Epileptiform bursts are a specific EEG pattern characterized by a series of rapid, repetitive spikes or sharp waves that indicate abnormal electrical activity in the brain, typically associated with seizure activity. 1. Definition : o Epileptiform bursts consist of brief, high-frequency discharges that can appear as spikes or sharp waves. These bursts are indicative of underlying epileptic activity and can occur in various seizure types. 2. EEG Characteristics : o The bursts are often more monomorphic and stereotyped compared to non-epileptic bursts, exhibiting greater rhythmicity, especially in the faster frequency ranges. This distinct waveform helps differentiate them from other types of EEG activity, such as those seen in non-epileptic conditions. o Epileptiform bursts can vary in duration and frequency, and they may evolve into more complex patterns, such as generalized spike-and-wave discharges or other ictal patterns. 3. Clinical Significa
The electrodecremental pattern is a notable EEG finding associated with generalized-onset seizures and is characterized by a sudden and significant decrease in background amplitude. 1. Definition : o The electrodecremental pattern is defined by a sudden and generalized attenuation of the EEG signal, leading to a nearly isoelectric tracing across all channels. This pattern is often observed during seizures and can indicate significant cortical involvement. 2. EEG Characteristics : o The pattern typically begins with a high amplitude, generalized sharp wave, which is followed by a rapid and significant decrease in background amplitude (electrodecrement) that lasts approximately 1 second. After this initial decrement, fast (20 to 40 Hz) low-voltage rhythmic activity usually develops. o The activity may gradually increase in amplitude and decrease in frequency over the subsequent few seconds, often evolving into generalized paroxysmal fast activity (GPFA).