A nurse is preparing to administer intravenous furosemide to a client with acute kidney injury and pulmonary edema. What is the primary purpose of this medication in this context?

Choice A reason: Furosemide may lower blood pressure by reducing fluid volume, but this is a secondary effect. Its primary role in acute kidney injury with pulmonary edema is diuresis to reduce fluid overload, relieving pulmonary congestion rather than directly targeting hypertension, which is managed with other medications. Choice B reason: Furosemide, a loop diuretic, increases urine output by inhibiting sodium reabsorption in the loop of Henle, promoting fluid excretion. In acute kidney injury with pulmonary edema, this reduces fluid overload, alleviating lung congestion and improving respiratory function, making it the primary purpose in this context. Choice C reason: Furosemide does not directly correct hyperkalemia; it may indirectly lower potassium by increasing urine output in some cases. However, specific treatments like insulin or dialysis are used for hyperkalemia, making this an incorrect primary purpose for furosemide in this scenario. Choice D reason: Furosemide improves oxygenation indirectly by reducing pulmonary edema through diuresis, but its primary action is increasing urine output to remove excess fluid. Improved oxygenation is a secondary benefit, as fluid reduction decreases lung congestion, but the drug’s direct effect is on renal fluid excretion.