Prostaglandin that can be used to induce labour at term is
**Question:** Prostaglandin that can be used to induce labour at term is
A. PGE2
B. PGF2α
C. PGF1α
D. PTA
**Core Concept:**
Prostaglandins are a group of lipid substances that play a crucial role in various physiological processes, including uterine contractions. They are synthesized from arachidonic acid through the action of various enzymes, such as cyclooxygenase (COX). In the context of labor induction, prostaglandins are used to stimulate uterine contractions and initiate labor.
**Why the Correct Answer is Right:**
Prostaglandin F2α (PGF2α) is a potent uterotonic agent and can effectively induce uterine contractions, leading to labor initiation. It is a more selective agonist for the prostaglandin F receptor (FP) found on the myometrial smooth muscle cells. PGF2α is synthesized from arachidonic acid via the action of COX enzymes and is more effective than other prostaglandins in inducing labor.
**Why Each Wrong Option is Incorrect:**
A. Prostaglandin E2 (PGE2) is another potent prostaglandin but has a broader range of actions beyond uterine contraction, making it less specific for labor induction. PGE2 is synthesized through the action of COX enzymes, similar to PGF2α.
B. Prostaglandin F1α (PGF1α) is less potent than PGF2α and has a lower affinity for the FP receptor. It is also synthesized through the action of COX enzymes.
C. Prostaglandin Triterpene Acid (PTA) is not a recognized prostaglandin term or compound.
**Clinical Pearl:**
When considering prostaglandin-based labor induction, PGF2α is the preferred choice due to its higher selectivity for uterine contraction and narrower range of actions compared to PGE2. However, individual patient factors such as medical history, gestational age, and maternal condition must be taken into account before initiating labor induction with any prostaglandin.
For example, in cases of preterm labor or fetal distress, PGE2 might be preferred due to its broader range of actions. In contrast, PGF2α is typically used for post-term labor induction when the uterus is ripe and ready for contractions.