Which of these medications is used for the prevention of postpartum hemorrhage (PPH)?

NHM UP Staff Nurse-2023 Shift-2nd

Obstetrics & Gynaecology

Easy

Appeared in: NHM UP Staff Nurse-2023 Shift-2nd

Explanation

Oxytocin is the first-line uterotonic drug recommended for the prevention of postpartum hemorrhage (PPH).
Its primary mechanism of action is to stimulate the smooth muscle of the uterus, causing it to contract powerfully after delivery.
These contractions compress the blood vessels at the placental implantation site, which is essential for controlling bleeding and preventing uterine atony, the most common cause of PPH.

Option A: Magnesium sulfate is a tocolytic, meaning it relaxes the uterine muscle. This action is the opposite of what is needed to prevent PPH and would increase the risk of hemorrhage.
Option B: Calcium carbonate is an antacid and a dietary supplement used to treat low calcium levels or indigestion. It has no effect on uterine contractility.
Option D: Heparin is an anticoagulant (blood thinner). Administering it would impair blood clotting and dramatically increase bleeding, making it dangerous and contraindicated in a patient at risk for hemorrhage.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological management for the prevention of postpartum hemorrhage (PPH) as background academic context rather than a clinical decision trigger.
Active management of the third stage of labor (AMTSL), which includes the prophylactic administration of a uterotonic like oxytocin, is a critical, evidence-based nursing intervention that significantly reduces the incidence of PPH, a leading cause of maternal mortality worldwide.
Nurses must be vigilant about the contraindications for different uterotonics. For example, while oxytocin is first-line, methylergonovine (another uterotonic) is contraindicated in hypertensive patients due to its vasoconstrictive effects.
A critical safety check for nurses is to differentiate between look-alike, sound-alike drugs. Confusing a tocolytic like magnesium sulfate with a uterotonic like oxytocin can have fatal consequences.

How to Approach the Question

First, identify the key clinical problem: the prevention of postpartum hemorrhage (PPH).
Recall the primary cause of PPH, which is uterine atony (the failure of the uterus to contract after birth).
Therefore, the correct medication must be one that causes uterine contraction (a uterotonic).
Evaluate each option based on its pharmacological action: Oxytocin stimulates uterine contractions. Magnesium sulfate relaxes the uterus. Calcium carbonate is an antacid. Heparin is an anticoagulant.
Select the drug that promotes uterine contraction (Oxytocin).
Eliminate the drugs that would either worsen the condition (Magnesium sulfate, Heparin) or have no relevant effect (Calcium carbonate).

Concept Tested & Keywords

Concept Tested: Pharmacological management for the prevention of postpartum hemorrhage (PPH).
Stem keywords: medication, prevention, postpartum hemorrhage, PPH
Lead-in keywords: Which
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false