Читать книгу Neurology - Charles H. Clarke - Страница 140

The most common is high amplitude frontal activity from scalp muscle contraction and eye movements.

Figure 4.7 Normal EEG followed by frontal spike‐and‐wave. E: eye movement artefact.

Sharp waves describe non‐sinusoidal waveforms seen in the normal population – not diagnostic of epilepsy, but may occur in patients with seizures.

Difficulties surround EEG reports. Conclusions can only be reached within a clinical context. Useful questions:

 Is there generalised epileptic activity? Is there localised epileptic activity?

 Is there generalised or localised abnormal slow wave activity, and could slow waves be seen in the normal population?

 Are the sharp waves reported normal?

 In coma, is there any EEG responsiveness to stimulation?