**Question:** Mechanism of criminal abortion: AIIMS 06

**Core Concept:**
The question is testing the understanding of the mechanism and pathophysiology of criminal abortion, which is an induced miscarriage or termination of pregnancy. Understanding the various methods and their mechanisms is crucial for healthcare professionals involved in obstetrics and gynaecology.

**Why the Correct Answer is Right:**

Correct Answer: **Option D: Inhibition of prostaglandin synthesis**

Prostaglandins are a group of lipid substances that play a crucial role in various physiological processes, including uterine contractions during labor and abortion. In criminal abortion, a medication or a combination of medications is used to inhibit the synthesis of prostaglandins, leading to relaxation of uterine muscles and prevention of uterine contractions. This results in the inability of the fetus to descend into the birth canal, leading to miscarriage.

**Why Each Wrong Option is Incorrect:**

A. **Inhibition of estrogen and progesterone synthesis:** Estrogen and progesterone are steroid hormones that play a vital role in maintaining pregnancy. Inhibition of their synthesis would not directly lead to criminal abortion but could indirectly affect the uterine contractions and fetal growth.

B. **Inhibition of uterine contractions:** While inhibiting uterine contractions is relevant to criminal abortion, this option does not explain the whole mechanism.

C. **Inhibition of cervical ripening:** Cervical ripening is a part of the process of labor and delivery. Inhibition of cervical ripening does not directly cause criminal abortion.

**Why Proper Answer is Right:**

Prostaglandins are synthesized in the uterus during the abortion process. Inhibition of prostaglandin synthesis results in the uterus not contracting, preventing the fetus from descending into the birth canal. This leads to the inability of the fetus to be delivered, causing miscarriage.

**Clinical Pearls:**

1. Inhibition of prostaglandin synthesis is the primary mechanism behind criminal abortion.
2. Understanding the physiological processes involved in pregnancy and labor is crucial for healthcare professionals to provide appropriate medical care.
3. Criminal abortion is a serious issue and should be addressed by medical professionals with utmost care and respect for patient autonomy and rights.