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INTRODUCTION: The Maternal-Fetal Medicine Units Network calculator for vaginal birth after cesarean (VBAC) probability was updated to exclude a race and ethnicity variable, but its impact on marginalized groups is unknown. We assessed the tool with attention to birth history and body mass index (BMI) in a predominately Hispanic cohort and examined the possible effect of discouraging labor after cesarean (LAC) with a low score. METHODS: We conducted a retrospective cohort study of LACs by patients who entered spontaneous or induced labor with a live, nonanomalous fetus in cephalic presentation between 2012 and 2022. Observed VBAC rates were compared with the mean predicted VBAC probability derived from the calculator. Areas under the curve (AUCs) were calculated for the entire cohort and for individuals with LAC with and without prior vaginal birth. A z-test was used to determine the significance between VBAC rates in 4 BMI categories. The impact of discouraging LAC with VBAC probability below 70% was examined. RESULTS: A total of 400 people experienced 507 LACs, with 417 (82.2%) resulting in VBAC compared with a mean predicted probability of 71.2%. The AUC for all LACs was 0.76 (95% CI, 0.71-0.81), whereas the AUC for LACs with prior vaginal birth was 0.70 (95% CI, 0.56-0.85) and without was 0.60 (95% CI, 0.52-0.67). Observed VBAC rates exceeded predicted rates for individuals with overweight and obese BMIs: <25 (79.6% vs 75.6%; P = .520), 25 to 30 (83.2% vs 71.9%; P = .007), 30 to 40 (82.7% vs 70.0%; P = .004), and ≥40 (82.8% vs 58.3%; P = .040). Discouraging LAC below 70% probability might have prevented 71 unsuccessful LACs, 160 initial VBACs, and 57 subsequent VBACs, decreasing the VBAC rate to 39.4% (200/507). DISCUSSION: In a predominately Hispanic cohort, the updated calculator underestimated VBAC potential for people with no vaginal birth history and/or an elevated BMI. Discouraging LAC based on low VBAC probability may prevent both initial and subsequent VBACs.
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Information on feto-fetal transfusion syndrome (FFTS) in higher-order multifetal gestation is limited. We report outcomes of 10 triplet pregnancies treated by fetoscopic laser occlusion of the chorioangiopagous vessels (FLOC). The study period was August 1992 to August 2008. Inclusion criteria were gestational age < or =25 weeks and ultrasound confirmation of monochorionicity in at least one twin set and FFTS. Treatment included FLOC, exit amnioreduction, and cerclage when indicated. Hospital records, placental pathology, neonatal course, and long term follow-up of the mother and infants were reviewed. There were eight triamnionic dichorionic and two triamnionic monochorionic triplets. Mean maternal age was 29.8 years, and five conceived following in vitro fertilization. FFTS stage at treatment was > or =II in all cases, at a mean gestational age 20.9 +/- 2.2 weeks. Two patients required immediate rescue cerclage, and all 10 had hypoproteinemia and anemia. Mean age at delivery was 31.2 +/- 3.4 weeks, with a mean birth weight 1568.4 +/- 498 g for the live-born fetuses. Twenty-three (77%) fetuses survived, with at least one fetus surviving in 9 (90%) cases. Cerebral ultrasound imaging and neurological examination were normal in all neonates, and clinical follow-up has remained normal at 67.5 +/- 56 months for the group. FLOC is feasible in dichorionic and monochorionic triplet pregnancy complicated by FFTS. Outcomes are comparable to our experience with twins, namely improved perinatal survival and neonatal morbidity when compared with alternative treatments.