Pathophysiology and Treatment of Infantile Spasms

Infantile spasms represent a severe form of early childhood epilepsy, typically emerging between three and twelve months of age. Clinically, brief, symmetric contractions of the neck, trunk and limbs occur in clusters against a backdrop of developmental stagnation or regression. The characteristic electroencephalogram pattern—hypsarrhythmia—is marked by chaotic, high‐amplitude slow waves and multifocal spikes. Underlying mechanisms converge on disrupted neuronal network synchrony, with an imbalance of excitatory glutamatergic and inhibitory GABAergic signalling during a critical period of cortical maturation. Genetic mutations, structural brain lesions, metabolic derangements and perinatal insults each precipitate a shared epileptogenic cascade. Inflammation and altered hypothalamic–pituitary–adrenal axis activity have also been implicated in driving both seizure generation and adverse neurodevelopmental outcomes. First‐line therapies comprise hormonal interventions—adrenocorticotrophic hormone or high‐dose corticosteroids—and vigabatrin, a selective GABA transaminase inhibitor. Early initiation of treatment is associated with higher rates of spasm cessation and improved cognitive trajectories. Adjunctive strategies may include ketogenic dietary therapies, emerging small molecules targeting synaptic receptors and tailored approaches informed by genetic diagnoses. Despite advances, one third of patients remain refractory, underscoring the need for deeper insight into underlying pathophysiology and novel precision treatments.

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Pathophysiology and Treatment of Infantile Spasms publication trend

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

Technical terms

Infantile spasms: A developmental epileptic encephalopathy in infancy characterised by clusters of brief axial muscle contractions.

Hypsarrhythmia: Chaotic, high‐amplitude EEG pattern with asynchronous slow waves and multifocal spikes typical of infantile spasms.

West syndrome: The clinical triad of infantile spasms, hypsarrhythmia and developmental regression.

Adrenocorticotrophic hormone (ACTH): A pituitary‐derived hormone used at high doses to treat spasms, likely via anti‐inflammatory and steroidogenic effects.

Vigabatrin: An antiepileptic drug that irreversibly inhibits GABA transaminase to increase inhibitory neurotransmitter levels in the brain.

References

1. Infantile Spasms: An Update on Pre-Clinical Models and EEG Mechanisms. Children (2020).
2. Biochemical mechanisms in pathogenesis of infantile epileptic spasm syndrome. Seizure (2023).
3. Genetic Advancements in Infantile Epileptic Spasms Syndrome and Opportunities for Precision Medicine. Genes (2024).
4. Involvement of Peripheral Monocytes with IL-1β in the Pathogenesis of West Syndrome. Journal of Clinical Medicine (2022).