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O&G TopicsIntrapartum care — birth after caesarean

O&G · Intrapartum care — birth after caesarean

Birth after caesarean: VBAC and elective repeat caesarean

Also known as VBAC · Vaginal birth after caesarean · TOLAC · Trial of labour after caesarean · Elective repeat caesarean · ERC · Birth after previous caesarean

Exam-exhaustive FRANZCOG fellowship reference on birth after caesarean — absolute and relative contraindications, quantified success predictors and the VBAC calculator, uterine rupture risk with the actual numbers and their sources, intrapartum monitoring requirements, induction and augmentation after caesarean, and the shared decision-making conversation. Anchored to RANZCOG C-Obs 38 (2025), globally tagged to RCOG Green-top 45, ACOG Practice Bulletin 205, MRCOG and ABOG.

high20 referencesUpdated 26 July 202616 min readVerification in progress

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Practise this topic9 MCQs with explanations

Target exams

FRANZCOGMRCOGABOGFRCSCMRCPI

Red flags

  • An abnormal fetal heart rate in a labouring woman with a scar is uterine rupture until proven otherwise — it is the commonest and often the only early sign
  • Scar pain persisting between contractions, especially through a working epidural
  • Loss of station — the presenting part that was at plus 1 is now high
  • Prostaglandin induction of a scarred uterus multiplies rupture risk roughly fifteenfold versus repeat caesarean without labour
  • Planned VBAC in a unit that cannot deliver an immediate caesarean and transfuse
  • A classical or inverted-T scar — labour is not an option, whatever she wants
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Practise this topic9 MCQs with explanations

Target exams

FRANZCOGMRCOGABOGFRCSCMRCPI

Red flags

  • An abnormal fetal heart rate in a labouring woman with a scar is uterine rupture until proven otherwise — it is the commonest and often the only early sign
  • Scar pain persisting between contractions, especially through a working epidural
  • Loss of station — the presenting part that was at plus 1 is now high
  • Prostaglandin induction of a scarred uterus multiplies rupture risk roughly fifteenfold versus repeat caesarean without labour
  • Planned VBAC in a unit that cannot deliver an immediate caesarean and transfuse
  • A classical or inverted-T scar — labour is not an option, whatever she wants
One-line fellowship answer

For a woman with one previous lower segment caesarean and no contraindication, planned VBAC succeeds in about three in four and carries a scar rupture risk of roughly 1 in 200; elective repeat caesarean removes almost all of that intrapartum risk but adds to a rising curve of praevia, accreta and hysterectomy in every pregnancy that follows — so the job is not to pick a side, it is to give her both sets of numbers and to make whichever plan she chooses genuinely safe.[1][7][13]

She is 31, one caesarean at full dilatation three years ago for failure to progress, now 34 weeks and asking the question every antenatal clinic hears: "Can I have a normal birth this time?" You have twelve minutes. The examiner is not testing whether you know the answer — there isn't one — but whether you can hand her real numbers, hear what matters to her, and write a plan that holds up at 3 am when she arrives contracting.[1][7]

Overview and definition

Get the words right, because examiners listen for them. Planned VBAC and trial of labour after caesarean describe the intention; successful VBAC describes the outcome; elective repeat caesarean is the planned alternative. A woman who plans VBAC and ends up with an intrapartum caesarean has not "failed" — she has had a planned VBAC with a caesarean outcome, and her risk profile sits between the two groups.[1][11]

The second distinction is surgical. Complete rupture breaches the full thickness of the uterine wall including the visceral peritoneum, with fetal parts or membranes escaping into the abdomen; dehiscence is a scar window with intact peritoneum, usually asymptomatic and often found incidentally at repeat caesarean. Only the first is catastrophe whole topic is built around.[12][19]

Why this is a Tier 1 exam topicAround one in three or four births in ANZ is a caesarean, so a very large cohort of women arrive in the next pregnancy needing this conversation. It is a counselling station, an intrapartum emergency station and an SAQ all at once.[13][20]
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References20ShowHide
  1. [1]Landon MB, Hauth JC, Leveno KJ, et al. Maternal and perinatal outcomes associated with a trial of labor after prior cesarean delivery N Engl J Med, 2004.PMID 15598960
  2. [2]Grobman WA, Lai Y, Landon MB, et al. Development of a nomogram for prediction of vaginal birth after cesarean delivery Obstet Gynecol, 2007.PMID 17400840
  3. [3]Grobman WA, Sandoval G, Rice MM, et al. Prediction of vaginal birth after cesarean delivery in term gestations: a calculator without race and ethnicity Am J Obstet Gynecol, 2021.PMID 34043983
  4. [4]Guise JM, McDonagh MS, Osterweil P, et al. Systematic review of the incidence and consequences of uterine rupture in women with previous caesarean section BMJ, 2004.PMID 15231616
  5. [5]Fitzpatrick KE, Kurinczuk JJ, Alfirevic Z, et al. Uterine rupture by intended mode of delivery in the UK: a national case-control study PLoS Med, 2012.PMID 22427745
  6. [6]Lydon-Rochelle M, Holt VL, Easterling TR, et al. Risk of uterine rupture during labor among women with a prior cesarean delivery N Engl J Med, 2001.PMID 11439945
  7. [7]Crowther CA, Dodd JM, Hiller JE, et al. Planned vaginal birth or elective repeat caesarean: patient preference restricted cohort with nested randomised trial PLoS Med, 2012.PMID 22427749
  8. [8]Dodd JM, Crowther CA, Huertas E, et al. Planned elective repeat caesarean section versus planned vaginal birth for women with a previous caesarean birth Cochrane Database Syst Rev, 2013.PMID 24323886
  9. [9]Dodd JM, Crowther CA, Grivell RM, et al. Elective repeat caesarean section versus induction of labour for women with a previous caesarean birth Cochrane Database Syst Rev, 2017.PMID 28744896
  10. [10]Tita AT, Landon MB, Spong CY, et al. Timing of elective repeat cesarean delivery at term and neonatal outcomes N Engl J Med, 2009.PMID 19129525
  11. [11]American College of Obstetricians and Gynecologists ACOG Practice Bulletin No. 205: Vaginal Birth After Cesarean Delivery Obstet Gynecol, 2019.PMID 30681543
  12. [12]Al-Zirqi I, Stray-Pedersen B, Forsén L, et al. Uterine rupture: trends over 40 years BJOG, 2016.PMID 25846698
  13. [13]Silver RM, Landon MB, Rouse DJ, et al. Maternal morbidity associated with multiple repeat cesarean deliveries Obstet Gynecol, 2006.PMID 16738145
  14. [14]Bujold E, Mehta SH, Bujold C, et al. Interdelivery interval and uterine rupture Am J Obstet Gynecol, 2002.PMID 12439503
  15. [15]Bujold E, Goyet M, Marcoux S, et al. The role of uterine closure in the risk of uterine rupture Obstet Gynecol, 2010.PMID 20567166
  16. [16]Bruno AM, Allshouse AA, Metz TD Maximum Oxytocin Dose and Uterine Rupture During Trial of Labor After Cesarean Obstet Gynecol, 2025.PMID 41325062
  17. [17]Mao H, Shen P Trial of labor versus elective cesarean delivery for patients with two prior cesarean sections: a systematic review and meta-analysis J Matern Fetal Neonatal Med, 2024.PMID 38485519
  18. [18]Zhang N, Ward H Safety and efficacy of external cephalic version after a previous caesarean delivery: A systematic review Aust N Z J Obstet Gynaecol, 2021.PMID 34169515
  19. [19]Opipari A, Singh S, Taylor M, et al. Recognition of intrapartum uterine rupture, anesthetic management, and maternal-fetal outcomes: strategies for rapid response Curr Opin Anaesthesiol, 2026.PMID 42052858
  20. [20]Marshall NE, Fu R, Guise JM Impact of multiple cesarean deliveries on maternal morbidity: a systematic review Am J Obstet Gynecol, 2011.PMID 22071057

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