What are some contraindications for a vaginal birth after cesarean (VBAC)?

The correct answer pertains to specific uterine conditions that may pose significant risks during a trial of labor after a previous cesarean section. A woman who has a previous cesarean delivery may face contraindications for vaginal birth after cesarean (VBAC) if she has certain types of uterine scars or has experienced multiple cesarean deliveries.

One of the most critical factors to consider is the type of uterine incision made during the previous cesarean. For example, a classic vertical incision on the uterus increases the risk of uterine rupture during labor, making VBAC potentially dangerous. Additionally, a history of multiple cesarean deliveries can contribute to complications such as uterine scarring or abnormal placentation, which can further complicate a vaginal delivery attempt. Both the nature of the uterine scarring and the surgical history significantly influence the safety and feasibility of proceeding with a VBAC.

In contrast, the other options highlight conditions that, while they may carry risks during pregnancy, do not specifically contraindicate a VBAC. High blood pressure, gestational diabetes, preeclampsia, obesity, and advanced maternal age are significant factors to be monitored during pregnancy, but they do not uniformly preclude a woman from attempting a VB