EKG Question #7


A nurse is caring for a client who has chronic renal failure and presents with the following electrocardiogram (ECG):

Based on the ECG, the nurse expects to administer which medication to treat an electrolyte imbalance.


  1. Magnesium
    • Rationale:
  2. Kayexalate
    • Rationale:
  3. Spironolactone
    • Rationale:
  4. Potassium
    • Rationale:



Hyperkalemia may present ECG changes such as an elevated peaked T wave, prolonged PR interval, and widened QRS complex. High potassium levels must be treated as soon as possible. Kayexalate is a class of medications called cation-exchange resins and is used to treat high levels of potassium. It lowers potassium levels by binding the potassium in the intestines.

If potassium is elevated, magnesium levels may also be elevated, so the nurse would not administer either electrolyte. Spironolactone is a potassium sparing diuretic and would not be administered since potassium needs to be lowered.

Learning Outcomes

Test Taking Tip

Video Rationale