EMG (Muscle) Artifact
EMG artifact originates from this physiological source.
What is muscle activity?
EKG artifacts are generated by this organ.
What is the heart?
Respiratory artifact is caused by this mechanical factor.
What is head/electrode movement during breathing?
Eye blinks produce large deflections in these electrodes.
What are the frontal electrodes (FP1, FP2)?
Define artifact in EEG.
What is any signal not originating from the brain?
Name two head regions where EMG artifact is most common.
What are frontopolar, temporal, and occipital regions?
EKG artifact is best monitored by placing electrodes here.
What are the left and right collar bones?
This condition often increases respiratory artifact in EEG.
What is hyperventilation or respiratory distress?
The cornea has this electrical charge compared to the retina.
What is positive?
The three key questions when faced with an artifact are: __________.
What is “What is it, how do I eliminate it, how do I monitor it?”
This muscle causes “lateral rectus spikes” seen during eye movement.
What is the lateral rectus muscle?
This artifact appears as a sharp, regular pulse triggered by a cardiac stimulator.
What is pacemaker artifact?
Parkinsonian tremor recorded on EEG is an example of what kind of artifact?
What is movement artifact?
When eyes close, they roll upward producing this phenomenon.
What is Bell’s phenomenon?
Sweat artifact is most often seen in which electrodes?
What are frontal electrodes?
What artifact is often mistaken for epileptiform discharges but lacks an after-going slow wave?
What is EMG artifact?
How can you differentiate between a true spike and an EKG artifact?
By comparing to the EKG channel — spikes won’t line up with QRS complexes.
Which tool can monitor respiration to help identify related artifact?
What are strain gauges, belts, thermistors, or thermocouples?
Light stimulation can cause this retinal artifact recorded in FP1 and FP2.
What is electroretinogram (ERG) artifact?
This artifact appears as very slow, swaying waves due to perspiration.
What is sweat artifact?
Excessive EMG from a tense patient can be reduced by __________
What is reassurance, relaxation, or sedation?
This vascular artifact produces slow waves lagging slightly behind the QRS.
What is pulse artifact?
Electrode movement caused by a pulsating artery under the scalp is called this.
What is pulse artifact?
Eye flutter artifact can mimic this type of brain wave activity
What are slow frontal waves?
Artifact recognition is critical because unrecognized artifacts can be misread as __________.
What are epileptiform discharges or abnormal activity?