Which of the following is a potential cause of hypokalemia?

Which of the following is a potential cause of hypokalemia?

• A. Loop diuretics use
• B. Excess potassium intake
• C. Kidney failure with oliguria
• D. Adrenal insufficiency causing hyperkalemia

Answer: (A)

Potassium balance is kept by the kidneys and by hormonal control. Hypokalemia happens when potassium is lost in the urine or shifted into cells. Loop diuretics lower potassium by blocking the Na-K-2Cl transporter in the thick ascending limb of the loop of Henle. This disrupts reabsorption, increases sodium delivery to the distal tubule, and enhances potassium secretion into the urine, leading to lower potassium levels in the blood. The other scenarios would either raise potassium (excess intake) or reduce the kidneys' ability to excrete potassium (kidney failure with oliguria) or reduce potassium secretion due to low aldosterone (adrenal insufficiency), which tends to cause hyperkalemia rather than hypokalemia. So loop diuretic use is a potential cause of hypokalemia.

Potassium balance is kept by the kidneys and by hormonal control. Hypokalemia happens when potassium is lost in the urine or shifted into cells. Loop diuretics lower potassium by blocking the Na-K-2Cl transporter in the thick ascending limb of the loop of Henle. This disrupts reabsorption, increases sodium delivery to the distal tubule, and enhances potassium secretion into the urine, leading to lower potassium levels in the blood. The other scenarios would either raise potassium (excess intake) or reduce the kidneys' ability to excrete potassium (kidney failure with oliguria) or reduce potassium secretion due to low aldosterone (adrenal insufficiency), which tends to cause hyperkalemia rather than hypokalemia. So loop diuretic use is a potential cause of hypokalemia.