Management of Subsequent Pregnancy After Previous Lower Segment Cesarean Section

Candidate Selection and Counseling

The American College of Cardiology recommends that for women with one previous low transverse LSCS, trial of labor after cesarean (TOLAC) should be offered as the preferred approach, as approximately 74% achieve successful vaginal birth with better short-term maternal outcomes compared to repeat cesarean delivery 1, 2
Previous vaginal delivery is the single most important predictor of successful VBAC, with women who have had prior vaginal births showing significantly higher success rates 1, 2, 3
Women with a previous successful VBAC have even greater likelihood of success in subsequent attempts 2
TOLAC is appropriate for most women with one or two previous cesarean deliveries with low transverse uterine incisions 2
Early prenatal counseling should address the patient's specific risk factors and reasons for the previous cesarean 2

Misoprostol must never be used for cervical ripening or labor induction in women with previous cesarean delivery due to significantly elevated uterine rupture risk 1, 2
Oxytocin carries a 1.1% risk of uterine rupture (95% CI, 0.9% to 1.5%) 1, 2
Prostaglandin E2 carries a 2% risk of uterine rupture (95% CI, 1.1% to 3.5%) 1, 2
Labor induction with oxytocin reduces likelihood of successful VBAC 1
Estimated fetal weight ≥4,000g (8 lb, 13 oz) decreases success rates 1
Lack of previous vaginal delivery decreases success rates 1, 3

Neuraxial analgesia (epidural or spinal) should be offered to all women attempting TOLAC 2
Early placement of neuraxial catheter is appropriate and can facilitate rapid conversion to anesthesia if emergency cesarean becomes necessary 2
Establish intravenous access before initiating neuraxial analgesia and maintain throughout labor 2
Both epidural and general anesthesia are acceptable for cesarean delivery if needed, with careful attention to avoiding hypotension 4

Short-term maternal outcomes are as good or better with successful VBAC compared to repeat cesarean delivery 2
Repeat cesarean delivery increases long-term risks of abnormal placentation, hysterectomy, and surgical complications in future pregnancies 2
Women with previous uterine surgery require monitoring for abnormal placentation 3
Perinatal mortality is slightly higher with TOLAC compared to elective repeat cesarean delivery 1, 2

Cesarean delivery should be reserved for obstetric indications or emergency maternal health reasons 4
Multiparous women with previous vaginal deliveries have very high rates of successful vaginal birth; maintain a high threshold for cesarean intervention in this population 3
Delivery plan should ideally be established by the end of the second trimester 4
Valsalva maneuver during labor is well tolerated in women with previous cesarean 4
Bleeding rates and transfusion requirements are higher with cesarean section compared to vaginal delivery 4

Failing to recognize previous vaginal delivery as the strongest predictor of VBAC success 1, 3
Using misoprostol for any indication in women with uterine scars 1, 2
Overreliance on predictive scoring models, which have limited clinical value 2
Failing to counsel patients early in prenatal care about TOLAC options 2