Certified Polysomnographic Technician (CPSGT) 2025 – 400 Free Practice Questions to Pass the Exam

The best method for correcting slow-wave artifact when two channels share the same reference is to re-reference to a point without artifact. This approach is effective because it allows for the elimination of the noise caused by the slow-wave artifact while retaining the relevant physiological signals captured in the leads. By selecting a reference point that is free from interference or distortion, the signals can be accurately represented and analyzed.

Using a reference point without artifact means that any common interference that may have affected both channels is minimized, which increases the reliability of the data. This technique is especially important in polysomnography, as it maintains the integrity of sleep stages and waveforms that are crucial for diagnosing sleep disorders.

Other options may not effectively address the issue. Simply re-referencing both leads to the same point may not correct the artifact if the selected point also picks up the same disturbance. Discarding the leads entirely would result in the loss of valuable information. Changing the reference electrode location can introduce additional complexities and may not guarantee a cleaner signal if the new location is also affected by noise. Thus, choosing a reference point without artifact is the most appropriate and effective solution.