Electrocardiographic artifacts in clinical practice: A logical approach to recognition and prevention

Figure 4 Patient-related motion artifacts. A: Classical Parkinson’s rest tremor. Note that the frequency of the artifact is approximately 5 Hz (200 microseconds interval). Note that lead 2 does not have an artifact, indicating that the artifact is coming from the left arm; B: Limb movement artifacts resembling polymorphic ventricular tachycardia. Note that the normal QRS complexes (orange circles) are marching through the artifacts; C: Intraprocedural spurious ST elevation due to lead movement (attached to the subcostal region) during respiration; D: Trembling during micturition, causing baseline high-frequency irregular artifacts; note that the stoppage of the act of micturition resolves the baseline artifact.