A nurse is administering furosemide (Lasix) to a client with heart failure. Which lab value should the nurse monitor most closely?

Question

This question is challenging the student to understand pharmacokinetics of Lasix, pathophysiology of heart failure, and what would lab needs to be monitored closely when giving this medication.

Answer 1

A. Hemoglobin

B. Sodium

C. Potassium

D. Platelet count

Answer: C. Potassium

Rationale: Furosemide is a loop diuretic that causes potassium loss, increasing the risk of hypokalemia, which can potentiate cardiac arrhythmias. Sodium may also decrease, but potassium is the most critical to monitor closely. Understanding which key electrolyte to monitor will help the student be a safe RN.