Why does infantile epileptic spasms syndrome (IESS) occur with a variety of underlying conditions and why does it respond to adrenocorticotrophin hormone (ACTH)/corticosteroids? Our scoping review summarizes five hypotheses from the literature: gene/epigenetic regulation, stress/HPA axis activation, neuroinflammation/immune function, altered neuronal transmission, and metabolic dysfunction. Evidence for ACTH/corticosteroids altering these processes is limited. IESS likely involves interacting processes affecting neurodevelopment. Understanding aetiopathogenic mechanisms further may lead to improved therapies and outcomes.
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