You should never strap anything around your fistula arm to stop the bleeding as cutting off the blood flow can cause your fistula to stop working.
I can understand that .. even though I use black straps .. they use the clamps at my unit but they are going to get rid of them but the straps are even tighter if I let the nurse put them on me. The nurse seems to think she needs to put them on me so tight or else I will bleed to death even though I don't have her put them on til I am done bleeding (I like to hold the area and only want the straps on loose to hold the bandages as I don't like them to be taped to me.)