A nurse is caring for a client who has heart failure. Which of the following findings should the nurse report to the provider?

Potassium level 4.5 mEq/L (3.5 to 5.0 mEq/L).

Urinary output of 1,000 mL in 12 hr.

Chest X-ray showing cardiomegaly.

PaCO2 55 mm Hg (35 to 45 mm Hg).