Successful regimen for medical termination of pregnancy in the first trimester is –
**Core Concept**
The medical termination of pregnancy in the first trimester involves the use of medications that induce uterine contractions and cervical dilation to expel the embryo or fetus. This process requires careful selection of medications to minimize complications and ensure a safe outcome for the patient.
**Why the Correct Answer is Right**
Mifepristone, when used in combination with misoprostol, is a widely accepted and effective regimen for medical termination of pregnancy in the first trimester. Mifepristone is a progesterone receptor antagonist that blocks the action of progesterone, which is essential for maintaining pregnancy. This leads to a decrease in uterine contractions and cervical dilation, making it easier to expel the embryo or fetus. Misoprostol, a prostaglandin E1 analog, further enhances uterine contractions and cervical dilation, facilitating the expulsion of the embryo or fetus.
**Why Each Wrong Option is Incorrect**
**Option A:** Methotrexate is a folic acid antagonist that is used for medical termination of pregnancy, but it is not typically used in combination with misoprostol and is less effective in the first trimester.
**Option B:** Prostaglandins can cause uterine contractions and are used in obstetric procedures, but using them alone is not a standard regimen for medical termination of pregnancy in the first trimester.
**Option C:** Ergot alkaloids like methylergometrine are used to induce uterine contractions, but they are not commonly used for medical termination of pregnancy due to their potential for causing severe uterine hypertonus.
**Clinical Pearl / High-Yield Fact**
It's essential to note that medical termination of pregnancy should only be performed under the guidance of a healthcare provider, and patients should be thoroughly counseled on the risks and benefits of the procedure. Additionally, a follow-up ultrasound is crucial to confirm the expulsion of the embryo or fetus.
**Correct Answer:** C. Mifepristone and misoprostol.