100 mg hydrocoisone is equivalent to ?
**Core Concept**
The question is testing the understanding of the glucocorticoid potency of hydrocortisone, a common corticosteroid used in various medical conditions. Glucocorticoids are a class of steroid hormones that play a crucial role in regulating inflammation, immune responses, and metabolism.
**Why the Correct Answer is Right**
Hydrocortisone is a moderate-potency glucocorticoid, and its potency is often compared to other corticosteroids in terms of their anti-inflammatory effects. A dose of 100 mg hydrocortisone is equivalent to 20 mg prednisolone, a more potent glucocorticoid. This equivalence is based on their relative glucocorticoid potencies, which are often expressed in terms of their ability to suppress the hypothalamic-pituitary-adrenal (HPA) axis. Hydrocortisone's potency is approximately 4 times that of cortisol, the body's natural glucocorticoid.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the glucocorticoid potency of hydrocortisone. The correct equivalence is not 40 mg prednisone, but rather 20 mg prednisolone.
**Option B:** This option is incorrect because it overestimates the glucocorticoid potency of hydrocortisone. The correct equivalence is not 80 mg prednisone, but rather 20 mg prednisolone.
**Option C:** This option is incorrect because it is not a valid comparison. The glucocorticoid potency of hydrocortisone is not directly equivalent to 16 mg dexamethasone, a potent synthetic glucocorticoid.
**Option D:** This option is incorrect because it underestimates the glucocorticoid potency of hydrocortisone. The correct equivalence is not 10 mg prednisolone, but rather 20 mg prednisolone.
**Clinical Pearl / High-Yield Fact**
When converting between different glucocorticoids, it is essential to consider their relative potencies and to use a conversion factor that takes into account their anti-inflammatory effects. A commonly used conversion factor is that 100 mg hydrocortisone is equivalent to 20 mg prednisolone.
**Correct Answer: D. 10 mg prednisolone.**