Each Jerk Lasting 1–2 in Pediatrics — Case | Paediatric Neurology | SMLE Q#17352
SMLE Question #17352
Pediatrics
Paediatric Neurology
Last updated: February 2026
A 6-month-old boy is brought for evaluation of recurrent sudden flexor jerks of the neck, trunk, and upper limbs. Episodes occur in brief clusters, often within minutes of waking, with each jerk lasting 1–2 seconds. He returns to baseline between events. Over the past month, his developmental progress has plateaued. EEG shows a chaotic, disorganized background with high-voltage slow waves and multifocal spikes (hypsarrhythmia). What is the most likely diagnosis?
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