In hypovolemic hyponatremia with urine greater than 20 mEq/L, which medication class is a common cause?

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Multiple Choice

In hypovolemic hyponatremia with urine greater than 20 mEq/L, which medication class is a common cause?

In hypovolemic hyponatremia, the kidneys normally conserve sodium to help restore volume, so urine sodium is typically low (less than about 20 mEq/L). If you see a urine sodium greater than 20 mEq/L in this setting, it means the kidneys are losing sodium rather than conserving it, pointing to a renal source of natriuresis. The most common medication class that causes this pattern is diuretics. Loop diuretics and thiazide diuretics promote Na loss in the nephron, which increases urine sodium and can contribute to volume depletion and dilutional hyponatremia when water intake continues. Hormonal or adrenal factors can also cause salt wasting, but among medication classes, diuretics are the classic culprit for this high urinary sodium in a hypovolemic patient. References to the other options: ACE inhibitors can influence fluid and electrolytes but are not the typical driver of high urine sodium in this context. Mineralocorticoid deficiency causes salt wasting via lack of aldosterone but is not a medication class. The last option describes the physiologic situation rather than a drug class.

In hypovolemic hyponatremia, the kidneys normally conserve sodium to help restore volume, so urine sodium is typically low (less than about 20 mEq/L). If you see a urine sodium greater than 20 mEq/L in this setting, it means the kidneys are losing sodium rather than conserving it, pointing to a renal source of natriuresis. The most common medication class that causes this pattern is diuretics. Loop diuretics and thiazide diuretics promote Na loss in the nephron, which increases urine sodium and can contribute to volume depletion and dilutional hyponatremia when water intake continues. Hormonal or adrenal factors can also cause salt wasting, but among medication classes, diuretics are the classic culprit for this high urinary sodium in a hypovolemic patient.

References to the other options: ACE inhibitors can influence fluid and electrolytes but are not the typical driver of high urine sodium in this context. Mineralocorticoid deficiency causes salt wasting via lack of aldosterone but is not a medication class. The last option describes the physiologic situation rather than a drug class.

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