- Shuffle
Toggle OnToggle Off
- Alphabetize
Toggle OnToggle Off
- Front First
Toggle OnToggle Off
- Both Sides
Toggle OnToggle Off
Front
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
PLAY BUTTON
PLAY BUTTON
18 Cards in this Set
- Front
- Back
|
List the types of cardiac artifacts and describe their morphology.
|
Electrocardiographic -QRS complex seen in the scalp leads
Pacemaker- Generalized high frequency polyphasic potentials of short duration Pulse- Periodic slow wave that occurs after the EKG artifact's peak by about 200 msec Ballistocradiographic (results from head or body movement with cardiac contractions)- similar in morphology to pulse but more widespread |
|
List the types of electrode artifacts and describe their morphology.
|
Electrode pop- very steep rise and a more shallow fall, resembles a calibration signal
Electrode Contact- sharp or slow waves of varying morphology and amplitude Electrode/lead movement-disorganized morphology, double phase reversals on noncerebral appearance Perspiration- low amplitude, rolling waves of greater than 2 seconds in duration Salt Bridge- low amplitude, typically only one channel, appears flat and close to isoelectric |
|
List the types of external device artifacts and describe their morphology.
|
50/60 Hz ambient electrical noise-medium to low amplitude monomorphic activity of 50 to 60 Hz
Intravenous drips- spike -like EEG potential which has the regularity of the drip Electrical devices; IV pumps, telephone, radio, TV - high amplitude, irregular, polyspike-like or spike-like activity Mechanical effects: ventilators, circulatory pumps-slow wave or a complex including a mixture of frequencies superimposed on a slow wave |
|
List the types of muscle artifacts and describe their morphology.
|
Glosskinetic (chew/swallow) - slowing with superimposed faster frequencies with maximal amplitude frontally
Photomyogenic (photomyoclonic) - frontal and periorbital time-locked artifact that occurs with photic stimulation Surface electromyography (scalp/facial muscle) - rhythmic activity of high amplitude and frequency most commonly seen in the temporal and frontal electrodes. |
|
List the types of ocular artifacts and describe their morphology.
|
Blink - bifrontal diphasic synchronous slow wave
Eye flutter - run of bifrontal spike and slow wave complexes Lateral gaze- rhythmic slow artifact seen in the frontal and temporal leads at a frequency less that 1 Hz Slow-Roving eye movements- low amplitude slowing of opposite polarity in the left and right frontotemporal regions Lateral rectus spike - single motor unit potential seen at F7 or F8 Rapid eye movements of REM sleep - asymmetric waves with a quicker rise than fall |
|
What EEG finding is most often associated with neonatal seizures due to interventricular hemorrhage, leukomalacia, infarcts?
|
positive central or temporal sharp waves
|
|
What EEG finding is most often associated with postnatal early infantile epileptic encephalopathy (EIEE) or neonatal myoclonic encephalopathy?
|
Burst suppression
|
|
What EEG finding is most often associated with infantile spasms?
|
hypsarrhythmia
|
|
What EEG finding is most often associated with Lennox-Gastault Syndrome?
|
1 to 2 Hz spike and wave complexes; aka, slow spike and wave
|
|
What EEG finding is most often associated with childhood absence epilepsy?
|
generalized 3 Hz spike and wave complexes
|
|
What interictal EEG finding are most often associated with generalized tonic-clonic seizures?
|
generalized spike and wave; paroxysmal fast activity
|
|
What EEG finding is most often associated with benign rolandic epilepsy?
|
central and temporal sharp waves that often have opposite polarity; a dipole is present
|
|
What EEG finding is most often associated with benign occipital epilepsy?
|
occipital sharp waves
|
|
What EEG finding is most often associated with versive or sensory seizures?
|
parietal sharp waves
|
|
What EEG finding is most often associated with focal motor seizures?
|
frontocentral sharp waves
|
|
What interictal EEG finding is most often associated with complex partial seizures?
|
temporal lobe sharp waves, especially from the anterior temporal area
|
|
What is the duration of a sharp wave?
|
70 to 200 msec
|
|
What is the duration of a spike?
|
Less than 70 msec
|
