
Keywords: Vagus nerve stimulation; Efficacy; Epileptic spasms; Tonic spasms; Refractory epilepsy; Children; AE; Danti-epileptic drug; CSF; cerebrospinal fluid; EEG; electroencephalography; EMG; electromyography; ES; epileptic spasms; GABA; gamma-aminobutyric acid;