Which diuretic requires monitoring for signs of hypokalemia in clients treating mild hypertension?

The choice of hydrochlorothiazide is correct because this thiazide diuretic can lead to the loss of potassium in the urine, which may result in hypokalemia (low potassium levels in the blood). Thiazide diuretics function by inhibiting sodium reabsorption in the distal convoluted tubule of the nephron, which indirectly promotes potassium excretion. As potassium levels can drop significantly with the use of this medication, it is crucial to monitor patients for symptoms of hypokalemia, such as weakness, fatigue, and muscle cramps.

Other diuretics listed offer different properties or mechanisms of action. Amiloride and triamterene are potassium-sparing diuretics, which are actually designed to help retain potassium in the body rather than deplete it. Spironolactone, while also a potassium-sparing agent, works as an aldosterone antagonist and is beneficial in situations where potassium retention is desired. However, it can also require monitoring for hyperkalemia in certain contexts. In contrast, hydrochlorothiazide presents a specific risk for hypokalemia, making monitoring essential for patients being treated for hypertension with this diuretic.