high-frequency oscillations
Also written as: HFOs — high-frequency oscillations
Brain waves above 80 Hz, considered biomarkers for epileptogenic tissue in seizure disorders.
Full Definition
High-frequency oscillations (HFOs) are brain electrical activities with frequencies typically above 80 Hz, subdivided into ripples (80-200 Hz) and fast ripples (200-600 Hz). These oscillations are increasingly recognized as important biomarkers for identifying epileptogenic brain tissue, as they occur more frequently in seizure-generating regions than in normal brain areas. HFOs can be recorded using specialized high-sampling-rate equipment and are thought to reflect hypersynchronous neuronal activity that underlies seizure generation. Their detection and analysis are becoming crucial tools in presurgical epilepsy evaluation and may improve surgical outcomes by better defining resection boundaries.
Usage
Usage note: Hyphenate when used as adjective; HFOs acceptable abbreviation in technical contexts.
In Context
- "High-frequency oscillations were significantly more abundant in the seizure onset zone." — Presurgical epilepsy evaluation
- "HFO analysis revealed pathological fast ripples in the mesial temporal structures." — Intracranial EEG report