Risk Assessment and Management of C-Scar Rupture

Initial Risk Stratification

Inter-delivery interval <18 months significantly increases rupture risk, according to the American Academy of Family Physicians 2, 1
Classic uterine scar (vertical incision) carries substantially higher rupture risk than low transverse scars, as noted by the American Academy of Family Physicians 2
Multiple prior cesarean sections increase the risk of placenta accreta, with the risk increasing from 12.9/10,000 after one CS to 78.3/10,000 after three CS, as reported by the American College of Obstetricians and Gynecologists 1
Scar defect (niche) evaluation is present in 24-88% of women with prior cesarean section, according to the American College of Obstetricians and Gynecologists 1

Documenting the exact number of prior cesarean sections is crucial to quantify risk, as recommended by the American College of Obstetricians and Gynecologists 1
Measuring inter-delivery interval is essential, as an interval <18 months significantly increases rupture risk, according to the American Academy of Family Physicians 2, 1
Serial ultrasound monitoring of scar integrity every 2-4 weeks is recommended, as suggested by the American College of Obstetricians and Gynecologists 1
Left uterine displacement must be maintained during any procedures to prevent aortocaval compression, as recommended by the American College of Obstetricians and Gynecologists 1
Ensuring optimal uteroplacental perfusion and maternal oxygenation during any intervention is crucial, as noted by the American College of Obstetricians and Gynecologists 1
The overall rupture risk is 0.22% baseline, increasing to 0.35% when labor occurs, according to the American College of Obstetricians and Gynecologists 1

Classic uterine scar is an absolute contraindication to TOLAC, as stated by the American Academy of Family Physicians 2
Inter-delivery interval <18 months is a relative contraindication requiring individualized assessment, according to the American Academy of Family Physicians 2
Three or more prior cesarean sections significantly increase rupture risk, as reported by the American College of Obstetricians and Gynecologists 1
Avoiding misoprostol entirely is recommended, as it carries a 13% rupture rate in the third trimester, according to the American Academy of Family Physicians 2
Prostaglandin E2 carries a 2% rupture risk (95% CI, 1.1-3.5%), as noted by the American Academy of Family Physicians 2
Oxytocin induction has a 1.1% rupture risk (95% CI, 0.9-1.5%), according to the American Academy of Family Physicians 2
Mechanical methods (Foley catheter) have no reported ruptures in available studies, as stated by the American Academy of Family Physicians 2
Decision-to-delivery time <18 minutes after suspected rupture results in normal neonatal outcomes, according to the American Academy of Family Physicians 2

Two-layer hysterotomy closure is associated with a lower rate of uterine rupture in subsequent pregnancies, as reported by the American College of Obstetricians and Gynecologists 3, 4, 5
Blunt expansion of transverse uterine hysterotomy reduces surgical blood loss, according to the American College of Obstetricians and Gynecologists 3, 4, 5
Subcutaneous tissue reapproximation if ≥2 cm thickness is recommended, as suggested by the American College of Obstetricians and Gynecologists 3, 4, 5
Subcuticular suture for skin closure reduces wound complications compared to staples, according to the American College of Obstetricians and Gynecologists 3, 4, 5

Never using misoprostol for cervical ripening or labor induction in women with prior cesarean section in the third trimester is recommended, as stated by the American Academy of Family Physicians 2
Not delaying surgical intervention for ruptured CSP, as expectant management has a poor prognosis and leads to hysterectomy, is crucial, according to the American College of Obstetricians and Gynecologists 2
Not proceeding with TOLAC without immediate surgical capability for emergency cesarean within 18 minutes of suspected rupture is essential, as noted by the American Academy of Family Physicians 2

Perinatal mortality is higher with TOLAC/VBAC compared to repeat cesarean delivery, according to the American Academy of Family Physicians 2
Maternal mortality is lower with TOLAC compared to repeat cesarean delivery, as reported by the American Academy of Family Physicians 2
Each additional cesarean increases future pregnancy risks, including abnormal placentation, hysterectomy, and surgical complications, according to the American Academy of Family Physicians 2
Placenta previa incidence increases with the number of prior cesarean sections, with an incidence of 9/1,000 after one CS, 17/1,000 after two CS, and 30/1,000 after three or more CS, as noted by the American Academy of Family Physicians 2