A patient has recently started taking oral digoxin in addition to furosemide (Lasix) for control of heart failure. Which assessment finding by the nurse is most important to communicate to the physician?

A) Weight increase from 120 pounds to 122 pounds over 3 days.
B) Liver is palpable 2 cm below the ribs on the right side.
C) Presence of edema in the feet and ankles.
D) Serum potassium level is 2.2 mEq/L after 1 week of therapy.

The most important finding for the nurse to communicate to the physician when a patient is taking digoxin and furosemide for heart failure is a low serum potassium level. This can increase the risk of digoxin toxicity and potentially lead to life-threatening arrhythmias.

Explanation:

The most important assessment finding for the nurse to communicate to the physician when a patient is taking oral digoxin and furosemide (Lasix) for control of heart failure is a low serum potassium level of 2.2 mEq/L after 1 week of therapy (option D).

A low serum potassium level can increase the risk of digoxin toxicity, which can lead to life-threatening cardiac arrhythmias. Digoxin and furosemide both increase potassium excretion, so monitoring and maintaining normal serum potassium levels is essential in patients taking these medications.

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