A client admitted to the hospital has been placed on furosemide (Lasix) for the treatment of heart failure. Which side effect should the nurse monitor for associated with furosemide (Lasix)?

The correct answer is A: Hypokalemia. Furosemide is a loop diuretic that promotes the excretion of potassium in the urine, leading to potential hypokalemia. Low potassium levels can result in cardiac arrhythmias and muscle weakness. Monitoring potassium levels is crucial. Choices B, C, and D are incorrect. Hypertension (B) is not a common side effect of furosemide; it is used to treat hypertension. Hypoglycemia (C) is not directly associated with furosemide use. Hyperkalemia (D) is the opposite of what furosemide causes, making it an incorrect choice.