What is the first-line uterotonic for postpartum hemorrhage due to uterine atony?

What is the first-line uterotonic for postpartum hemorrhage due to uterine atony?

• A. Oxytocin.
• B. Methylergonovine.
• C. Prostaglandin E2.
• D. Misoprostol.

Answer: (A)

In postpartum hemorrhage caused by uterine atony, the first-line uterotonic is oxytocin because it directly stimulates the uterine smooth muscle to contract, helping compress the bleeding vessels and rapidly reduce blood loss. Its onset is quick, it has a short half-life which allows for easy titration and quick cessation if needed, and it generally has a favorable safety profile compared with other uterotonics. This makes it the preferred initial therapy right after delivery, alongside uterine massage and measures to control bleeding. Other uterotonics are effective but come with more drawbacks. Methylergonovine is potent but raises blood pressure and is contraindicated in hypertension or preeclampsia. Prostaglandins can be effective but may cause bronchospasm, fever, or significant GI side effects. Misoprostol is useful when oxytocin isn’t available, but its effect is less predictable and it tends to cause more fever and GI symptoms. Hence, oxytocin is chosen first, with escalation to other agents if bleeding persists.

In postpartum hemorrhage caused by uterine atony, the first-line uterotonic is oxytocin because it directly stimulates the uterine smooth muscle to contract, helping compress the bleeding vessels and rapidly reduce blood loss. Its onset is quick, it has a short half-life which allows for easy titration and quick cessation if needed, and it generally has a favorable safety profile compared with other uterotonics. This makes it the preferred initial therapy right after delivery, alongside uterine massage and measures to control bleeding.

Other uterotonics are effective but come with more drawbacks. Methylergonovine is potent but raises blood pressure and is contraindicated in hypertension or preeclampsia. Prostaglandins can be effective but may cause bronchospasm, fever, or significant GI side effects. Misoprostol is useful when oxytocin isn’t available, but its effect is less predictable and it tends to cause more fever and GI symptoms. Hence, oxytocin is chosen first, with escalation to other agents if bleeding persists.