electrodecremental response
A sudden reduction or flattening of EEG activity during epileptic spasms, typically seen in infantile epilepsy syndromes.
Full Definition
An electrodecremental response refers to an abrupt decrease or suppression of electroencephalographic activity that occurs during epileptic spasms, particularly in infantile epilepsy syndromes such as West syndrome. This EEG pattern is characterized by a sudden attenuation of background rhythms and may be accompanied by high-amplitude slow waves. The electrodecremental response is considered an ictal EEG correlate of epileptic spasms and is an important diagnostic feature when evaluating pediatric patients with suspected epileptic encephalopathies. Recognition of this pattern is crucial for proper seizure classification and treatment planning.
Usage
Usage note: Often abbreviated as EDR in clinical notes; editors should ensure the full term is spelled out in formal reports.
In Context
- "The video-EEG monitoring revealed an electrodecremental response coinciding with each observed spasm." — Epilepsy monitoring unit report
- "Documentation should specify whether spasms are associated with an electrodecremental response on simultaneous EEG recording." — Clinical documentation guidelines