Umbilical cord prolapse — structured SAQ (15 marks)

(a) Assessment and immediate management, first two minutes (5 marks)

One mark per point with its reasoning, maximum five. [1][7]

• Immediate vaginal examination. A sustained bradycardia within minutes of membrane rupture is cord prolapse until an examination proves otherwise. In the one examination, confirm the cord and its pulsation, and assess dilatation, station and presentation — these decide the mode of birth.[1][7]
• Elevate the presenting part off the cord with the examining hand and keep it there. This relieves the mechanical compression that is causing the bradycardia and is the single most effective immediate action. The hand does not come out until the baby is delivered.[1][2]
• Declare the emergency and call by name and role — obstetric consultant, anaesthetist, theatre team, neonatal team — plus a scribe and a timekeeper, and record the time the bradycardia started.[4][7]
• Stop the oxytocin if running and stop maternal pushing. Contractions and expulsive effort both increase cord compression.[7]
• Position knee-to-chest. On objective transperineal ultrasound this gives the greatest elevation of the presenting part, reducing the parasagittal angle of progression from a median of 103.6 to 80.7 degrees. Minimise cord handling; do not attempt to replace it.[1][2]

A mark is available for naming the risk factors that made this predictable: grand multiparity, an unstable lie earlier in pregnancy, and a high presenting part at rupture. [5]

(b) Mode and urgency of birth, and the transfer (4 marks)

One mark each: the decision, the justification, the anaesthetic, and the transfer detail. [1][4]

• Category 1 caesarean. At 6 cm with the head at minus 3 station, vaginal birth is not achievable in a useful timeframe. The standard decision-to-delivery interval for a category 1 caesarean is 30 minutes; well-resourced units achieve a median of about 11 minutes.[1][4]
• Justify with the interval evidence. The clock that matters physiologically is the bradycardia-to-delivery interval: cord arterial pH falls about 0.009 units per minute, and the risk of a pH under 7 is 80% beyond 20 minutes of bradycardia versus 17.2% under 20 minutes. Manual elevation stops that clock before theatre is reached.[4]
• Anaesthesia. General anaesthesia if there is no working regional block and the fetus is compromised; a dense working epidural may be topped up if genuinely fast. State that the decision is made jointly and out loud with the anaesthetist.[7]
• The transfer. Keep the hand in place for the entire journey, with the woman in exaggerated Sims (left lateral, head down, wedge under the hip) on the trolley. Consider bladder filling if there is any delay. Handover to the anaesthetist and theatre team is structured, not narrated.[2][3]

(c) Bladder filling — technique and evidence (3 marks)

One mark for the technique, one for the safety step, one for an accurate statement of the evidence. [2][3][8]

• Technique: insert a Foley catheter, push the end of a blood giving set into it and run in warmed normal saline, then clamp the catheter once 500 to 750 mL have been instilled — the regimen RCOG Green-top 50 describes. The 500 mL volume is the one used in the published comparative series.[3][8]
• Safety step: empty the bladder before the abdomen is opened or before a vaginal birth. Forgetting this is the classic examined error.[7][8]
• The evidence: transperineal ultrasound confirms a real elevation effect — 500 mL was second only to the knee-chest position, and worked better when the head was already low. But in the only comparative series (44 women, 15 with bladder filling added to manual elevation) time to delivery and mean neonatal pH were unchanged. It is a transfer and staffing technique that frees the hand, not a proven improver of neonatal outcome where theatre is next door.[2][3]

(d) The rural birth centre, 55 minutes from theatre (3 marks)

One mark each for continuous elevation, bladder filling with retrieval activation, and a realistic honest assessment. [6][7]

• The hand stays in for the entire journey — not for the ambulance, not for the stairs, not for the paperwork. Someone else calls, someone else documents, someone else drives.[6]
• Fill the bladder before you move her. This is exactly the situation the technique exists for: it maintains elevation and frees the clinician during a prolonged transfer — which is why RCOG Green-top 50 recommends that community midwives carry a Foley catheter and fluid-infusion equipment. Add knee-chest or exaggerated Sims for the journey, activate the retrieval service, and pre-alert the receiving unit so theatre is open on arrival.[2][3]
• Consider acute tocolysis — RCOG Green-top 50 names terbutaline 0.25 mg (250 micrograms) subcutaneously — if uterine activity is worsening compression during transfer, and be honest in the handover about what a 55-minute interval means for a fetus with a sustained bradycardia. In the Dutch primary-care series, manual elevation was used in seven of eight cases and bladder filling in two; one baby died of severe asphyxia and the remainder recovered.[6][7]