Final answer:
When monitoring a patient with renal failure on epoetin, the nurse should be observant for hypertension, which is a known adverse effect of epoetin treatment.
Step-by-step explanation:
The nurse caring for a client with renal failure who is receiving epoetin should monitor for several potential adverse effects due to the medication and the condition of the patient.
Among the listed options, hypertension is the correct one.
Epoetin stimulates the production of red blood cells, which can lead to increased blood viscosity and raised blood pressure.
While hypoglycemia can occur during insulin therapy or with pancreatic tumors that produce insulin (insulinomas), in renal dysfunction, there tends to be relatively hyperglycemia.
Hyperkalemia is also a concern in renal failure due to decreased excretion of potassium by the kidneys, but is not directly related to epoetin use.
Lastly, hypocalcemia could be a concern in renal failure since kidneys produce calcitriol, which aids in calcium absorption; however, it's not typically associated with epoetin treatment.