Electrodes and Application

Question 1

With respect to the 10-10 system of electrode placement, which electrode site is lateral to T7?

Answer 1

T9

Question 2

Which electrode is medial to T8?

Answer 2

C6

Question 3

Which electrode is lateral to T8?

Answer 3

T10

Question 4

What is the acceptable application technique for disk electrodes per ACNS Guideline for LTM

Answer 4

Collodion. Paste alone is not recommended

Question 5

What is the recommended depth of sphenoidal electrodes?

Answer 5

3-4cm in the zygomatic arches

Question 6

Intracranial Electrodes are made from________

Answer 6

Platinum or stainless steel

Question 7

Sphenoidal electrodes record activity from the:

Answer 7

Mesial and anterior temporal lobe

Question 8

Which of the following is the appropriate construction for sphenoidal electrodes? Solid wire, solid needle, or flexible braided wire?

Answer 8

flexible braided wire

Question 9

Sphenoidal electrodes are placed by a technologist, physician, or neurosurgeon?

Answer 9

physician

Question 10

What type of electrode detects mesial temporal discharges better than sphenoidal and scalp electrodes but is less invasive than intracerebral, grid, and strip electrodes? Hint: no skull penetration is required.

Answer 10

Foramen ovale electrodes

Question 11

Which types of electrodes are not recommended for long term recordings?

Answer 11

needle electrodes, nasopharyngeal

Question 12

Why is it recommended that LTM scalp electrodes have holes in the top?

Answer 12

For periodic refilling with electrode conductant

Question 13

Name an MRI compatible material

Answer 13

Platinum and nichrome

Question 14

Describe the differences in placement of intracranial grids and electrode strips

Answer 14

Grids are placed epi- or subdurally over the cerebral cortex and require a craniotomy

Question 15

Foramen ovale electrodes record from which structure(s)?

Answer 15

Mesial temporal structures without requiring penetration of the skull