EEG Activation Procedures 3

Question 1

What is the recommended distance between the photic stimulator and the patient's eyes during intermittent photic stimulation?

Accepted Answer

30 cm

Answer

5 cm

Answer

100 cm

Answer

200 cm

Question 2

Which activation procedure is most effective for provoking absence seizures during a routine EEG?

Accepted Answer

Hyperventilation

Answer

Intermittent photic stimulation

Answer

Sleep deprivation

Answer

Cold water caloric testing

Question 3

Eye closure sensitivity refers to which phenomenon during EEG recording?

Accepted Answer

Epileptiform discharges triggered specifically by the act of closing the eyes, distinct from normal alpha appearance

Answer

Alpha blocking when the eyes are opened

Answer

Increased muscle artifact when the eyes are shut tightly

Answer

Photic driving response with eyes closed

Question 4

What is the purpose of recording a period of wakefulness with eyes open and eyes closed before activation procedures?

Accepted Answer

To establish the baseline EEG background including posterior dominant rhythm frequency, reactivity, and symmetry

Answer

To test the patient's visual acuity

Answer

To reduce the total recording time needed

Answer

To calibrate the photic stimulator

Question 5

Reflex epilepsy triggered by specific cognitive tasks (such as reading or calculating) is an example of:

Accepted Answer

Cognitive activation of seizures (thinking epilepsy or praxis-induced epilepsy)

Answer

Photosensitive epilepsy

Answer

Normal hyperventilation response

Answer

Medication-induced seizures

Question 6

During photic stimulation, the technologist notices the patient becoming agitated and the EEG shows generalized spike-and-wave activity outlasting the flash trains. The appropriate action is to:

Accepted Answer

Immediately stop photic stimulation and continue recording the after-discharge

Answer

Increase the flash frequency to get a better sample of the response

Answer

Continue stimulation to determine the full extent of the response

Answer

Switch to hyperventilation immediately