Contraindications for medical method (mifepristone + misoprostol) of first trimester MTP-
**Core Concept**
Mifepristone + misoprostol, also known as medical abortion, is a combination of medications used to induce termination of pregnancy during the first trimester. This method works by blocking the action of progesterone (mifepristone) and inducing uterine contractions (misoprostol), leading to expulsion of the embryo and products of conception.
**Why the Correct Answer is Right**
Mifepristone, a progesterone receptor antagonist, binds to the progesterone receptor in the implantation site, preventing the embryo from implanting in the uterine lining. Misoprostol, a prostaglandin E1 analogue, causes uterine contractions, softening the cervix, and dilating the cervix, facilitating the expulsion of the embryo and products of conception. The combination of these two medications is highly effective in terminating early pregnancies.
**Why Each Wrong Option is Incorrect**
**Option A:** **Chronic adrenal insufficiency** is a potential contraindication for mifepristone, as it can worsen adrenal insufficiency by blocking the action of cortisol and aldosterone. However, this option is not directly related to the mechanism of action of mifepristone + misoprostol.
**Option B:** **Cardiovascular disease** is not a direct contraindication for medical abortion, although certain cardiovascular conditions may increase the risk of complications. This option is too broad and not specific enough to be a correct contraindication.
**Option C:** **Cervical stenosis** is a contraindication for medical abortion, as the procedure requires dilation of the cervix to facilitate the expulsion of the embryo and products of conception. Misoprostol can cause cervical dilation, but in cases of cervical stenosis, this may not be sufficient, and surgical intervention may be required.
**Option D:** **Hypertension** is not a direct contraindication for medical abortion, although certain medical conditions may increase the risk of complications. This option is too broad and not specific enough to be a correct contraindication.
**Clinical Pearl / High-Yield Fact**
Mifepristone + misoprostol is highly effective in terminating early pregnancies, but it is essential to rule out ectopic pregnancies and to ensure that the patient has no contraindications to the procedure. The patient should also be counseled on the potential side effects and complications of the procedure.
**Correct Answer: C. Cervical stenosis**