Which of the following is a common artifact observed during ECG readings?

Motion artifacts are common discrepancies in ECG readings that arise from patient movement or interference during the recording process. These artifacts can manifest as irregularities or baseline shifts in the ECG waveform, which can lead to misinterpretation of the heart's rhythm or rate. This is particularly important in clinical settings, where accurate readings are crucial for diagnosis and treatment decisions.

In contrast, the other options listed refer to actual cardiac rhythms or conditions rather than artifacts. Junctional escape rhythm, ventricular fibrillation, and atrial flutter are all arrhythmias that signify various underlying cardiac issues. They would not be considered artifacts because they represent genuine physiological phenomena, whereas motion artifacts are extraneous factors that can obscure the true cardiac signals being recorded. Understanding the difference between these artifacts and actual arrhythmias is vital for accurate ECG interpretation and patient care.