A 9-year-old with a first seizure in the emergency department
A 9-year-old girl is brought by ambulance after a 4-minute generalised tonic-clonic seizure at school. She was drowsy but rousable on arrival and has had no further seizure. She has no fever, no head injury and no known epilepsy. Her mother reports that over the past 3 months she has had several episodes of 'staring and chewing' in class, each lasting under a minute, from which she does not respond, and that she has become more clumsy, dropping cups. She takes no medication. Examination: weight on the 50th centile, GCS 15, no meningism, no rash, no focal weakness, fundi normal, no neurocutaneous stigmata. Capillary glucose 5.4 mmol/L, sodium 138 mmol/L, calcium 2.35 mmol/L, CRP 3 mg/L. She has been observed for 90 minutes and is now fully back to baseline.
1. Was this a febrile seizure, a first unprovoked seizure, or something else? Justify your classification and state what the history of staring spells adds.
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This is not a febrile seizure: there is no fever and no evidence of infection (normal CRP, no meningism). It is a provoked-vs-unprovoked question, and on the information given it is a first unprovoked generalised seizure - but the staring/chewing episodes change the framing.
Those episodes are focal impaired-awareness seizures (temporal-lobe semiology), and the new clumsiness suggests a progressive or expanding lesion or a developing epileptic syndrome. Taken together, the generalised convulsion may represent focal onset with secondary generalisation, not a primary generalised seizure.
Implications:
- The diagnosis is likely epilepsy (≥2 unprovoked seizures, or one plus a high recurrence risk), not a simple febrile or single reactive seizure.
- The history mandates urgent neuroimaging (MRI) and EEG, and changes counselling about recurrence risk and driving/school safety.
- It also means the emergency management question is not 'does she need admission for a first fit' but 'does she need investigation for a structural or progressive cause'.
2. List the investigations you would arrange and the time frame for each, explaining what each is for.
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| Investigation | Timing | Purpose |
|---|---|---|
| Capillary glucose, electrolytes, calcium, magnesium | Already done - repeat only if clinically indicated | Exclude reversible metabolic causes; do not repeat routinely |
| MRI brain with epilepsy protocol | Urgent - within days, not months | Look for a structural lesion (tumour, cortical dysplasia, mesial temporal sclerosis) given focal semiology and progressive clumsiness |
| EEG (sleep-deprived if possible) | Within 1–2 weeks | Support focal onset, identify interictal discharges, guide syndrome classification |
| Pregnancy test | Before any anticonvulsant in an adolescent girl | Safety |
| Toxicology screen | Only if history or examination suggests ingestion | Exclude provoked cause |
| Lumbar puncture | Not indicated - no fever, no meningism, immunocompetent, fully recovered | Avoid unnecessary invasive testing |
| Genetic testing | Only after MRI/EEG and neurology review | Not first-line |
Routine bloods, skull X-ray and CT head are not indicated in a fully recovered child with a normal neurological examination, but the focal features here override that general rule for MRI.
3. The parents ask whether she can go home today and whether she needs medication. Give your answer, with reasoning and safety advice.
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Disposition: She has returned to baseline, has no red flags for ongoing seizure, and has a normal neurological examination. She can be discharged home today with urgent outpatient neurology review and an expedited MRI - provided the family can observe her, has transport, and understands when to return. She should not be left unsupervised near water, heights or traffic until reviewed.
Why not admit everyone: a fully recovered child after a brief first seizure with normal examination does not need inpatient admission for observation alone. Why not simply reassure: the focal staring spells, the progressive clumsiness and the likely secondary generalisation are red flags that require prompt investigation, so discharge must be with a plan, not with reassurance alone.
Antiepileptic medication:
- A single brief generalised seizure does not by itself warrant long-term therapy.
- However, if the staring spells are confirmed epileptic (likely), she meets criteria for treatment, and the choice depends on the epilepsy syndrome - valproate is avoided in adolescent girls of childbearing potential where alternatives exist; levetiracetam or lamotrigine are common choices.
- Do not start medication in the emergency department before the EEG and neurology assessment unless she has a further seizure.
Safety advice: seizure first-aid, no driving, supervised swimming, inform the school, and a written emergency plan with when to call an ambulance (seizure >5 minutes or repeated seizures).