The progestogen with the greatest haemostatic effect used in dysfunctional uterine bleeding (DUB) is :
First, I need to recall the core concept here. DUB is often caused by anovulation, leading to unopposed estrogen and endometrial hyperplasia. Progestogens are used to induce withdrawal bleeding and stabilize the endometrium. The key is which progestogen has the strongest effect in this context.
Now, the correct answer is likely Medroxyprogesterone acetate (MPA), which is a synthetic progestin. It's known for its high potency and long half-life. MPA works by stabilizing the endometrium and preventing excessive proliferation. It's commonly used in DUB management.
The other options might include other progestogens like norethisterone, levonorgestrel, or desogestrel. Let me think about their properties. Norethisterone is a first-generation progestin with less potency compared to MPA. Levonorgestrel is a third-generation progestin used in IUDs, but maybe its hemostatic effect isn't as strong as MPA. Desogestrel is another third-gen with high progestogenic activity but perhaps not as effective in DUB.
I need to verify why these are incorrect. For example, norethisterone is less potent and requires longer administration. Levonorgestrel's local effect via IUD is effective but maybe not the best for systemic DUB treatment. Desogestrel is used in COCs but not specifically highlighted for DUB's hemostasis.
Clinical pearl: Remember that MPA is the go-to for DUB due to its strong and long-lasting effects. Also, note that high-dose progestogens are used for acute cases, while lower doses for maintenance. Students might confuse different progestin types, so emphasizing MPA's role here is key.
**Core Concept**
Dysfunctional uterine bleeding (DUB) is managed with progestogens to induce endometrial withdrawal and stabilize the uterine lining. The hemostatic efficacy depends on the progestogenic activity, potency, and duration of action of the compound. Medroxyprogesterone acetate (MPA) is the most potent progestogen for this indication due to its high affinity for progesterone receptors and prolonged half-life.
**Why the Correct Answer is Right**
MPA is a synthetic first-generation progestogen with strong antiovulatory and endometrial-stabilizing effects. It works by downregulating estrogen receptors in the endometrium, inhibiting proliferation, and inducing secretory transformation. Its long half-life (18–24 hours) allows once-daily dosing, ensuring sustained suppression of anovulatory bleeding. High-dose MPA (10–15 mg/day) is the first-line treatment for acute DUB, as it rapidly achieves hemostasis.
**Why Each Wrong Option is Incorrect**
**Option A:** Norethisterone (a first-generation progestogen) has lower potency and requires prolonged administration (10–14 days) for hemostasis, making it less effective than MPA.
**Option