Fetoscopic laser ablation vs standard management for Type-II and Type-III vasa previa
S Backley1, R H Chmait2, E P Bergh1
1UTHealth Houston Fetal Institute, Division of Fetal Intervention, Department of Obstetrics, Gynecology and Reproductive Sciences, McGovern Medical School at UTHealth Houston, Houston, TX, USA.
Summary
Fetoscopic laser ablation (FLA) for vasa previa (VP) allows for later delivery and vaginal birth, reducing neonatal complications compared to standard management. This alternative approach offers improved outcomes for both mother and baby.
Area of Science:
- Maternal-Fetal Medicine
- High-Risk Pregnancy Management
- Minimally Invasive Fetal Surgery
Background:
- Standard management (SM) for vasa previa (VP) involves early hospitalization and scheduled Cesarean delivery.
- Fetoscopic laser ablation (FLA) has emerged as a potential alternative for specific VP types (II and III).
- Limited comparative data exists on maternal and neonatal outcomes between FLA and SM.
Purpose of the Study:
- To compare maternal and neonatal outcomes in pregnancies with Type-II or -III VP managed with third-trimester FLA versus standard management (SM).
- To evaluate the efficacy of FLA as an alternative to SM in improving delivery timing and mode.
- To assess the impact of FLA on maternal antepartum stay and neonatal outcomes.
Main Methods:
- A cohort study of antenatally diagnosed Type-II or -III VP cases at two US referral centers (September 2016 - December 2023).
- Prospective follow-up for patients undergoing elective FLA; retrospective selection for the SM cohort.
- Primary outcome: gestational age at delivery. Secondary outcomes included mode of delivery, maternal antepartum stay, and neonatal complications.
Main Results:
- Fetoscopic laser ablation (FLA) was performed in 35 of 67 (52.2%) singleton pregnancies with Type-II or -III VP.
- FLA cohort delivered significantly later (median 36.0 weeks) compared to SM (median 34.4 weeks) (P < 0.001).
- FLA was associated with a higher rate of vaginal delivery (62.9%), shorter maternal antepartum stay (1 day vs 16 days), and reduced need for neonatal blood transfusion (0% vs 18.8%) compared to SM.
Conclusions:
- Third-trimester FLA is a viable alternative to standard management for Type-II or -III vasa previa.
- FLA facilitates delivery at a later gestational age and increases the likelihood of vaginal delivery.
- Further research is warranted to fully elucidate the benefits of FLA for maternal and neonatal outcomes.
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