Which statement about thiazide diuretics and potassium is accurate?

Which statement about thiazide diuretics and potassium is accurate?

• A. They cause hyperkalemia
• B. They cause potassium retention
• C. They cause potassium loss leading to hypokalemia
• D. They do not affect potassium

Answer: (C)

Thiazide diuretics cause potassium loss leading to hypokalemia. They block NaCl reabsorption in the distal convoluted tubule, so more sodium reaches the collecting ducts. There, sodium reabsorption via ENaC is linked to potassium secretion into the tubular lumen, a process amplified by aldosterone. This increased distal sodium delivery and aldosterone activity drive more potassium into the urine, lowering serum potassium. So the statement about potassium loss and hypokalemia is the accurate one. They do not cause potassium retention or hyperkalemia, and they do affect potassium by promoting its excretion. In clinical practice, monitor potassium levels and consider strategies to prevent or treat hypokalemia if needed.

Thiazide diuretics cause potassium loss leading to hypokalemia. They block NaCl reabsorption in the distal convoluted tubule, so more sodium reaches the collecting ducts. There, sodium reabsorption via ENaC is linked to potassium secretion into the tubular lumen, a process amplified by aldosterone. This increased distal sodium delivery and aldosterone activity drive more potassium into the urine, lowering serum potassium. So the statement about potassium loss and hypokalemia is the accurate one. They do not cause potassium retention or hyperkalemia, and they do affect potassium by promoting its excretion. In clinical practice, monitor potassium levels and consider strategies to prevent or treat hypokalemia if needed.