Patient preparation and study
What should be included in patient's history?
Chief complaint, previous medical history, meds, family history
What is the impact of electrode bridging?
It causes the channel to look flat
What are the typical frequency bands in a normal EEG?
0.5-4Hz- Delta- seen in deep sleep or during anesthesia.
4-8Hz- Theta- seen during drowsiness, light sleep or relaxation
8-13Hz- Alpha- during relaxed wakefulness, eyes closed
13-30Hz- Beta- during active thinking, alert
What effect do antiepiletic medications have on the EEG?
May suppress epileptiform activity.
What anatomical landmarks are used in the 10-20 system?
Nasion, inion and preauricular points.
How many identifiers should be used to verify a patient's identity?
2
What tools are needed to measure the 10 20 system?
Meauring tape and a skin safe marking pencil.
What should be documented by tech while running an EEG?
Behavioral changes, events such as twitching or staring and time stamping any interventions or patient reported symptoms.
How is the longitudinal measurement done?
Measure from nasion to inion
10% from nasion: FPz
20% from FPz: Fz, Cz, Pz
10% from inion: Oz
Why is it important to know what medications a patient is taking?
Certain medications can alter EEG patterns.
How is the transvere measurement done in the 10-20 system?
10% from L) preauricular: T3
20% increments from T3: C3, Cz, C4
10% from R) preauricular: T4