Which medication is most likely to increase urine flow?

Furosemide

Spironolactone

Hydrochlorothiazide

Mannitol

Answer and Explanation

The Correct Answer is A

Choice A reason: Furosemide, a loop diuretic, inhibits the sodium-potassium-chloride cotransporter in the thick ascending limb of the loop of Henle, preventing sodium and water reabsorption. This increases urine output significantly, often within minutes, making it highly effective for conditions like edema or heart failure, producing a rapid diuresis of up to 20% of filtered sodium.

Choice B reason: Spironolactone, a potassium-sparing diuretic, inhibits aldosterone in the distal tubule, reducing sodium reabsorption and increasing urine output. However, its diuretic effect is weaker than furosemide, as it affects only 2-3% of filtered sodium. It is primarily used for managing hyperaldosteronism or potassium retention, not rapid urine flow increase.

Choice C reason: Hydrochlorothiazide, a thiazide diuretic, inhibits sodium-chloride reabsorption in the distal convoluted tubule, increasing urine output. Its effect is milder than furosemide, impacting about 5-10% of filtered sodium. It is commonly used for hypertension but is less potent for rapid diuresis in conditions requiring significant urine flow.

Choice D reason: Mannitol, an osmotic diuretic, increases urine flow by preventing water reabsorption in the proximal tubule and loop of Henle. It is effective in acute settings like cerebral edema but less commonly used for routine diuresis compared to furosemide, which has a broader and more rapid effect on urine output.

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Correct Answer is C

Explanation

Choice A reason: Bladder cancer primarily affects the bladder, causing hematuria or obstruction, leading to post-renal injury, not intra-renal. Intra-renal damage involves nephron injury, which is less likely with bladder cancer unless advanced metastasis affects kidneys, making this patient less at risk than one on nephrotoxic chemotherapy.

Choice B reason: Benign prostatic hyperplasia causes urinary obstruction, leading to post-renal kidney injury from backpressure, not intra-renal damage. The kidneys’ nephrons are not directly harmed by BPH, making this 65-year-old male less at risk for intra-renal injury compared to a patient receiving nephrotoxic drugs.

Choice C reason: Chemotherapy, especially agents like cisplatin, is nephrotoxic, causing intra-renal acute kidney injury by damaging renal tubules. This 25-year-old female faces high risk due to direct tubular toxicity, leading to acute tubular necrosis, making her the most likely to develop intra-renal injury among the options.

Choice D reason: Renal artery stenosis causes pre-renal kidney injury by reducing renal perfusion, not intra-renal damage. The nephrons remain intact unless chronic ischemia leads to secondary damage. This 36-year-old female has a lower risk of intra-renal injury compared to the chemotherapy patient’s direct nephrotoxic exposure.

A. Lithium toxicity is likely in the client’s treatment B. Lithium is completely metabolized by the liver so liver function tests are indicated C. Lithium requirements increase with stress so additional lithium may be required D. Lithium has a very narrow therapeutic range so lithium levels should be obtained

Correct Answer is D

Explanation

Choice A reason: Lithium toxicity is a concern but not inevitable. It occurs with levels above 1.5 mEq/L, often due to dehydration or drug interactions, common in trauma settings. However, routine monitoring of levels is a more immediate nursing priority than assuming toxicity, as early detection prevents severe outcomes like seizures or renal damage.

Choice B reason: Lithium is primarily excreted by the kidneys, not metabolized by the liver. Liver function tests are not indicated for lithium monitoring, as it does not undergo hepatic metabolism. This statement is inaccurate, as renal function tests are critical to assess lithium clearance and prevent toxicity in trauma patients.

Choice C reason: Stress does not directly increase lithium requirements. Trauma-related dehydration or renal impairment can elevate lithium levels, risking toxicity, but this is due to reduced clearance, not increased need. This statement is inaccurate, as dosing adjustments should be based on serum levels, not stress alone.

Choice D reason: Lithium has a narrow therapeutic range (0.6-1.2 mEq/L), and trauma-related factors like dehydration or medications can alter levels, risking toxicity or subtherapeutic effects. Regular serum level monitoring is critical, especially in acute settings, to ensure safety and efficacy, making this statement accurate and a priority nursing concern.

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Which medication is most likely to increase urine flow?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

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Explanation

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