Myoclonic-atonic seizure in a boy with epilepsy with myoclonic-atonic seizures (polygraphic video-EEG)

Polygraphic video-EEG of 25-month-old boy with epilepsy with myoclonic-atonic seizures. (a) Before the attack, the boy was sitting with his back on his mother (1). He was suddenly thrown forward with slight elevation of both arms (2 and 3), and his trunk flexed at the waist (5). He quickly recovered from the attack. (b) The attack exactly corresponded to a generalized spike-and-wave complex at 2 Hz. The myoclonic EMG activity, involving the trapezius and sternocleidomastoid muscles, lasted for approximately 200 ms. Numbers in the photograph corresponded to those of the EEG. (Courtesy of Dr. H Oguni 2010.)