Hello everybody! Currently in the process of studying for my NCLEX-RN. Ashamed but not afraid to admit that this will be my 4th time taking it. I was wondering if someone can help me in understanding the difference between oxygenation, circulation, and a cardiac issue. A simple answer is fine. I'm mainly wondering about the symptomatic differences. I think it will help me in prioritization. Also, I know this forum is filled with advice already but feel free to throw some in if you so desire. Thanks!