True regarding acetazolamide is ?
**Core Concept**
Acetazolamide is a carbonic anhydrase inhibitor that acts by inhibiting the enzyme carbonic anhydrase, which plays a crucial role in the bicarbonate buffering system in the body. By inhibiting this enzyme, acetazolamide reduces the reabsorption of bicarbonate in the proximal convoluted tubule, thereby increasing the excretion of bicarbonate and sodium ions in the urine.
**Why the Correct Answer is Right**
The correct answer is related to the mechanism of action of acetazolamide. When carbonic anhydrase is inhibited, the conversion of carbon dioxide to bicarbonate is impaired, leading to a decrease in the pH of the tubular fluid. This decrease in pH stimulates the secretion of hydrogen ions into the tubular fluid, which in turn increases the excretion of sodium and potassium ions. Additionally, acetazolamide's effect on carbonic anhydrase also leads to the inhibition of lactate production in the retina, making it useful in the treatment of glaucoma.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because acetazolamide's primary mechanism of action is not through the inhibition of aldosterone.
**Option B:** This option is incorrect because acetazolamide's main effect is not on the sympathetic nervous system.
**Option C:** This option is incorrect because acetazolamide does not primarily act by inhibiting the reabsorption of glucose in the proximal convoluted tubule.
**Clinical Pearl / High-Yield Fact**
Acetazolamide is also used in the treatment of epilepsy, particularly for the management of acute angle-closure glaucoma, and in the prophylaxis of high-altitude sickness.
**Correct Answer:** D