Do you think the diagnosis alteration in tissue perfusion would work better? A nursing diagnosis has 3 components PES= Problem, etiology, and symptoms. You can sometimes leave out the symptoms. Carpenito is the best resource for this that I have found. Sorry, gave my book to the nursing school though.
Alteration in tissue perfusion to R arm r/t occluded dialysis graft, as evidenced by loss of palpable thrill, loss of audible bruit, cool extremity, diminished pulses, delayed cappilary refill, and dimished sensation.
Or alteration in safety r/t occluded dialysis graft with associated diminished sensation.
Now, you need a ref for the relationship of nerves needing/being perfused by a blood supply. Well, all my books are upstairs, and I am too lazy to run up there tonight. I would suggest you look in your big ol med-surg text. Check for the nursing interventions after neurovascular and ortho surgeries. Part of the routine nursing care is to check for temp, movement, sensation, and perfusion, (as I am sure you already know), so maybe they will have a rationale already listed there. Why work so hard to re-invent the wheel? Get the Carpenito book, you can try for a used one from your school book store, or try Snoozys.com . I always got used books from them. Or try the hospital or school library.
That is a bugger though isn't it. We KNOW that nerves are nourished by a blood supply, but where to find the reference. How about your anatomy and phys book? Betcha there's even a cool little picture! Good luck!!