Clinical Characteristics Associated With Very Preterm Delivery Despite Transabdominal Cerclage: A Cohort Study.

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Surgical Interventions for Preterm Birth

Background:

• Transabdominal cerclage (TAC) is a surgical procedure used to prevent preterm birth in women with cervical insufficiency.
• Identifying factors associated with TAC failure is crucial for optimizing its use and improving pregnancy outcomes.

Purpose of the Study:

• To determine factors associated with unsuccessful transabdominal cerclage (TAC) insertion, defined as delivery before 32 weeks.
• To evaluate the impact of maternal demographics, preterm birth risk factors, and operative details on TAC success.

Main Methods:

• An observational cohort study was conducted at a tertiary-level London hospital.
• Data from 125 pregnancies undergoing TAC between 2011 and 2024 were analyzed.
• Statistical comparisons (t-test, chi-squared) were used to identify significant factors.

Main Results:

• Only 6.4% of pregnancies following TAC resulted in delivery before 32 weeks.
• Previous trachelectomy was strongly associated with preterm delivery (p < 0.0001).
• Significantly shorter cervical lengths were observed in early pregnancy for those delivering preterm compared to those delivering later.

Conclusions:

• Transabdominal cerclage (TAC) demonstrates high effectiveness, with over 90% of women delivering beyond 32 weeks.
• Prior trachelectomy and short cervical length in early pregnancy are key factors linked to unsuccessful TAC.
• The effectiveness of TAC is sustained across subsequent pregnancies, with many women achieving multiple term births with the same cerclage.