What we were taught was to palpate first...to feel for the thrill...and if you could not feel it then to get your scope and listen for the bruit. If you could not feel or hear then you had to notify the Charge RN...who then would call the MD. I am not really sure what you are looking for besides that.
If you go to NKF DOQI guidelines you can probably find good material under vascular access guidelines. Also ANNA has alot of good educational material. Doesn't your unit/region have an inservice/education coordinator? I find at our unit, the techs, who do 99% of the cannulation, do not EVER listen with a stethocope, nor does the RN.
feel a thrill--hear a bruit.
if you can't find either, don't stick.
if you listened to the access every treatment, you would be able to detect changes such as possible stenosis. however, rarely does the same nurse have the same patient every day.