A client with chronic kidney disease (CKD) has an arteriovenous (AV) fistula in the left forearm. Which observation by the nurse indicates that the fistula is patent?

A. A patent AV fistula allows adequate blood flow for hemodialysis. The presence of a bruit (a whooshing sound heard with a stethoscope) indicates blood is flowing through the fistula, confirming patency. B. A thrill is palpated, not auscultated. A thrill is a vibration felt over the fistula; hearing it with a stethoscope is not correct terminology. C. The left radial pulse being 2+ bounding indicates good peripheral circulation but does not specifically assess the status of the AV fistula. D. Distended, tortuous veins in the left hand can indicate venous congestion, which could signify that the fistula is not functioning properly.