While caring for a client with an arteriovenous (AV) fistula in the left forearm, the practical nurse (PN) observed a palpable buzzing sensation over the fistula. Which action should the PN take?

A. Loosen the fistula dressing: Not indicated unless the dressing is too tight, which is not mentioned. B. Document that the fistula is intact: A palpable thrill indicates patency; no intervention needed. C. Apply gentle pressure over the site: Could obstruct blood flow and damage the fistula. D. Report the presence of a bounding pulse: A thrill is expected and normal; not a sign of complication.