Epileptic Spasms and Neurophysiological Management

Epileptic spasms are brief, symmetrical or asymmetric contractions of axial and limb muscles that often occur in clusters and are associated with a distinct electroencephalographic pattern. They characterise several developmental and epileptic encephalopathies, most notably West syndrome, and carry a high risk of neurodevelopmental impairment if not promptly managed. Neurophysiological assessment, centred on electroencephalography, provides both diagnostic clarity and prognostic information, guiding treatment choice and timing. First-line medical therapies include hormonal agents and vigabatrin, yet a substantial proportion of patients remain refractory. In such cases, advanced monitoring techniques—such as video-EEG and multimodal functional imaging—offer detailed mapping of epileptogenic networks. Surgical strategies, including corpus callosotomy and focal resection or disconnection, are increasingly considered for selected patients, with decision-making informed by the symmetry of ictal waveforms, interictal discharge patterns and structural imaging. A comprehensive, multidisciplinary approach that integrates electrophysiology, neuroradiology and clinical neurology underpins the modern management paradigm for epileptic spasms, aiming to halt seizures, preserve cognitive potential and reduce long-term disability.

Research from Nature Portfolio

Recent studies have demonstrated that quantitative analysis of high-voltage slow waves on scalp EEG can predict outcomes following corpus callosotomy for epileptic spasms. By measuring interhemispheric delays between negative peaks, amplitude ratios and duration ratios of slow-wave discharges, investigators found that greater symmetry of these parameters was associated with better postoperative seizure control. Such objective indices may refine patient selection for callosotomy and improve prognostic counselling, emphasising the role of detailed ictal waveform analysis in surgical planning.

Epileptic Spasms and Neurophysiological Management publication trend

The graph below shows the total number of articles in epileptic spasms and neurophysiological management across all publications each year (not limited to Nature Index journals).

Technical terms

Epileptic spasm: a sudden, brief contraction or extension of the trunk and limbs that often occurs in clusters and defines certain childhood epileptic encephalopathies.

Hypsarrhythmia: an interictal EEG pattern of high-amplitude, irregular slow waves and multifocal spikes, most often seen in West syndrome.

Corpus callosotomy: a palliative surgical procedure severing the corpus callosum to prevent bilateral spread of epileptic discharges.

Video-EEG: combined video monitoring and electroencephalography that synchronises clinical behaviour with electrical brain activity.

Blood oxygen level-dependent response: fluctuations in MRI signal intensity that reflect haemodynamic changes linked to neuronal activation.

References

1. Symmetry of ictal slow waves may predict the outcomes of corpus callosotomy for epileptic spasms. Scientific Reports (2019).
2. Involvement of the Thalamus, Hippocampus, and Brainstem in Hypsarrhythmia of West Syndrome: Simultaneous Recordings of Electroencephalography and fMRI Study. American Journal of Neuroradiology (2022).
3. Epilepsy surgery for children with epileptic spasms: A systematic review and meta‐analysis with focus on predictors and outcomes. Epilepsia Open (2024).
4. Epileptic spasms in infants: can video-EEG reveal the disease’s etiology? A retrospective study and literature review. Frontiers in Neurology (2023).