What is a common symptom of a vascular access complication in dialysis patients?

B is the correct answer because symptoms at the vascular access site are critical indicators of potential complications in dialysis patients. Signs of swelling, abnormal sounds like bruit (a whooshing sound), or changes in the color or temperature of the access site can signal issues such as infection, thrombosis (clot formation), or stenosis (narrowing of the blood vessels). Monitoring these signs is essential for ensuring the functionality of the access site, which is vital for effective dialysis treatment.

Weight gain, increased thirst, and shortness of breath are also important symptoms to watch for in dialysis patients, but they are more related to fluid overload or electrolyte imbalances rather than direct complications at the vascular access site. Thus, they do not specifically highlight issues with the access itself, which is why understanding the signs and symptoms related to the access site is crucial for patient care.