What is a common feature of hypsarrhythmia observed in EEG recordings?

Hypsarrhythmia is characterized by a specific pattern on an EEG that is often associated with severe forms of epilepsy, particularly infantile spasms. The defining feature of hypsarrhythmia includes the presence of high-amplitude, irregular slow waves mixed with multifocal spikes. This chaotic and disorganized pattern illustrates the level of brain activity during this condition, differentiating it from other types of EEG patterns.

The presence of slow waves reflects the underlying brain dysfunction, while the multifocal spikes indicate areas of increased excitability within the brain. This combination creates the signature "chaotic" appearance of hypsarrhythmia, making it easier for clinicians to identify and diagnose the condition. Understanding these characteristics is essential for interpreting EEG results in the context of pediatric neurology and epilepsy management.