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1. Electroencephalography Definition - EEG is a surface recording of the electrical activity of nerve cells of the brain - Electrode placement (10 / 20.

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Presentation on theme: "1. Electroencephalography Definition - EEG is a surface recording of the electrical activity of nerve cells of the brain - Electrode placement (10 / 20."— 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

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12 Epileptic potentials

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14 Epileptic Focus

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


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