1 / 15

1 . Electroencephalography Definition

1 . Electroencephalography Definition - EEG is a surface recording of the electrical activity of nerve cells of the brain   - Electrode placement (10 / 20 – System, international). - Electrodes are connected with electroencephalograph, which amplifies

phelan-mcmillan
Télécharger la présentation

1 . Electroencephalography Definition

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 1.Electroencephalography • Definition • - EEG is a surface recording of the electrical activity of nerve cells of the brain •   - Electrode placement (10 / 20 – System, international) - Electrodes are connected with electroencephalograph, which amplifies the brain activity a million times record it on a strip of paper or stores it electronically.

  2. Main Types of Waves in EEG

  3. EEG of a normal awake person consists alpha and some low amplitude beta activity:

  4. During normal sleep EEG consists spindle activity (10 – 14 Hz)

  5. EEG – abnormalities: - Slow wave abnormalities  the slower, the more severe is the abnormality -   Epileptiform activity  sharp waves, spikes, spike and waves - Suppression of activity  attenuation or absence of activity

  6. Indication for EEG: • Seizure disorders (Location of the focus, type of seizure disorder) • Evaluation of transient spells (Transitory Ischemic Attack TIA, Residual Ischemic Neurological Deficit RIND, Completed Infarction / Syncope or hysterical episodes) • Intracranial disease process (tumor, abscess) • Diffuse disturbances of cerebral function (metabolic disorder, encephalitis, and degenerative process, eg. v.Creutzfeldt - Jakob disease) • Coma (status epilepticus, drug overdose, hepatic coma) • Brain death (ceased activity)

  7. Intracranial Causes:

  8. Extracranial Causes

  9. Simple Partial Seizures

  10. Complex Partial Seizures

  11. Epileptic potentials

  12. Epileptic Focus

  13. NMDA = N-methyl – D – aspartate AMPA = α – amino – 3 – hydroxy – 5 – methylisoxazole – 4 – propionate

More Related