EEG

Question 1

Delta waves

Answer 1

0-4 Hz

Deep sleep, deep anesth

Question 2

Theta waves

Answer 2

4-8Hz

Drowsiness, light sleep

Question 3

Alpha waves

Answer 3

8-13Hz

pt is alert, relaxed w/eyes closed

Question 4

Beta waves

Answer 4

13-30 Hz

mental concentration, active, busy, or anxious

Question 5

WAR pattern

Answer 5

Widespread Alpha Rhythm

Seen w/low to moderate gas level in which alpha activity is enhanced widespread

Question 6

FIRDA

Answer 6

Frontal Intermittent Rhythmic Delta Activity

abnormal pattern

Question 7

PLEDS

Answer 7

Periodic Lateralized Epileptiform Discharges

seizure spikes

Question 8

Ictal

Answer 8

during seizures

Question 9

Interictal

Answer 9

in between seizures

Question 10

CSA

Answer 10

Compressed Spectral Array

pseudo 3D plot of EEG power spectral lines, resulting in a stack of sequential spectra

Question 11

DSA

Answer 11

Density (color density) Spectral Array

uses density of dots or color distribution to represent EEG power at each frequency in each epoch

Question 12

Gamma waves

Answer 12

Pattern of neural oscillation in humans with a frequency of 25-100 Hz (40Hz is typical)

Question 13

What cranial nerves are at risk during carotid endartarectomy?

Answer 13

CN V (mandibular) CN X (recurrent laryngeal) CN XII (hypoglossal)

Question 14

What plays the largest role in collateral perfusion during carotids?

Answer 14

Middle cerebral artery and the circle of willis

Question 15

What is the recommended anesthesia regimen for EEG in Carotids?

Answer 15

Iso or des with narcotic

AVOID Propofol (likely to cause burst suppression, rendering data unreliable)