Hello! I am new to this website and I already love it. I graduated in June and will be taking my NCLEX-RN exam very soon. I have been reviewing every day and must admit that my understanding for IV solutions are poor. I understand the tonocity of the solutions, but would like some examples of when a patient would need hypo-,iso-, and hypertonic solutions. Also, can anyone help me w/ IV rates in regards to what is considered a fast infusion? For example, one of my Kaplan review question rationale explains that an infusion of NS at 125mL/hr is too fast for someone with heart failure. Can someone please tell me what infusion rates are too slow, too fast, etc. Thank you in advance!