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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

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1 . Electroencephalography Definition

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  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

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