A 9-year-old girl presents with frequent episodes of blank staring during class lasting 5-10 seconds, provoked by hyperventilation, with no postictal confusion. Vital signs: BP 110/68, HR 92, RR 18, Temp 37°C, SpO2 98%. She denies tongue biting or incontinence. EEG shows generalized 3-Hz spike-and-wave discharges during hyperventilation. Brain MRI is normal. She takes no antiepileptic medications. Which EEG pattern is most likely during these episodes?
- A)3 Hz spike and wave dischargesGABARITO
- B)Focal temporal sharp waves only during sleep
- C)Polyspike and wave discharges
- D)Hypsarrhythmia on EEG
- E)Oligoclonal IgG bands in CSF
Explicação
Typical absence seizures produce generalized 3 Hz spike and wave discharges on EEG. Hyperventilation commonly provokes these episodes by altering thalamocortical excitability. Ver explicação completa e trilha adaptativa →