Situation: The nurse works in the labor, operating, and postpartum units of a government hospital. A 32-year-old multipara with preeclampsia and moderate persistent asthma gave birth vaginally 40 minutes ago. Bleeding continues despite fundal massage and an oxytocin infusion. The uterus is soft, the bladder is empty, no lacerations are found, and quantified blood loss is 900 mL. Which additional medication is MOST appropriate to prepare?

Methylergonovine is contraindicated in hypertension and preeclampsia because it can cause severe hypertension and stroke, and carboprost is contraindicated in asthma because it causes bronchospasm. Tranexamic acid 1 g intravenously over 10 minutes, given within 3 hours of birth, is part of the first response to postpartum hemorrhage and is safe for her. She is 40 minutes after birth, well within that window.

Clinical situation
A multiparous patient with preeclampsia and moderate persistent asthma is 40 minutes postpartum after vaginal delivery. Uterine atony is suspected because the uterus remains soft despite fundal massage and an ongoing oxytocin infusion, the bladder is empty, and no lacerations are identified. Quantified blood loss is 900 mL, which meets the threshold for postpartum hemorrhage. The question asks which additional medication is most appropriate to prepare.

Why the other uterotonics are unsafe here
The two classic second-line uterotonics are both contraindicated in this patient. Methylergonovine causes vasoconstriction and can precipitate dangerous hypertension; in a patient with preeclampsia, this raises the risk of hypertensive crisis and stroke. Carboprost, a prostaglandin F2-alpha analogue, can induce bronchospasm and is therefore contraindicated in asthma. Oxytocin is already infusing, and giving 10 units undiluted by rapid IV push is never appropriate because it can cause severe hypotension, arrhythmia, and cardiovascular collapse.

Why tranexamic acid is the correct choice
Tranexamic acid is an antifibrinolytic agent that inhibits plasminogen activation and stabilizes clot formation, making it a safe adjunct when uterine atony is the suspected cause of ongoing bleeding. It does not cause hypertension or bronchospasm, so it is compatible with both preeclampsia and asthma. The recommended dose for postpartum hemorrhage is 1 g intravenously over 10 minutes, and it should be given as early as possible, ideally within 3 hours of birth. This patient is only 40 minutes postpartum, well within the therapeutic window.

Evidence supporting early tranexamic acid use
A systematic review and individual patient data meta-analysis of randomized trials found that tranexamic acid is a recommended treatment for women with a clinical diagnosis of postpartum hemorrhage, and early administration is emphasized ^[1]. A multinational systematic review of six placebo-controlled trials involving 54,934 participants observed that tranexamic acid lowered the risk of bleeding-related mortality and reduced further blood loss when used in postpartum hemorrhage management ^[4]. Although some trials focused on prophylactic use after vaginal delivery or before cesarean incision, the consistent finding is that tranexamic acid reduces blood loss by inhibiting fibrinolysis without the hemodynamic or respiratory risks seen with ergot alkaloids and prostaglandins .

Key distinctions for the licensure exam

Medication	Mechanism	Contraindication in this patient	Nursing implication
Methylergonovine	Uterine vasoconstriction and sustained contraction	Preeclampsia (risk of severe hypertension and stroke)	Check blood pressure before administration; avoid in hypertensive disorders
Carboprost	Prostaglandin F2-alpha analogue causing strong uterine contraction	Asthma (risk of bronchospasm)	Assess respiratory status; have bronchodilator available if used in other patients
Tranexamic acid	Antifibrinolytic; inhibits plasminogen activation	No contraindication with preeclampsia or asthma	Give 1 g IV over 10 minutes within 3 hours of birth
Oxytocin IV push	Uterotonic via oxytocin receptor stimulation	Rapid undiluted push causes hypotension and arrhythmia	Never administer undiluted oxytocin by rapid IV push

Watch out! Uterine atony is the most common cause of postpartum hemorrhage, but the choice of additional medication must account for maternal comorbidities. A soft uterus after oxytocin and fundal massage points to atony, yet the patient’s preeclampsia and asthma rule out the usual second-line uterotonics. Tranexamic acid is the safest and most evidence-supported adjunct in this scenario because it targets fibrinolysis rather than vascular or bronchial smooth muscle.

Key point! The 3-hour window for tranexamic acid is critical. Giving it after 3 hours is less effective and not recommended for postpartum hemorrhage. This patient at 40 minutes postpartum is an ideal candidate for early administration.