Simple febrile seizure is a well defined entity in pediatrics, with a fixed set of features. Let's check each statement against those features.
- Age 6 months to 6 years: this is exactly the accepted age window for simple febrile seizures, so the statement is correct.
- Lasts less than 15 minutes: duration under 15 minutes, with no recurrence in the same illness, is part of the very definition of a simple febrile seizure, so this statement is correct too.
- Rectal diazepam at onset of fever reduces recurrence: giving diazepam through the febrile illness is an established way to cut the chance of another seizure during that same illness, so this statement is correct.
- Oral phenobarbitone routinely started after the first episode: this is not standard practice. A single simple febrile seizure is benign, and phenobarbitone brings real side effects such as irritability and effects on learning, so doctors do not routinely start it after just one episode.
Since the first three statements match accepted teaching and only the phenobarbitone statement goes against it, that is the one that is NOT correct.
Let's summarize:
- Age range 6 months to 6 years and duration under 15 minutes both define a simple febrile seizure.
- Rectal diazepam during a febrile illness is an accepted way to reduce recurrence in that illness.
- Routine oral phenobarbitone after just one simple febrile seizure is not standard practice.
So the incorrect statement is the one about routinely giving oral phenobarbitone after the first episode.