Spike-and-slow-wave complex
A characteristic EEG pattern consisting of a sharp spike followed by a slow wave. Diagnostic marker in certain epilepsy syndromes.
Full Definition
A spike-and-slow-wave complex is a distinctive EEG pattern characterized by a sharp, high-amplitude spike immediately followed by a slower, rounded wave. This pattern is pathognomonic for certain epilepsy syndromes, particularly absence epilepsy when occurring at 3 Hz (three cycles per second). The complexes may occur in bursts during absence seizures or as isolated interictal discharges. Recognition of this pattern is essential for accurate epilepsy syndrome diagnosis and appropriate treatment selection.
Usage
Usage note: Hyphenate when used as a compound adjective. Note the frequency (e.g., 3 Hz) when clinically relevant.
In Context
- "The EEG showed characteristic 3 Hz spike-and-slow-wave complexes during the clinical absence seizure." — EEG interpretation report
- "Generalized spike-and-slow-wave complexes were noted in the interictal recording, supporting the diagnosis of childhood absence epilepsy." — Pediatric neurology consultation