Neuro Lecture 1 Flashcards
EEG measure the spontaneous electrical activity of the what?
Superficial cortex
How many electrodes are placed on a person for an EEG?
20+
Who reads EEGs?
Neurologist who has fellowship training in neurophysiology
How many people will have an abnormal EEG?
8% of people. Must be clinically correlated for diagnosis
How many % of patients with epilepsy have a normal EEG?
20% (not sensitive, not specific)
Can an EEG measure activity deeper in the brain?
No
How long is a routine EEG for?
20-120 minutes
What can cause significant artifact on the EEG?
movement of muscles
ex- blinking eyes, moving arm, etc
Someone with a primary _________ epilepsy is unlikely to have a normal EEG.
generalized
What is an EEG where leads are kept on for 6+ hours (usually 8).
extended EEG
What is where the patient is discharged to go home with EEG recording, somewhat like a Holter monitor.
Ambulatory EEG
Leads are left on for 24-72+ hour, inpatient.
Video EEG (usually take off of all meds, usually for pre-op)
Are all EEGs done with video?
Yes
Subdural or stereotactic depth electrodes. Leads are used for stimulation and recording.
Implanted EEG
Done right before surgery (make sure you aren’t taking out the right area)
Benefits of implanted EEG
Incredible detail
can transmit information
What 2 things is a CT of the head excellent for showing?
Bone and blood
CT shows the ventricles reasonably well in adults and children > ___ years old. Grey-white matter contract is visible.
2 years old
Test where an area of the brain is turned off, then wake patient up and put then through a battery of tests.
Wada test
what type contrast is used for CT?
Iodine
why can’t you see the different in white and grey matter in infant CTs?
Don’t get myelin until about 18 months old
What type stroke will show up on CT?
hemorrhagic
What is the natural exposure from air, food, etc. in the USA?
3.1 mSv/year (about 4 in ABQ)
how much radiation is a CT of the head?
2.0 mSv
for the heart stress test, which has higher radiation exposure?
Thallium
