A Patient Who Is Taking Digoxin Is Admitted to the Hospital

A patient who is taking digoxin is admitted to the hospital for treatment of congestive heart failure. The prescriber has ordered furosemide [Lasix]. The nurse notes an irregular heart rate of 86 beats per minute,a respiratory rate of 22 breaths per minute,and a blood pressure of 130/82 mm Hg. The nurse auscultates crackles in both lungs. Which laboratory value causes the nurse the most concern?

A) Blood glucose level of 120 mg/dL
B) Oxygen saturation of 90%
C) Potassium level of 3.5 mEq/L
D) Sodium level of 140 mEq/L

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