Final answer:
Electrical interference on a 12-lead EKG is likely due to improper electrode placement, which is a common source of artifacts in the EKG reading.
Step-by-step explanation:
An EKG technician should recognize that electrical interference on a 12-lead EKG tracing is most likely a result of improper electrode placement. Electrical interference can also be caused by other factors like excessive sweating, equipment malfunction, or the patient's heart rhythm. However, incorrect placement of electrodes is a common source of such artifacts in the EKG readings.
When performing an ECG, the standard 12-lead electrocardiograph uses 10 electrodes placed in standard locations on the patient's skin. These electrodes must be placed with care to ensure accurate readings of the heart's electrical activity. Portable ECG monitors, such as the Holter monitor, also rely on correct electrode placement for continuous heart monitoring.