Which of the following conditions is associated with significant metabolic alkalosis after volume contraction due to loop diuretics?

• A. Heart failure
• B. Chronic kidney disease
• C. Hypertension
• D. Volume overload

Answer: (C)

Metabolic alkalosis following volume contraction is typically a result of several factors, including the effects of loop diuretics. These diuretics lead to excessive loss of sodium and water, which results in hypovolemia, and patients often compensate by retaining bicarbonate, leading to metabolic alkalosis.

In the context of hypertension, the use of loop diuretics is common to manage blood pressure while helping to prevent fluid overload in patients. When fluid volume decreases, as seen in patients treated with loop diuretics, the kidneys respond by enhancing bicarbonate reabsorption. This renal compensation to maintain blood pressure and fluid balance contributes significantly to alkalosis. The situation is compounded in hypertensive patients who are typically already at risk for alterations in electrolyte balance.

While heart failure, chronic kidney disease, and volume overload can also lead to diuretic-induced electrolyte and acid-base disturbances, they do not typically lead to significant metabolic alkalosis in the same way or to the same extent as in hypertensive patients. Heart failure can involve different compensatory mechanisms that may not lead to alkalosis, and chronic kidney disease alters the renal response to disturbances in volume status. Volume overload generally does not result in contraction and thus does not lead to alkalosis induced by volume