When the Nurse Caring for a Patient with an Atrioventricular

When the nurse caring for a patient with an atrioventricular (AV) fistula in the forearm assesses that a trill is absent when palpating the venous side of the fistula,the nurse should:

A) Inject the ordered amount of heparin into the fistula.
B) Apply warm compresses, and lower the arm below the heart level.
C) Send the patient to dialysis for remedy.
D) Report to the charge nurse that the fistula is occluded.