In what scenario should a nurse consider immediately stopping dialysis treatment?

In the context of dialysis treatment, a nurse should consider immediately stopping dialysis when the pulse rate is less than 50 beats per minute, as this indicates possible bradycardia, which can represent a significant clinical concern. A low pulse rate may suggest cardiac instability or other serious cardiovascular issues, and proceeding with dialysis in such a situation could exacerbate the patient's condition or lead to further complications. Close monitoring of vital signs, including heart rate, is essential during dialysis, and any substantial deviation from normal parameters warrants immediate evaluation and action to ensure patient safety.

While other options present varying degrees of patient comfort issues or concerns, they do not indicate an immediate risk to the patient's health as the critical bradycardia does. Therefore, the presence of a pulse rate below 50 is the most urgent situation that necessitates halting the dialysis procedure.