Loop diuretics MOA and a major electrolyte effect?

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Study for the Pharmacology Drug Classifications Test with multiple choice questions and comprehensive explanations. Enhance your knowledge effectively and ace your exam!

Multiple Choice

Loop diuretics MOA and a major electrolyte effect?

Explanation:
Loop diuretics work by blocking the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle. This stops reabsorption of sodium, potassium, and chloride at that site, and because this segment is water-impermeable, water follows Na into the tubule as well. The increased delivery of sodium to the distal nephron drives more potassium secretion in the collecting duct, producing hypokalemia. While loop diuretics also raise the excretion of calcium and magnesium and can raise uric acid, the most notable electrolyte effect clinically is potassium loss.

Loop diuretics work by blocking the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle. This stops reabsorption of sodium, potassium, and chloride at that site, and because this segment is water-impermeable, water follows Na into the tubule as well. The increased delivery of sodium to the distal nephron drives more potassium secretion in the collecting duct, producing hypokalemia. While loop diuretics also raise the excretion of calcium and magnesium and can raise uric acid, the most notable electrolyte effect clinically is potassium loss.

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