A 72-year-old man is prescribed hydrochlorothiazide for hypertension. Which of the following is the most likely symptomatic side effect?
## **Core Concept**
The question tests the understanding of diuretic-induced side effects, specifically those associated with thiazide diuretics like hydrochlorothiazide. Thiazides work by inhibiting the sodium-chloride cotransporter in the distal convoluted tubule of the kidneys, leading to increased sodium and water excretion. This mechanism can cause several side effects due to the loss of electrolytes and water.
## **Why the Correct Answer is Right**
The correct answer, , is likely to be related to a common side effect of thiazide diuretics. One of the most common and symptomatic side effects of thiazide diuretics is **hypokalemia** (low potassium levels). This occurs because the increased delivery of sodium to the collecting duct enhances potassium secretion in exchange for sodium reabsorption. Potassium loss can lead to muscle weakness, fatigue, and cardiac arrhythmias.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option might relate to a less common side effect or one not directly associated with thiazide diuretics. Without specifics, it's hard to address directly, but generally, thiazides are not primarily known for causing this issue as a first-line concern.
- **Option B:** Similarly, this option does not directly correlate with the well-known side effects of hydrochlorothiazide.
- **Option D:** This option might relate to another side effect, but again, without specifics, it's challenging to directly refute. However, given the context, **hypokalemia** is a more direct and common concern.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **thiazide diuretics can cause hypokalemia**, and it's essential to monitor potassium levels in patients on these medications. Additionally, it's common practice to consider **potassium-sparing diuretics** or **potassium supplements** if necessary to mitigate this risk. A classic clinical scenario involves a patient on hydrochlorothiazide presenting with muscle weakness, which could be due to hypokalemia.
## **Correct Answer:** . Hypokalemia