What drug and route should be used for active management of third stage of labour (AMTSL)?

RML Lucknow - 2021

Obstetrics & Gynaecology

Easy

Appeared in: RML Lucknow - 2021

Explanation

The World Health Organization (WHO) recommends Oxytocin as the first-line uterotonic agent for preventing postpartum hemorrhage (PPH) during the third stage of labor.
Intramuscular (IM) injection of 10 IU of Oxytocin is the standard, preferred route for routine active management of the third stage of labor (AMTSL).
The IM route is effective, easy to administer, and avoids the risk of severe hypotension associated with a rapid intravenous (IV) bolus of Oxytocin.
This intervention causes the uterus to contract strongly, facilitating placental separation and constricting blood vessels at the placental site, thereby minimizing blood loss.

Option A: While IV Oxytocin is effective, it is typically administered as a dilute infusion for PPH treatment or augmentation of labor, not as a first-line prophylactic route for routine AMTSL. A rapid IV bolus is avoided due to the significant risk of causing sudden, severe hypotension.
Option C: Oral Misoprostol is a second-line agent. It is less effective than Oxytocin and is associated with more side effects, such as fever, shivering, and diarrhea.
Option D: IV Methargine (methylergonovine) is not recommended for routine AMTSL prophylaxis because of its side effect profile. It is a potent vasoconstrictor and can cause a dangerous spike in blood pressure.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological management during the third stage of labor helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Postpartum Hemorrhage (PPH) is a major cause of maternal death worldwide. Correctly performing AMTSL, with IM Oxytocin as the cornerstone, is one of the most effective nursing interventions to prevent PPH.
A nurse must always check for the presence of a second twin before administering Oxytocin. Giving a uterotonic with an undelivered twin in the uterus can cause fetal compromise.
Nursing responsibility includes monitoring for uterine firmness (tone), vaginal bleeding, and vital signs after placental delivery to quickly identify and manage uterine atony.

How to Approach the Question

First, identify the core of the question: it asks for the standard, first-line drug and route for routine active management of the third stage of labor (AMTSL).
Recall the purpose of AMTSL: to prevent postpartum hemorrhage (PPH) by ensuring the uterus contracts effectively after delivery.
Evaluate the options based on standard obstetric protocols. The primary goal is effectiveness and safety.
Consider Oxytocin first, as it is the gold standard. The question then becomes about the route: IM vs. IV.
Analyze the safety profile of each route for routine prophylaxis. IM is simple and avoids the risk of hypotension associated with a rapid IV push. Therefore, IM Oxytocin is the most appropriate choice for routine use.
Evaluate the other drugs. Misoprostol is a backup, and Methargine is a second-line treatment agent with significant contraindications (hypertension), making them incorrect choices for routine first-line management.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 11-26