Risk factors for OASIS during a VBAC

A VBAC is a Vaginal Birth After Cesarean section. In a VBAC, the mother had a cesarean section delivery and then in a later pregnancy she wants to try and deliver vaginally.  A VBAC can be done safely, but it is important that the nurses and doctors be very vigilant. The are many risks associated with a VBAC, including but not limited to uterine rupture and bleeding risks.  

 

VBACs have also been shown to have a higher risk of obstetric anal sphincter injuries (OASIS). Anal sphincter injuries are also known as 3rd or 4th degree tears, and can lead to loss of bowel control in women (Weinstein et al). One recent study by D’Souza and colleagues retrospectively looked into just what causes OASIS in a VBAC.  

 

Using the University of Southhampton maternal database, they looked at over 1300 women who delivered via VBAC. 8.1% of those women suffered from OASIS. Using the data, the researchers determined that increased risk occurs in older women that had infants that weighed more than their first delivery via c-section. They also found that an emergency c-section doubled the risk of having an anal sphincter injury later in a VBAC, while having a mediolateral episiotomy cut the risk in half (D’Souza et al 2019).  

 

If you suffer complications due to a VBAC, you may have a case against the doctor, medical team, or hospital. Call our attorneys now to discuss your case in a free consultation. 

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