Abstract
Introduction
This is the cumulative technical report on the operative procedures and limitations of fetoscopic bag insertion, intestinal bag placement, and bag fixation to the fetus in a series of pilot studies in an ovine model for prenatal treatment of gastroschisis.
Material and methods
In 24 German blackhead sheep, a surgically created gastroschisis was managed by fetoscopic placement of the extruded intestines into a bag. The bag was then fastened onto the fetal abdominal wall. Different materials (sterile gloves, latex condoms, laparosopic retrieval bags) and different fixation techniques (laparoscopic staplers, interrupted and continuous sutures) have been examined. The fetuses were retrieved and evaluated at the end of gestation.
Results
Uterine bag insertion was successful in 15 of 24 (62.5%) and intestinal bag placement in 10 of 15 available fetuses (66.6%). The main factor limiting fetoscopic procedures was chorioamniotic separation (CAS). Sterilized condoms provided the most appropriate type of bags and the V-Loc™ running suture, the most expedient type of fixation, which was achieved in 9 of the 10 fetuses (complete = 2, partially = 7) by using a three port access (5 mm and 2 × 3 mm). All bags were encountered completely or partially dislocated from the fetus at the end of gestation.
Conclusions
Fetoscopic intestinal bag placement and fixation in gastroschisis technically demanding. None of the evaluated techniques led to permanent anchorage of the bag to the fetus. The development of specially designed instruments, bags and fixation methods is required to optimize this approach.
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Acknowledgements
Robert Bergholz and Thomas Krebs contributed equally to this manuscript
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Robert Bergholz and Thomas Krebs were promoted by a grant of the foundation “Hamburg macht Kinder gesund e.V. Robert Bergholz and Thomas Krebs received funding by Karl Storz Company GmbH, Tuttlingen, Germany, in form of materials (Storz Camera Telepack, Storz 3- and 5-mm laparoscopic instruments). Birte Cremieux, Carla Georgi, Felipe Fromm, Michael Boettcher, Thomas Andreas, Bastian Tiemann, Katharina Wenke, Konrad Reinshagen and Kurt Hecher have no conflict of interest of financial ties to disclose.
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Bergholz, R., Krebs, T., Cremieux, B. et al. Fetoscopic techniques for prenatal covering of gastroschisis in an ovine model are technically demanding and do not lead to permanent anchoring on the fetus until the end of gestation. Surg Endosc 35, 745–753 (2021). https://doi.org/10.1007/s00464-020-07441-7
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Keywords
- Animal model
- Fetal surgery
- Fetendo
- Fetoscopy
- Fetus
- Gastroschisis
- Prenatal treatment