In DKA, the patient has hyperglycemia but there are pH changes that are happening as well. To treat the underlying cause, you are going to hang an insulin drip. As insulin transports glucose into the cells, it also carries in potassium (this is one method to treat hyperkalemia). Therefore, as you have a decrease in serum glucose, you also have a drop in extracellular potassium, which can cause life-threatening dysrhythmias from the hypokalemia. Before initiating insulin therapy, you should check the BMP and SBAR for some K supplementation.