What kind of seizure might show increased brain metabolic activity on EEG during the event?

• A. Reflex seizures
• B. Myoclonic seizures
• C. Gelastic seizures
• D. Absence seizures

Answer: (C)

Gelastic seizures are characterized by sudden bursts of laughter or giggling that can occur without an apparent cause. During these types of seizures, there is often an increase in brain metabolic activity, which can be reflected on an EEG. The underlying pathology frequently involves focal epilepsy, particularly in the hypothalamic region, which can lead to increased neuronal firing during the seizure event. This heightened activity results in distinctive EEG patterns that correlate with the clinical manifestation of the laughter characteristic of gelastic seizures.

In contrast, other types of seizures such as absence seizures might show a typical 3 Hz spike-and-wave EEG pattern but do not necessarily correlate with an increase in brain metabolic activity. Myoclonic and reflex seizures can involve brief muscle jerks and may have varying patterns of EEG activity, but they do not have the consistent associations with increased brain metabolism observed in gelastic seizures. Therefore, gelastic seizures stand out for their specific manifestation and the associated changes in brain activity as recorded through EEG.