Shoulder dystocia followed by a tight nuchal cord and a floppy infant
A 29-year-old G2P1 is in the second stage at 40+5 weeks. She had a spontaneous vaginal birth 4 years ago of a 3.4 kg infant. This pregnancy was induced for reduced fetal movements; her BMI is 36 and she developed gestational diabetes controlled on metformin, with a growth scan on the 90th centile. After 40 minutes of active pushing the head delivers but the shoulders do not; the midwife calls for help. Suprapubic pressure and a McRoberts manoeuvre are performed, the posterior arm is delivered, and a 4.4 kg boy is born at 12 minutes after the head. He is floppy, pale, with a tight nuchal cord that is clamped and cut, and has no respiratory effort at 60 seconds. The paediatric team is not yet in the room.
1. Describe your immediate neonatal and maternal management in the first minutes, and explain the physiological priorities.
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Neonatal priorities are airway, breathing and circulation, with thermal care and avoidance of hypothermia.
Neonatal steps:
- Start the newborn resuscitation algorithm: dry, stimulate, position, assess tone and breathing. With no respiratory effort and poor tone at 60 seconds, begin positive pressure ventilation with a well-fitting mask and a T-piece or self-inflating bag at the unit's standard settings; use air initially, adding oxygen if there is no response or the heart rate is low.
- Attach a pulse oximeter to the right hand and a three-lead ECG if available. If the heart rate is below 60 after effective ventilation, start chest compressions at a 3:1 ratio and secure the airway with a supraglottic device or intubation.
- Do not delay ventilation to check a cord gas. Anticipate anaemia or hypovolaemia from the tight cord and consider a fluid bolus if there is poor perfusion despite effective ventilation.
- Call for the neonatal team and document Apgar scores at 1, 5 and 10 minutes and the interventions given.
Maternal steps:
- Continue active management of the third stage; assess for postpartum haemorrhage, genital tract trauma and retained placenta.
- Perform a careful perineal and rectal examination for third- or fourth-degree tear and a vaginal/ cervical examination for lacerations.
- Document the shoulder dystocia: time of head-to-body, manoeuvres used and in what order, personnel present, and cord gases if taken.
2. The baby is admitted to the special care unit. The parents ask what caused this and whether it will happen again. How do you counsel them?
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Explain that shoulder dystocia is the impaction of the anterior shoulder behind the symphysis after the head delivers, and that it is a mechanical problem, not a failure by the mother. It occurs in about 0.6% of vaginal births and is more common with macrosomia, maternal diabetes, obesity and induced labour, all of which were present here.
Recurrence:
- Quoted recurrence risks are around 10-15% after a previous shoulder dystocia, higher if the next baby is larger or if diabetes is poorly controlled. It is not inevitable.
- Most babies are born without permanent injury; brachial plexus injury occurs in a minority and most resolve, but a small proportion have persistent deficit.
- The tight nuchal cord is common and not usually the cause of the shoulder dystocia, though it may have contributed to the baby's condition at birth.
Future pregnancy:
- Optimise glycaemic control before conception and in early pregnancy; tight control reduces macrosomia.
- Discuss that induction for suspected macrosomia does not reliably prevent shoulder dystocia and may increase caesarean rates.
- Plan a documented antenatal discussion about mode of birth; a caesarean may be offered if estimated fetal weight is high or diabetes is poorly controlled, but the decision is individual.
- Ensure the birth is in a unit with senior staff and a rehearsed shoulder dystocia drill, and that the plan is in the notes.
3. Six weeks later she asks whether the diabetes and the birth mean she should be induced earlier next time. What is your evidence-based answer?
Read the worked answer
Address two separate questions: glycaemic management and timing of birth.
Glycaemia:
- Gestational diabetes confers a high lifetime risk of type 2 diabetes (roughly 30-50% within 10 years). Arrange a 75 g oral glucose tolerance test at 6-12 weeks postpartum and annually thereafter, and give lifestyle advice.
- In a future pregnancy, screen early (first trimester) and aim for tight control; metformin may be continued but insulin is needed if targets are not met.
Timing of birth:
- For gestational diabetes managed on medication, induction or planned caesarean is commonly offered between 38 and 39 weeks because the risk of stillbirth and macrosomia rises after that, but the evidence for earlier induction in well-controlled diet-managed disease is weaker.
- Induction for suspected macrosomia alone reduces shoulder dystocia only modestly and increases caesarean and instrumental birth; it is not a guaranteed prevention.
- A previous shoulder dystocia is an indication for an individualised discussion, not automatic early induction.
Conclusion: plan an early booking visit, serial growth assessment, a documented mode-of-birth discussion, and delivery in a unit with appropriate senior cover. Refer to the diabetes in pregnancy service and give written information.