Is that an approved NANDA-I nursing diagnosis? If it isn't you can't use it. (Hint: while "risk for ineffective renal perfusion" is an approved nursing dx with risk factors listed (those would be your "related to (caused by)" ), "ineffective renal perfusion" is not an approved nursing dx and you can't use it for one.
Please get a better handle on how to formulate a nursing diagnosis statement, because it's one of the most common errors students make. You WILL need a NANDA-I 2012-2014, free 2-day shipping from Amazon for students, to be able to do this properly, even if the faculty forgot to put it on your reading list. This is not negotiable. This is what you need to know:
A nursing diagnosis statement translated into regular English goes something like this: "I think my patient has ____(diagnosis)_____________ . He has this because he has ___(related factor(s))__. I know this because I see/assessed/found in the chart (as evidenced by) __(defining characteristic(s))________________."