Electrodes and Application Flashcards
With respect to the 10-10 system of electrode placement, which electrode site is lateral to T7?
T9
Which electrode is medial to T8?
C6
Which electrode is lateral to T8?
T10
What is the acceptable application technique for disk electrodes per ACNS Guideline for LTM
Collodion. Paste alone is not recommended
What is the recommended depth of sphenoidal electrodes?
Inserted bilaterally through the skin below the zygomatic arches in the direction of the foramen ovale by an EEG or qualified physician, Flexible wire placed 3-4cm
Intracranial Electrodes are made from________
Platinum or stainless steel
Sphenoidal electrodes record activity from the:
Mesial and anterior temporal lobe
Which of the following is the appropriate construction for sphenoidal electrodes? Solid wire, solid needle, or flexible braided wire?
flexible braided wire
Sphenoidal electrodes are placed by a technologist, physician, or neurosurgeon?
physician
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.
Foramen ovale electrodes
Which types of electrodes are not recommended for long term recordings?
needle electrodes, nasopharyngeal
Why is it recommended that LTM scalp electrodes have holes in the top?
For periodic refilling with electrode conductant
Name an MRI compatible material
Use of nonferrous metals such as platinum and nichrome allows MRI verification of electrode location
Describe the differences in placement of intracranial grids and electrode strips
Grids are placed epi- or subdurally over the cerebral cortex and require a craniotomy
Foramen ovale electrodes record from which structure(s)?
Mesial temporal structures without requiring penetration of the skull
