Absence seizure provocation during routine EEG: Does position of the child during hyperventilation affect the diagnostic yield?

Absence seizures are generalized epileptic seizures with a characteristic ictal electroencephalographic (EEG) pattern of generalized, 3 Hertz (Hz) spike-and wave discharges.1,2 The mean duration of an absence seizure is 4-20 seconds (range 3-40 seconds), and it begins and ends abruptly, manifesting as cessation of activity, unresponsiveness, and staring with/without eye flutter, lip-smacking or head dropping.

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