NORCET 2 - 2021 (shift-1)
Obstetrics & Gynaecology
Medium
Which one of the following methods of induction of labor should not be used in a patient with a previous lower segment caesarean section?
Appeared in: NORCET 2 - 2021 (shift-1)
Explanation
- Prostaglandin tablets containing misoprostol (a PGE₁ analogue) are absolutely contraindicated for labor induction in women with a prior cesarean delivery.
- Misoprostol is a potent uterotonic agent that significantly increases the risk of uterine tachysystole (excessive contractions).
- In a uterus with a scar from a previous cesarean section, this hyperstimulation can easily lead to uterine rupture, a life-threatening complication for both mother and fetus.
- Clinical trials and guidelines from major obstetric bodies, such as the American College of Obstetricians and Gynecologists, strongly advise against its use in this patient population.
Why Other Options Were Wrong
- Option A: Prostaglandin gel (dinoprostone, PGE₂) is also used with caution and often avoided due to an increased risk of uterine hyperstimulation, but the contraindication is not as absolute as it is for misoprostol tablets. Some studies show conflicting results on its safety.
- Option B: Stripping of the membranes is a mechanical, not pharmacological, method of induction. It is considered safe and is often a recommended first step for inducing labor in women attempting a vaginal birth after cesarean (VBAC).
- Option C: Oxytocin is commonly used for labor induction or augmentation in women with a prior LSCS. While it does increase the risk of uterine rupture compared to spontaneous labor, it is not contraindicated. Its use requires careful, slow titration and continuous electronic fetal monitoring.
Related Visual
- Visual 1: Table: Comparison of Labor Induction Methods in VBAC. This table would list the methods (Misoprostol, Dinoprostone, Oxytocin, Mechanical) and columns for 'Safety Profile,' 'Risk of Rupture,' and 'Clinical Recommendation' to visually summarize the information.
Clinical Relevance
- Nursing practice connection: Use the key finding related to Labor induction methods in patients with a previous cesarean section (TOLAC/VBAC) to guide bedside assessment, documentation, and the next nursing action.
- The absolute contraindication of misoprostol in TOLAC/VBAC is a critical patient safety principle. Using it can lead to uterine rupture, an obstetric emergency causing severe maternal hemorrhage, shock, need for emergency hysterectomy, and fetal distress or death.
- Nurses have a vital role in double-checking medication orders for labor induction, especially in patients with a prior cesarean. They must be vigilant in monitoring uterine activity and the fetal heart rate continuously when any induction agent is used.
- What if the patient had no prior uterine surgery? In that case, misoprostol (prostaglandin tablet) would be a valid and effective option for cervical ripening and labor induction, though still requiring careful monitoring for tachysystole.
How to Approach the Question
- First, identify the patient's key clinical history: a previous lower segment caesarean section (LSCS). This immediately brings to mind the primary risk associated with labor in this context: uterine rupture.
- The question asks which method 'should not be used,' meaning you need to identify the absolute contraindication among the options.
- Evaluate each option based on its mechanism and associated risk of uterine rupture.
- Recall or look up the safety profiles: Mechanical methods (like membrane stripping) are safest. Oxytocin is usable with caution. Prostaglandins carry a higher risk.
- Differentiate between the two types of prostaglandins. Prostaglandin tablets (misoprostol) are known to be much more potent and carry a significantly higher, unacceptable risk of uterine rupture compared to prostaglandin gel (dinoprostone).
- Conclude that the prostaglandin tablet (misoprostol) is the one method that is absolutely contraindicated.
Concept Tested & Keywords
- Concept Tested: Labor induction methods in patients with a previous cesarean section (TOLAC/VBAC).
- Stem keywords: induction of labor, previous lower segment caesarean section, LSCS
- Lead-in keywords: should not be used
- Clinical cues: Patient with a previous lower segment caesarean section, which indicates a scarred uterus.
- Negative lead-in flag: The question asks which method 'should not' be used, requiring identification of a contraindication.
Question ID
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Practise the full NORCET 2 - 2021 (shift-1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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