What is a common factor contributing to metabolic alkalosis in patients using diuretics?

• A. Fluid retention
• B. Electrolyte imbalance
• C. Excessive potassium loss
• D. Dehydration

Answer: (C)

Excessive potassium loss is a common factor contributing to metabolic alkalosis in patients using diuretics due to the way these medications function. Diuretics increase urine production, leading to increased excretion of electrolytes, including potassium. This loss of potassium can disrupt the balance of hydrogen ions in the body. When there is a significant depletion of potassium, the body may compensate by shifting hydrogen ions out of cells to maintain electrical neutrality, which can result in a higher pH level in the blood, characteristic of metabolic alkalosis.

In this context, while fluid retention, electrolyte imbalances, and dehydration can play roles in overall fluid and electrolyte management, they do not specifically lead to the characteristic changes associated with metabolic alkalosis like the loss of potassium does. Potassium plays a critical role in acid-base balance, and its deficit pushes the balance towards alkalinity, making it the most relevant factor in this scenario.