Electrolyte Imbalance in CHF Patient on Diuretics

A nurse is caring for a patient who was diagnosed with congestive heart failure (CHF) and is receiving diuretics to control fluid retention. During the morning assessment, the nurse notes that the patient reports increased swelling in their legs and a weight gain of 2 pounds since yesterday. The patient also has a heart rate of 110 beats per minute and a blood pressure of 130/85 mm Hg. Given this information, which electrolyte imbalance might the nurse anticipate as a potential concern due to ongoing diuretic therapy?