Labour, Delivery & Intrapartum Care
You are called urgently to the labour room by a second-year resident. A 29-year-old primigravida at 40 weeks is in the second stage, fully dilated for 90 minutes, pushing for 45 minutes, on a syntocinon infusion with an epidural. The cardiotocograph shows a baseline of 165 beats per minute, absent variability and recurrent late decelerations for the last 25 minutes. On examination the head is direct occipito-posterior at station plus one, with moderate caput and moulding, and the liquor is thickly meconium stained. The resident has already attempted a vacuum extraction with two pop-offs. How would you proceed?
What the panel is testing: Recognition of a pathological trace requiring delivery, sound judgement about instrument choice and station in a difficult second stage, and the ability to take over from a trainee safely and without humiliating them.
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Knowledge: This is a category three or pathological trace with absent variability and recurrent late decelerations in a woman on oxytocin, and the combination with thick meconium means I should assume significant fetal compromise and plan to deliver within minutes rather than continuing to observe.
Management: While preparing to deliver I would institute intrauterine resuscitation: stop the oxytocin, position her in the left lateral, give a fluid bolus if she is hypotensive, treat hypotension with a vasopressor with my anaesthetist, and consider acute tocolysis with terbutaline 250 micrograms subcutaneously if there is uterine hypertonus. I would call for the neonatal team, the anaesthetist and a second midwife, and inform theatre.
Ethics and communication: Taking over from the resident must be done in a way that is safe for the patient and preserves the trainee: I would step in decisively and explain to the woman who I am and what I am recommending, but I would avoid criticising the resident in front of her, and I would debrief privately afterwards to teach rather than blame.
Likely panel follow-up questions
- What are the prerequisites you check before any operative vaginal delivery?
- The head is impacted at caesarean. Describe exactly what you would do.
- The cord arterial pH comes back at 6.98 with a base deficit of 16. What happens next?
Pitfalls in this case
- Attempting a third instrument, or sequential forceps after failed vacuum, without acknowledging the added neonatal risk
- Failing to exclude abruption, rupture or maternal hypotension before attributing the trace to hypoxia alone
- Not stopping the oxytocin infusion
Reference: NICE NG229, Fetal Monitoring in Labour (2022); RCOG Green-top Guideline No. 26, Assisted Vaginal Birth (2020); ACOG Practice Bulletin No. 219, Operative Vaginal Birth (2020)