the average electrical activity of millions of neurons

Sharp spikes on EEG may suggest

epileptic spikes; organized discharge

When are EEG's useful?

When trying to tell if a shaking episode is epilepsy, when attempting to determine consciousness, somewhat useful in detecting the absence of brain activity

Absence seizures are usually seen in

children. A form of generalized seizure

EEG in Absence Seizures

Have a characterstic EEG pattern which is virtually diagnostic. Require specific anti-epileptic medications

NCSE is an ongoing seizure which has little if any movement associated with it – the patients are poorly responsive but the etiology is unclear. EEGs in this case are

helpful to diagnose pt with epilepsy

Structural brain lesion on MRI

indicates likelihood patient will have further seizures

Usually requires an EEG recording during an episode for proper diagnosis (video/EEG). Often is the result of significant emotional trauma such as prior physical, sexual or emotional abuse. Pseudoseizures do not respond to epilepsy meds

EEG waves over a lesion or a mass

muted or slowed. In the past, was used to locate mass lesion. Today, we use imaging

usually indicates brain death. However, there are patients who meet criteria for brain death who still have some EEG activity

Nerve conduction studies

how fast does the electric activity get to the point of interest, and how much electricity gets there. (timing and amplitude)

axonal injury affects

amplitude or size, not speed(demyelination affects speed)

When is an EMG/NCV useful?

They are potentially useful whenever there is a suspicion of peripheral nerve or muscle injury. Good for detecting Carpel tunnel Syndrome, Very good for investigating polyneuropathy. Sometimes useful for radiculopathy or muscle diseases

Evoked Potential Studies

Evoked Potential Studies are electrical studies used to study the conduction of central nervous system pathways

Three types of evoked potential studies

visual, brainstem (auditory), somatosensory

In what diseases is evoked potential useful for diagnosis?

somatosensory Evoked Potentials are useful in Multiple sclerosis, spinal cord diseases, and certain other specific circumstances. Otherwise, they are not used frequently

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DM EEG EMG

Neurology EEG and EMG testing

Question	Answer
EEG measures	the average electrical activity of millions of neurons
Sharp spikes on EEG may suggest	epileptic spikes; organized discharge
Patients with seizures can have _____ EEGs	normal
When are EEG's useful?	When trying to tell if a shaking episode is epilepsy, when attempting to determine consciousness, somewhat useful in detecting the absence of brain activity
Absence seizures are usually seen in	children. A form of generalized seizure
EEG in Absence Seizures	Have a characterstic EEG pattern which is virtually diagnostic. Require specific anti-epileptic medications
NCSE is an ongoing seizure which has little if any movement associated with it – the patients are poorly responsive but the etiology is unclear. EEGs in this case are	helpful to diagnose pt with epilepsy
If a person has a focal seizure they are likely/unlikely to develop additional seizures because the seizure is due to some focal lesion	Likely!
What EEG sign indicates likelihood of further seizures?	epileptiform discharges
Structural brain lesion on MRI	indicates likelihood patient will have further seizures
How long after a seizure should a patient not drive?	6 months
Pseudoseizures	Usually requires an EEG recording during an episode for proper diagnosis (video/EEG). Often is the result of significant emotional trauma such as prior physical, sexual or emotional abuse. Pseudoseizures do not respond to epilepsy meds
EEG waves over a lesion or a mass	muted or slowed. In the past, was used to locate mass lesion. Today, we use imaging
Flat EEG	usually indicates brain death. However, there are patients who meet criteria for brain death who still have some EEG activity
electrical study of the muscle activity is called	Electromyography
Nerve conduction studies	how fast does the electric activity get to the point of interest, and how much electricity gets there. (timing and amplitude)
axonal injury affects	amplitude or size, not speed(demyelination affects speed)
EEG and EMG accuracy depend on	user skill
When is an EMG/NCV useful?	They are potentially useful whenever there is a suspicion of peripheral nerve or muscle injury. Good for detecting Carpel tunnel Syndrome, Very good for investigating polyneuropathy. Sometimes useful for radiculopathy or muscle diseases
Evoked Potential Studies	Evoked Potential Studies are electrical studies used to study the conduction of central nervous system pathways
Three types of evoked potential studies	visual, brainstem (auditory), somatosensory
EMG and NC look at the _____ system, while Evoked potential looks at the _______ system	PNS; CNS
In what diseases is evoked potential useful for diagnosis?	somatosensory Evoked Potentials are useful in Multiple sclerosis, spinal cord diseases, and certain other specific circumstances. Otherwise, they are not used frequently

Created by: ltm12

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