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

Appeared in: RML 2023

Explanation

The World Health Organization (WHO) recommends Oxytocin 10 units via the intramuscular (IM) route as the first-line uterotonic agent for the active management of the third stage of labor (AMTSL).
This intervention is a critical component in the prevention of postpartum hemorrhage (PPH), a leading cause of maternal mortality.
The IM route is preferred for routine prophylaxis because it is effective and avoids the significant risk of hypotension associated with a rapid IV bolus of oxytocin.

Option A: A rapid IV bolus of oxytocin can cause profound and dangerous hypotension. Therefore, it is not the recommended route for routine AMTSL.
Option C: Misoprostol is considered a second-line agent because it is less effective than oxytocin and has a higher rate of side effects, including shivering and fever.
Option D: IV administration of Methergine (methylergonovine) can cause a sudden, severe increase in blood pressure and is generally avoided. The standard route is IM.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological intervention for the active management of the third stage of labor (AMTSL) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Correctly performing AMTSL, including administering the right drug via the right route, is a fundamental nursing skill that directly prevents PPH and saves lives.
Nurses must always verify for contraindications before administering uterotonics. A critical safety check is measuring the patient's blood pressure before even considering Methergine (methylergonovine).
A key nursing responsibility is to ensure that oxytocin is stored correctly (refrigerated) to maintain its potency. If the cold chain is broken, the nurse should advocate for using an alternative like misoprostol.

How to Approach the Question

First, identify the clinical task in the question, which is the 'active management of the third stage of labour (AMTSL)'.
Recall the primary goal of AMTSL: prevention of postpartum hemorrhage (PPH).
Access your knowledge of the standard, evidence-based protocol for AMTSL, specifically the recommended first-line uterotonic drug.
Evaluate the options provided. You should recognize that Oxytocin is the first-line drug.
Next, compare the two Oxytocin options based on the route of administration (IV vs. IM).
Recall the safety profiles of each route. A rapid IV bolus carries a risk of severe hypotension, making the IM route the safer and standard choice for routine prophylaxis. This identifies IM Oxytocin as the correct answer.

Concept Tested & Keywords

Concept Tested: Pharmacological intervention for the active management of the third stage of labor (AMTSL).
Stem keywords: drug, root, active management, third stage of labour, AMTSL
Lead-in keywords: What

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E6 Obstetrics Williams p. 10-26

Practise the full RML 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.