Which of the following is TRUE of adrenal suppression due to steroid therapy ?
**Core Concept**
Adrenal suppression due to steroid therapy refers to the reduction in the body's natural production of cortisol and aldosterone, which can occur when exogenous steroid hormones are administered for a prolonged period. This phenomenon is a result of negative feedback inhibition on the hypothalamic-pituitary-adrenal (HPA) axis, leading to decreased secretion of adrenocorticotropic hormone (ACTH) and subsequent reduction in cortisol and aldosterone production by the adrenal glands.
**Why the Correct Answer is Right**
When steroid therapy is initiated, it binds to glucocorticoid receptors in the hypothalamus and pituitary gland, leading to a decrease in the release of corticotropin-releasing hormone (CRH) and ACTH. This decrease in ACTH results in a reduction in the secretion of cortisol and aldosterone by the adrenal glands. The adrenal glands are then unable to produce sufficient amounts of these hormones, leading to adrenal suppression. This phenomenon is more pronounced with long-term use of high-dose steroids.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a statement about the treatment of adrenal insufficiency, not adrenal suppression due to steroid therapy.
**Option B:** This option is incorrect because it is a statement about the effects of dexamethasone on the HPA axis, but it does not specifically address adrenal suppression due to steroid therapy.
**Option C:** This option is incorrect because it is a statement about the symptoms of adrenal insufficiency, not adrenal suppression due to steroid therapy.
**Clinical Pearl / High-Yield Fact**
It's essential to note that patients on long-term steroid therapy should be tapered off the medication gradually to allow the HPA axis to recover, as abrupt cessation of steroids can lead to adrenal crisis.
**Correct Answer: D.**