The Effect of Uterine Entry In Fetoscopic Laser Photocoagulation for Twin-To-Twin Transfusion Syndrome

Patients who choose to undergo fetoscopic selective laser photocoagulation (SFLP) at Texas Children's Fetal Center will be offered participation in this research study by study investigators. Description of study rationale and design and a focused interview by the study coordinator to afford potential participants a formal opportunity to examine what they have learned about the research study in the course of their evaluation and discuss how they feel about enrolling in the research study. Once the patient is deemed eligible the informed consent process will be reviewed. If patients elect to participate in the study, informed consent will be obtained, and participants will be provided a copy of the signed consent.

After consent has been obtained, participants will be randomized into two groups ("direct entry" and "Seldinger technique").

Procedure: Selective laser photocoagulation (SFLP) is standard of care for the treatment of complicated monochorionic twin pregnancies. Entry into the uterus for SFLP is achieved under ultrasound guidance using one of two accepted methods, direct entry or the Seldinger technique. Intravenous sedation with local anesthesia at the site of insertion has been found to provide sufficient maternal anesthesia for the procedure.

Group I - Direct entry: The surgeon will gain access to the uterus by inserting a sharp trocar through a small incision in the skin. After access has been established, the trocar is removed and a small tube called a cannula is left in place.

Group II - Seldinger technique: The surgeon will gain access to the uterus by inserting needle through a small incision in the skin and run a guide wire through the needle so a thin tube called a cannula can be placed over the wire.

Follow-Up:

Participants will be monitored after the procedure and upon discharge from the hospital they are free to resume care with their primary doctor. Investigators will collect follow-up data on the health of the participant and the babies until the babies turn one month old.

• Rate of Chorioamniotic Membrane Separation (CAS) [Срок оценки: From the post-surgical period (outside the first 24 hours) until delivery, up to 25 weeks]
• Gestational Age at Delivery [Срок оценки: At delivery]
• Preterm Birth [Срок оценки: At delivery]
• Procedure to Delivery Interval [Срок оценки: At delivery]
• Placental Abruption [Срок оценки: Up to hospital discharge post-procedure (up to 5 days)]
• Chorioamnionitis [Срок оценки: Up to hospital discharge post-procedure (up to 5 days)]
• Septostomy [Срок оценки: Up to hospital discharge post-procedure (up to 5 days)]
• Preterm Premature Rupture of Membranes (PPROM) [Срок оценки: At delivery]