Redaction of false high frequency oscillations due to muscle artifact improves specificity to epileptic tissue
| Autor: | William C. Stacey, David Brang, Stephen V. Gliske, Sijin Ren |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Seizure onset zone
Electroencephalography Article 050105 experimental psychology 03 medical and health sciences Epilepsy 0302 clinical medicine Physiology (medical) medicine Humans 0501 psychology and cognitive sciences Intracranial electrodes In patient Muscle Skeletal Artifact (error) medicine.diagnostic_test Electromyography business.industry 05 social sciences equipment and supplies medicine.disease Sensory Systems medicine.anatomical_structure Neurology Automated algorithm Scalp Neurology (clinical) Artifacts business 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | Clin Neurophysiol |
| ISSN: | 1388-2457 |
| DOI: | 10.1016/j.clinph.2019.03.028 |
| Popis: | Objective High Frequency Oscillations (HFOs) are a promising biomarker of epilepsy. HFOs are typically acquired on intracranial electrodes, but contamination from muscle artifacts is still problematic in HFO analysis. This paper evaluates the effect of myogenic artifacts on intracranial HFO detection and how to remove them. Methods Intracranial EEG was recorded in 31 patients. HFOs were detected for the entire recording using an automated algorithm. When available, simultaneous scalp EEG was used to identify periods of muscle artifact. Those markings were used to train an automated scalp EMG detector and an intracranial EMG detector. Specificity to epileptic tissue was evaluated by comparison with seizure onset zone and resected volume in patients with good outcome. Results EMG artifacts are frequent and produce large numbers of false HFOs, especially in the anterior temporal lobe. The scalp and intracranial EMG detectors both had high accuracy. Removing false HFOs improved specificity to epileptic tissue. Conclusions Evaluation of HFOs requires accounting for the effect of muscle artifact. We present two tools that effectively mitigate the effect of muscle artifact on HFOs. Significance Removing muscle artifacts improves the specificity of HFOs to epileptic tissue. Future HFO work should account for this effect, especially when using automated algorithms or when scalp electrodes are not present. |
| Databáze: | OpenAIRE |
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