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Artifacts

practice for EEG registry

QuestionAnswer
What causes glossokinetic artifact and how do you monitor it? Artifact from tongue. tip of tongue is negative root is positive. ask patient to say lilt and la la la to prove artifact
Describe respiration artifact and how to monitor it. fairly rhythmic slow activity (moves with body) try to eliminate preposition head monitor by marking EEG recording with each inhale exhale
Describe EKG artifact and how to monitor now way to eliminate you can change montages or using an a1a2 montage.
Pacemaker artifact Fast spike. correlates with the ekg
Describe tremor artifact and how to monitor it. Rhythmic theta activity with myogenic potentials(muscle artifact) hz as the head or body tremors often seen in patients with Parkinson disease superimposed that occurs at- place emg electrodes on muscle that is tremoring
Describe electroretinogram artifact and how to eliminate it. Seen during photic. to stop or prove hold opaque card in front of eyes to see if it stops
Describe skin potential artifact and how to eliminate and monitor it. sweat causes slow waves or roiling delta. cool patient monitor sway with 2 leads on sweaty hands
How is 60 hz caused by electrostatic effects how to eliminate it caused by capacitance between 60 hs conductors examples (leads), power bed, lights, ect turn off. cover wires with a tower. if you are unable to get rid of 60 hz use a notch filter.
Describe electrode malfunction artifact and how to eliminate it caused by unstable electrode of high impedance replace
Describe an intravenous(IV) drip artifact and how to monitor it. type an X when you see it and then have the nurse unplug the pump and run on battery
Describe pulse artifact and how to monitor it periodic slow wave that has a sleight delay from but is time locked to the ekg waveform. Monitor by recording ekg
Describe muscle artifact and how to eliminate it. short duration potentials that usually occur in clusters of periodic runs. the can resemble cerebral spike discharges except cerebral spikes are of mush longer duration and will have a field. ask patient to relax..
Why is the use of high frequency filter(HFF) not recommended to reduce muscle artifact. Excessive high frequency filtering will reduce the amplitude of these fast potentials and will also change their form. Single muscle potentials my look like spikes and repetitive potentials look like cerebral fast waves.
What is the corneorentinal potential the cornea (front of eye) is positive and the retina is (back of the eye) is negative
Describe how to monitor eye movements artifact To distinguish eye movements from cortical slowing, place additional electrodes infraorbitally or on the outer canthus of each eye. Eye movements will be out of phase
List the types of cardiac artifacts and describe their morphology. qrs seen in scalp leads. pacemaker. pulse ballistocardiographic.
List the types of electrode artifacts and describe their morphology electrode pop. salt bridge e;electrode contact
What are the eye movement artifacts blink, eye flutter, lateral gaze, slow roving, satera rectus spike and rapid eye movements of REM
Created by: moeegtech