Obstetric early warning scores and escalation — structured oral station (12 minutes)

Opening prompt — "Tell me what you do at the bedside, in the first ten minutes."

Model response — say it in this order: [5][6]

• "This is a multi-parameter trigger with fever and tachypnoea — I am worried about evolving sepsis with possible genital tract or wound source. I would call my consultant now and put them on speaker."
• "Bedside ABCDE: 15-degree left lateral tilt, high-flow oxygen, two large-bore cannulae, balanced crystalloid, bloods including lactate and cultures, crossmatch, coagulation with fibrinogen."
• "Focused source hunt: examine the perineum and episiotomy, the uterus, the lochia, the chest, the urine; bedside ultrasound for free fluid or retained products."
• "SBAR handover to my consultant and to the anaesthetist: situation, background, assessment, recommendation — I want HDU transfer and the sepsis bundle activated."[5][6]

Examiner is listening for: parallel action, named role for the call, the SBAR sentence, and recognition that a multi-parameter trigger with fever is sepsis until proven otherwise. [5]

Probe 1 — "Walk me through the design of an obstetric early warning score."

• "There are two architectural families. Aggregate-weighted scoring (MEOWS) assigns points for each parameter's deviation from normal and sums them — a total above a threshold triggers. Single-parameter triggering (MEWT) uses one sustained abnormal value — no summation."[1][3]
• "The chart must use pregnancy-specific thresholds. A HR of 95, a BP of 95/55, a RR of 20 are normal late in pregnancy; the chart flags deviation from the pregnant baseline, not the non-pregnant baseline."[6]
• "The chart is only useful paired with an escalation pathway. A documented trigger that is not acted on is the commonest failure mode in maternal mortality enquiries."[5]

Probe 2 — "What is the evidence that MEOWS works?"

• "Singh 2012, in Anaesthesia, validated the CEMACH MEOWS in 676 consecutive obstetric admissions — 30% triggered, 13% had morbidity. Sensitivity 89%, specificity 79%, PPV 39%, NPV 98%. The strength is the high NPV; the weakness is the false-positive burden."[1]
• "Shields 2016 showed MEWT implementation reduced maternal morbidity. Hedriana 2016 showed two or more persistent triggers for 30 minutes carried OR 61.7 for ICU admission."[3][4]
• "Edwards 2015 validated modified obstetric scores against severe sepsis in chorioamnionitis. And the Cochrane review by Smith in 2021 is honest about the low certainty of the evidence base — the chart you embed and audit outperforms the chart you admire."[2]

Probe 3 — "Quote me the MEWT severe single-value triggers."

• "Maternal heart rate above 130, respiratory rate above 30, mean arterial pressure under 55, oxygen saturation under 90, altered mental status, or nurse concern."[3]
• "Each is sustained for more than 20 minutes. That persistence requirement filters the post-epidural or anxiety tachycardia from the real slope toward decompensation."[3][4]

Probe 4 — "The midwife wrote 'doesn't look right' in the margin. How do you handle that?"

This is a scored domain, not a courtesy. Demonstrate it out loud: [3]

• "Nurse concern is a legitimate trigger, not a courtesy — I treat that note as a sixth vital sign. I go to the bedside myself, I ask the midwife what she is worried about, and I take her concern into my assessment."
• "If the obs had been normal and the nurse concern alone was present, I would still escalate to a bedside review within 30 minutes and document my findings and a plan."
• "I would thank her at the bedside for raising the concern — it is the cultural change that makes the chart useful."[3][5]

Probe 5 — "After your interventions she is stable but the working diagnosis is sepsis from the episiotomy. Where does she go?"

• "HDU. She meets the criteria — persistent multi-parameter trigger, evolving sepsis, post-operative. I would transfer her with a documented safety-net, a named accepting clinician, and a clear plan for what to do if she deteriorates en route."[5]
• "Post-event: serial lactate, serial bloods, ongoing source control, daily VTE risk reassessment once sepsis is controlled, structured debrief with the woman and the team, and an incident and near-miss review reporting back into the unit's audit of obstetric EWS performance."[5]
• "Next pregnancy: counsel about recurrence of postpartum sepsis and a documented postnatal observation plan."[5]