Which commonly used uterotonic is safe to use in an asthmatic with severe preeclampsia to treat uterine atony?

Which commonly used uterotonic is safe to use in an asthmatic with severe preeclampsia to treat uterine atony?

• A. Oxytocin
• B. 15-methyl prostaglandin F2a
• C. Ergonovine
• D. 15-methyl PGF2a only

Answer: (A)

The key is choosing a uterotonic that both effectively treats uterine atony and minimizes risks given asthma and severe preeclampsia. Oxytocin fits this well because it directly stimulates the uterine muscle to contract without provoking bronchoconstriction or severe vasoconstriction. It is the standard first-line agent for uterine atony and is considered safe in patients with asthma and in the context of severe preeclampsia when used at appropriate IV infusion doses. In contrast, prostaglandin F2α analogs (such as carboprost) are potent uterotonics but can cause bronchoconstriction, making them problematic for asthmatics. They also can raise blood pressure or worsen vasospasm, which is undesirable in severe preeclampsia. Ergonovine is a powerful vasoconstrictor and can significantly elevate blood pressure and risk cerebral or coronary vasospasm, which is contraindicated in preeclampsia. Therefore, these options are avoided in this clinical scenario.

The key is choosing a uterotonic that both effectively treats uterine atony and minimizes risks given asthma and severe preeclampsia. Oxytocin fits this well because it directly stimulates the uterine muscle to contract without provoking bronchoconstriction or severe vasoconstriction. It is the standard first-line agent for uterine atony and is considered safe in patients with asthma and in the context of severe preeclampsia when used at appropriate IV infusion doses.

In contrast, prostaglandin F2α analogs (such as carboprost) are potent uterotonics but can cause bronchoconstriction, making them problematic for asthmatics. They also can raise blood pressure or worsen vasospasm, which is undesirable in severe preeclampsia. Ergonovine is a powerful vasoconstrictor and can significantly elevate blood pressure and risk cerebral or coronary vasospasm, which is contraindicated in preeclampsia. Therefore, these options are avoided in this clinical scenario.