Detection of seizure onset in childhood absence epilepsy.

• Early detection of the onset of childhood absence seizures is mandatory to deliver an external stimulation able to inhibit them. • An on-line process is developed to detect the onset of absence seizures from four scalp EEG electrodes. • The proposed unsupervised solution detects most seizure onsets within a very short delay of 200 or 500 ms. This study aims to detect the seizure onset, in childhood absence epilepsy, as early as possible. Indeed, interfering with absence seizures with sensory simulation has been shown to be possible on the condition that the stimulation occurs soon enough after the seizure onset. We present four variations (two supervised, two unsupervised) of an algorithm designed to detect the onset of absence seizures from 4 scalp electrodes, and compare their performance with that of a state-of-the-art algorithm. We exploit the characteristic shape of spike-wave discharges to detect the seizure onset. Their performance is assessed on clinical electroencephalograms from 63 patients with confirmed childhood absence epilepsy. The proposed approaches succeed in early detection of the seizure onset, contrary to the classical detection algorithm. Indeed, the results clearly show the superiority of the proposed methods for small delays of detection, under 750 ms from the onset. The performance of the proposed unsupervised methods is equivalent to that of the supervised ones. The use of only four electrodes makes the pipeline suitable to be embedded in a wearable device. The proposed pipelines perform early detection of absence seizures, which constitutes a prerequisite for a closed-loop system. [ABSTRACT FROM AUTHOR]