lifelong treatment: Unlike childhood absence and benign childhood epilepsies, juvenile myoclonic epilepsy typically does not remit. Most patients require lifelong medication. Counsel adolescents about the importance of compliance and avoiding triggers (sleep deprivation, alcohol).

Critical Pitfalls to Avoid

Using sodium channel blockers in Dravet syndrome: Carbamazepine, oxcarbazepine, lamotrigine, and phenytoin can trigger catastrophic status epilepticus in children with Dravet syndrome (SCN1A mutation). Always consider Dravet syndrome in any infant with prolonged febrile seizures and avoid these medications until the diagnosis is excluded.

Dismissing infantile spasms as “just startles”: Infantile spasms are subtle and easily missed. The brief flexor or extensor movements occurring in clusters may be mistaken for normal infant startle or colic. Delayed diagnosis leads to worse developmental outcomes.

Missing non-convulsive status epilepticus: A child who remains confused or obtunded after a convulsive seizure may be in non-convulsive status epilepticus. If mental status does not improve as expected, obtain an urgent EEG — the patient may need ongoing treatment.

Assuming all staring spells are absence seizures: Focal seizures with impaired awareness can present with staring and unresponsiveness. The distinction matters because treatment differs. True absence seizures are brief (less than 20 seconds), immediately interrupted by the end of the seizure, and show 3 Hz spike-wave on EEG.

Performing lumbar puncture without considering increased intracranial pressure: In a child with seizure and signs of increased intracranial pressure (papilledema, bulging fontanelle, focal deficits, Cushing triad), lumbar puncture can cause herniation. Obtain neuroimaging first if there is any concern.

Delaying antibiotics in suspected meningitis: If meningitis is suspected, give antibiotics immediately — do not wait for lumbar puncture or imaging. CSF culture may still be positive, and cerebrospinal fluid parameters remain interpretable for hours after antibiotic administration.

Forgetting to check glucose: Hypoglycemia is a reversible cause of seizures that causes ongoing neuronal injury. Always check point-of-care glucose in any seizing child. Treat immediately if low — do not wait for laboratory confirmation.

Labeling psychogenic non-epileptic seizures as “fake”: Psychogenic non-epileptic seizures are real symptoms of psychological distress, not malingering. These patients deserve compassionate care and appropriate mental health treatment, not dismissal. Video-EEG is needed to make this diagnosis.

Missing cardiac syncope misdiagnosed as seizure: Long QT syndrome can present with “seizures” that are actually cardiac arrhythmia-induced syncope. Clues include syncope with exercise, emotion, or swimming; family history of sudden death; and brief convulsive movements. Always obtain an ECG if syncope is in the differential.

Overlooking medication non-compliance: Before adding or changing medications for “drug-resistant” epilepsy, have an honest, non-judgmental conversation about compliance. Missed doses are one of the most common causes of breakthrough seizures, especially in adolescents.

Key Takeaways

Seizures are common in children, affecting 4-10% during childhood; most have excellent outcomes with appropriate management.
The distinction between provoked (acute symptomatic) and unprovoked seizures is fundamental — it determines prognosis and guides the decision to treat.
Febrile seizures are the most common seizure type in children; simple febrile seizures require only reassurance and fever source identification — not antiseizure medications or extensive workup.
Status epilepticus is a medical emergency; treatment should begin after 5 minutes of continuous seizure activity. Early treatment is more effective than delayed treatment.
Infantile spasms are a developmental emergency requiring urgent diagnosis and treatment. Any suspicion should prompt immediate EEG and neurology referral.
Identifying the specific epilepsy syndrome guides medication selection — some medications that help one syndrome can worsen another. Know which drugs to avoid in absence epilepsy, juvenile myoclonic epilepsy, and Dravet syndrome.
A normal EEG does not exclude epilepsy, and a normal physical examination does not exclude serious pathology. The clinical history remains the cornerstone of diagnosis.
Genetic testing should be considered early in infantile-onset epilepsy, epilepsy with developmental delay, and drug-resistant epilepsy — it may reveal the cause and guide precision treatment.
Many childhood epilepsy syndromes have excellent prognoses with high remission rates (childhood absence epilepsy, benign epilepsy with centrotemporal spikes). Provide families with realistic, hopeful counseling.
Children with epilepsy have high rates of comorbidities including learning disabilities, attention deficit hyperactivity disorder, anxiety, and depression. Address these to optimize quality of life.

Quick Reference Algorithm

Systematic Approach to Pediatric Seizures:

Stabilize: ABCs, position safely, time the seizure, check glucose, establish IV access
Stop the seizure: If greater than 5 minutes, initiate benzodiazepine; follow status epilepticus protocol if needed
Confirm: Was this truly a seizure? Obtain detailed history and consider mimics
Classify: Provoked vs unprovoked; focal vs generalized; identify epilepsy syndrome if applicable
Investigate: Guided by clinical presentation — EEG for all unprovoked seizures; MRI if focal features, abnormal exam, or developmental concerns; laboratory tests based on clinical suspicion
Treat: Address underlying cause for provoked seizures; individualize antiseizure medication decision for unprovoked seizures based on recurrence risk and family preference
Counsel: Educate family about seizure first aid, safety precautions, medication adherence, when to seek emergency care, and prognosis
Follow up: Ensure appropriate neurology referral; monitor treatment response; address comorbidities and quality of life