Just recently the discussion came up once again on what sort of infusion should be used in patients with hyperkalemia. To my surprise the idea seems to persist that normal saline (NS) should be used, as this solute does not contain any further potassium. This is a thought in the wrong direction and Pulmcrit made a great statement in 2014 to clarify this myth. The key points are as follows:
Here's all the background reading including references:
Pulmcrit Myth-busting: RL is safe in hyperkalemia, and is superior to NS
This might also be of interest. Have a very close look on normal saline infusions:
Normal Saline and Acidosis: Is it Really the Salt that Matters?