Image:BaselineDrift.png| Baseline drift. The amplifier in the ECG machine has to re-find the 'mean'. This often occurs right after lead connection and after electric cardioversion.
Image:cardioversion_from_afib.jpg| Cardioversion from atrial fibrillation to sinus rhythm, with clear baseline drift.
Image:electric_noise_ecg.png| Electrical interference from a nearby electrical appliance. A typical example is a 100 Hz background distortion from fluorescent lights. Not to be confused with [[
Image:electric_noise_ecg2.jpg| Another example of an artefact caused by an electrical appliance. The patients rhythm is regular. This strip shows 10 QRS complexes.