Infantile spasm: a review article.

Area of Science:

• Neurology
• Pediatric Neurology
• Epileptology

Background:

• Infantile spasm (IS) is a severe epileptic encephalopathy historically described as West's syndrome.
• It is characterized by brief, symmetric axial muscle contractions (spasms), characteristic electroencephalogram (EEG) abnormalities (hypsarrhythmia), and neurodevelopmental regression.
• IS typically occurs in the first year of life, with a peak onset between 3-7 months, affecting approximately 1 in 2000-4000 live births.

Purpose of the Study:

• To provide a comprehensive overview of infantile spasms (IS), including its clinical presentation, diagnostic hallmarks, and etiological classification.
• To highlight the significance of hypsarrhythmia as the EEG hallmark of IS.
• To differentiate between symptomatic, cryptogenic, and idiopathic classifications of IS based on etiology and developmental status.

Main Methods:

• Review of historical and clinical literature on infantile spasms.
• Description of the characteristic clinical features and EEG patterns (hypsarrhythmia).
• Classification of IS based on etiology: symptomatic, cryptogenic, and idiopathic.

Main Results:

• Infantile spasms present as brief, symmetric axial muscle contractions, often involving flexors and extensors.
• Hypsarrhythmia, a chaotic EEG pattern, is the hallmark of IS.
• The prognosis for IS is generally poor, with most cases occurring before age two.

Conclusions:

• Infantile spasms represent a significant challenge in pediatric neurology due to their severity and poor prognosis.
• Accurate classification into symptomatic, cryptogenic, or idiopathic categories is crucial for understanding the underlying causes and guiding management.
• Early recognition and diagnosis, supported by characteristic clinical and EEG findings, are essential for affected infants.