A 3-year-old child develops a febrile seizure lasting 25 minutes (prolonged), involving the left arm only (focal), during a fever of 38.5°C. This is the second febrile seizure this year; the first was a brief generalized one. The risk factor most strongly associated with subsequent epilepsy in this child is:

• A Age at first febrile seizure <18 months
• B Positive family history of febrile seizures
• C Temperature below 38.5°C at the time of the seizure
• D Complex febrile seizure features (focal, prolonged, multiple in 24 hours) ✓

Explanation

Complex febrile seizures (defined as prolonged >15 minutes, focal, or multiple within 24 hours) carry a significantly higher risk of subsequent epilepsy compared to simple febrile seizures. The absolute risk of epilepsy after a single simple febrile seizure is ~2%, rising to 4–6% after complex features, and particularly high if the complex seizure is prolonged (status febrile) or involves temporal lobe features. Mesial temporal lobe epilepsy (MTLE) with hippocampal sclerosis has a well-documented association with prolonged febrile seizures. Young age at onset increases recurrence risk, not necessarily epilepsy. Family history of febrile seizures does not independently predict epilepsy.

Reference: Ghai Essential Pediatrics, 10th ed.

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Written and medically reviewed by the StethoPrep medical team.