What is a first-line pharmacologic treatment for central diabetes insipidus?

What is a first-line pharmacologic treatment for central diabetes insipidus?

• A. Thiazide diuretic
• B. Intranasal desmopressin
• C. NSAIDs
• D. Oral rehydration solution

Answer: (B)

Central diabetes insipidus is caused by a deficiency of vasopressin, so the treatment that directly addresses the underlying problem is replacement with a synthetic ADH analog. Desmopressin works by binding to V2 receptors in the collecting ducts of the kidney, promoting insertion of aquaporin-2 channels, which increases water reabsorption. This reduces urine output and concentrates the urine, addressing the core symptom of CDI. Intranasal desmopressin is a common first-line route because it is practical and effective for rapid onset. Other formulations, such as oral or parenteral desmopressin, achieve the same effect. Other options don’t replace the missing hormone. A thiazide diuretic can be used in nephrogenic or partial DI to reduce urine output via different mechanisms, but it does not treat central DI directly. NSAIDs may help as adjuncts in some cases by diminishing prostaglandin-mediated diuresis, but they are not first-line. Oral rehydration solution helps maintain hydration but does not address the underlying hormone deficiency. Monitoring for hyponatremia is important when using desmopressin to avoid overcorrection of water balance.

Central diabetes insipidus is caused by a deficiency of vasopressin, so the treatment that directly addresses the underlying problem is replacement with a synthetic ADH analog. Desmopressin works by binding to V2 receptors in the collecting ducts of the kidney, promoting insertion of aquaporin-2 channels, which increases water reabsorption. This reduces urine output and concentrates the urine, addressing the core symptom of CDI.

Intranasal desmopressin is a common first-line route because it is practical and effective for rapid onset. Other formulations, such as oral or parenteral desmopressin, achieve the same effect.

Other options don’t replace the missing hormone. A thiazide diuretic can be used in nephrogenic or partial DI to reduce urine output via different mechanisms, but it does not treat central DI directly. NSAIDs may help as adjuncts in some cases by diminishing prostaglandin-mediated diuresis, but they are not first-line. Oral rehydration solution helps maintain hydration but does not address the underlying hormone deficiency. Monitoring for hyponatremia is important when using desmopressin to avoid overcorrection of water balance.