Homework Answers
7. a) An artifact occurs when there is interference from signals other than the heart's electrical signal.
b)some causes for artifacts are :
- loose electrodes
- dry electrodes
- when the patient is shivering , it can cause muscle tremor artifacts
- electromagnetic interference due to mobile phones or other devices using electromagnets.
- CPR compression artifact
- artifact caused due to neurostimulators and such other equipment
- pacing spike in people with pacemakers
c)how can artifacts be prevented:
- position the patient in supine or semi fowler's position when taking the ECG
- Encourage the patient to place their arms on their sides and relax their shoulders
- keep all electromagnetic devices including cell phones away from the patient.
- avoid moist skin. dry the skin well before placing the electrodes
- ensure good electrode skin contact by shaving any hair that may be present on the chest.
- remove oils from the skin at the electrode placement site by rubbing with alcohol.
- avoid putting the electrode on bones and areas with lots of muscle mass
- ensure that the gel is still moist on the electrodes.
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