What is the effect of Phenobarbital on the EEG?
Increased beta activity
A disease occurring only in females characterized by normal development
... [Show More] until 6 to 18 months of age, after which there is a quick deterioration of mental abilities.
Rett Syndrome
First clinical sign of Landau-Kleffner syndrome (LKS) is:
Aphasia
The etiology most commonly associated with LPDs/PLEDS is:
Ischemic Stroke
Wernickes area lies in the:
Posterior part of the superior temporal gyrus
The posterior cerebral artert supplies blood to the:
Visual Cortex
Acoustic neuromas arise from the following cranial nerve"
VII (vestibulocochlear nerve)
Where is the cingulate cortex located in relation to the Corpus Collosum?
Superiorly
Collateral perfusion is maintained by:
Circle of Willis
Which artery is formed by the joining of the vertebral arteries?
Basilar
Which blood vessel is most frequently involved in strokes?
Middle cerebral artery
Consciousness
reticular information
Rolandic Gyrus is located
Frontal and Parietal lobes
The most important source generator of the EEG is:
Pyramidal dendritic (PSPs)
Excessive beta frequency activity may be the result of what?
Skull breach
What principle applies to the EEG aplifier?
Common mode rejection
Marked amplitured assymetry
Consistent with asymmetry in amplitude on a referential recording of more than 50% amplitude
What is the duration of a 10 Hz wave at a display of 15mm/sec?
100 msec
Frequency
Influenced by sampling rate and measured in Hz
Damage to Wernickes area may result in:
Receptive/ fluent aphasia
The center for intellectual functions such as judgement, memory and problem solving:
Frontal Lobe
If the measurement between the preauricular point and T3 is 3.2cm, what is the distance between C3 and CZ?
6.4 cm
If the distance from the right preauricular to ROC measures 9cm, where should electrode T2 be placed?
3 cm out from RT preauricular point and 1 cm up.
Balanced electrode impendences are important to:
Lessen 60 Hz Interference
Balanced impendences allow you to:
Maximize common mode rejection
Impendence is the resistance of a part of the circuit to the passage of:
Alternating current
Which of the following measures the opposition to current flow when a known voltage is applied?
Impendence meter
When testing an OUTPATIENT which active tuberculosis, it is necessary for whom to wear a mask?
The patient to wear a mask
Which of the following is most closely related to the measurement of voltage in relation to current and resistance?
Ohm's law
Ohms Law :
V=IR
Alpha Coma can be caused by?
Cardiac arrest
A 0.5 Hz wave is enhanced without affecting a spike by using?
LFF 0.3 Hz
A 5 yo male with previously normal development, presents with sudden loss of language skills. EEG shows frequent epileptiform discharges during sleep. What could be considered a potential diagnosis?
Landau-Kleffner Syndrome
Landau-Kleffner Syndrome
where healthy children from 3-7 lose their ability to comprehend language and then speak it
-abnormal brain waves detected in EEG
-epilepsy, seizures
Of the following the best choice of reference to be used while recording is suspected temporal lobe epilepsy is:
CZ ref
A waveform of 0.5 HZ can be best enhanced with what filter off?
LF 0.3 HZ
Which combination of settings will help enhance a low voltage slow wave that is being masked by muscle activity?
Sensitivity 5/ LF 0.3 HZ/ HF 35 HZ
Which of the following settings could be used to reduce the effects of sweat artifact in a patient with asymmetrical low voltage fast activity?
Sensitivity= 5microvolts/mm, LF 5HZ, HF 70 HZ
Periodic discharges
Seen at nearly regular intervals and having a cycle length varying less than 50%.
According to the adult ACNS EEG terminology, a pattern can qualify as rhythmic or periodic as long as it continues for at least how many cycles?
6
According to the Adult ACNS terminology, a pattern that is bilateral, bisynchronous, and asymmetric, even if it has a restricted field, is termed
Generalized
Lambert-Eaton Syndrome
Antibodies agaisnt presynaptic calcium channels of the NMJ (neuromuscular juntion)
Tolosa-Hunt Syndrome
Inflammation of cavernous sinus
Related to orbital pseudotumor
Diagnosis of exclusion
Responds to steroids
Photomyogenic response may be enhanced by
alcohol or barbiturate withdrawal
Landau-Kleffner Syndrome is characterized by:
Electrical status elipticus of sleep
Which pattern is NOT the result of cerebral anoxia
Phantom spike and wave
In an EEG a surface negative wave will appear as:
Either an upward or downward deflection
positive polarity
Lambda
No difference in voltage between 1 and input 2
Equipotential
What is the duration of a 10 HZ wave at display of 15mm/sec
100msec
Which of the following represents a sharp wave?
70-200 msec
Given a voltage of 50 microvolts and a sensitivity of 10 microvolts/mm, what is the amplitude?
5mm
Bandwidth for routine EEG activity:
1-70 HZ
Benign epileptiform transients of sleep BETS
Peak at 30-60 years old
What is the characteristic of a triphasic wave?
They have a time lag from frontal to posterior head regions
Which of the following EEG patterns is least likely to be associated with clinical symptoms?
6 HZ spike and wave
What differentiates Lambda and Posts?
Occurs with eyes open
Which of the following best describes a bilateral synchrony?
Reflects rapid generalization from one or multiple sources.
It is common for FIRDA to?
React to stimulation
Photoparoxysmal responses are characterized by?
Generalized irregular spike and wave discharges or polyspike and wave bursts
Which scenario would be of diagnostic value?
Assymetric symmetry
A business associated agreement is required when?
Medical records are shared
Todd's Paralysis
Postictal weakness or paralysis that is often unilateral and resolves over 24 hours
Impendence can best be described as the:
Resistance to alternating current
What is the most common low grade tumor detected in adults with epilepsy
Astrocytoma
Digital EEG montages are reformatted by using?
System Reference
Very high voltage generalized, but anterior dominant fast activity appearing as continuous sleep spindles sometimes found in mental retardation has been referred to as:
Extreme spindles
Which of the following montages would best display the amplitude of a left temporal spike?
Left temporal to the contralateral
Which of the following is the most appropriate sampling rate that should be used for a HFF setting of 70 HZ according to Nyquist theory:
140 p/sec
Thiamine deficiencies
Beriberi and Wernicke-Korsakoff syndrome
Using the international 10/20 system electrode placement, if the distance from nasion to inion is 34 cm, what is the distance from FZ to OZ?
20.4 cm
In deepening coma, triphasic waves are most likely to?
Disappear
The fissure that separates the temporal lobe from the frontal lobe?
Sylvian
Sylvain Fissure
divides the temporal lobe from the frontal and parietal (longer on the left hemisphere)
What is the most prominent clinical feature of Dialantin toxicity?
Ataxia
ORDA is commonly seen in children with?
Absence Seizures
Phenobarbital causes what on an EEG
Beta activity
A medication you would expect to increase beta frequency activity
Xanax (Alprazolam)
A 25 yo female admitted with new onset psychosis was given 3 mg of Ativan prior to the EEG recording. How would this medication effect the EEG?
Increased Beta activity [Show Less]