DOC in adrenal insufficiency –
**Core Concept**
Adrenal insufficiency is a condition where the adrenal glands fail to produce sufficient cortisol and/or aldosterone hormones. The emergency treatment involves administering glucocorticoids to replace the deficient hormones and maintain vital functions.
**Why the Correct Answer is Right**
The correct drug of choice (DOC) in adrenal insufficiency is hydrocortisone, which is a synthetic glucocorticoid that mimics the effects of cortisol in the body. Hydrocortisone is preferred over other glucocorticoids due to its ability to mimic the natural cortisol rhythm and its relatively short half-life, which allows for more precise control over hormone levels. This is crucial in adrenal insufficiency, where rapid and precise replacement of cortisol is essential to prevent life-threatening complications.
**Why Each Wrong Option is Incorrect**
**Option A:** Cortisol - While cortisol is the hormone that is deficient in adrenal insufficiency, administering cortisol itself is not the preferred treatment due to its long half-life and potential for causing hypercortisolism.
**Option B:** Fludrocortisone - Fludrocortisone is a synthetic mineralocorticoid that is used to replace aldosterone in adrenal insufficiency. However, it does not provide the same level of glucocorticoid activity as hydrocortisone, making it less suitable as a DOC in adrenal insufficiency.
**Option C:** Dexamethasone - Dexamethasone is a synthetic glucocorticoid with a long half-life, which makes it less suitable for acute replacement therapy in adrenal insufficiency.
**Clinical Pearl / High-Yield Fact**
In adrenal insufficiency, the DOC is hydrocortisone, which should be administered intravenously in a dose of 50-100 mg every 6-8 hours until oral replacement can be established.
**Correct Answer:** B. Fludrocortisone