Congenital adrenal hyperplasia (CAH) is associated with which of the following?
**Question:** Congenital adrenal hyperplasia (CAH) is associated with which of the following?
A. Defective enzyme activity in the adrenal cortex
B. Increased production of androgens due to adrenal hyperplasia
C. Impaired glucocorticoid synthesis
D. Increased cortisol production
**Core Concept:**
Congenital adrenal hyperplasia (CAH) is a group of inherited disorders characterized by a deficiency in the enzymes involved in the biosynthesis of cortisol and/or aldosterone in the adrenal cortex. The most common type is caused by a deficiency in the enzyme 21-hydroxylase, which leads to impaired cortisol and aldosterone production, and increased production of androgens.
**Why the Correct Answer is Right:**
CAH is associated with C (Impaired glucocorticoid synthesis) because it involves a deficiency in enzymes responsible for cortisol synthesis (e.g., 21-hydroxylase deficiency). As a result, the adrenal glands produce excessive amounts of cortisol, which leads to reduced production of other important hormones like aldosterone and cortisol. This imbalance causes adrenal hyperplasia and increased production of androgens.
**Why Each Wrong Option is Incorrect:**
A (Defective enzyme activity in the adrenal cortex) is incorrect because it does not address the specific enzyme deficiency in CAH. The correct answer (C) focuses on the impaired glucocorticoid synthesis.
B (Increased production of androgens due to adrenal hyperplasia) is incorrect as this describes a consequence of CAH, not the underlying cause. It is the result of the enzyme deficiency and hormonal imbalance.
D (Increased cortisol production) is incorrect because cortisol production is actually reduced due to the enzyme deficiency, not increased. Aldosterone and glucocorticoids are not addressed by this option.
**Clinical Pearl:**
Understanding the correct answer (C) helps students identify the underlying cause of adrenal hyperplasia and increased androgen production in CAH patients. This knowledge is essential for proper diagnosis and management of the condition.