Infusion of potassium.

Infusion of potassium. The nurse is caring for a client with a serum potassium of 3.2 mEq/L. The client is placed on a cardiac monitor and started on an IV infusion of 40 mEq KCL in 1000 ml of 5% dextrose in water. Which ECG findings indicate that the infusion of potassium should be stopped?