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Where does the embryo implant after embryo transfer in humans?
K Baba1, O Ishihara, N Hayashi
1Department of Obstetrics and Gynecology, Saitama Medical Center, Saitama Medical School, Kawagoe, Japan. baba@bme.rcast.u-tokyo.ac.jp
Fertility and Sterility
|January 13, 2000
Summary
Most embryos implant near the initial transfer site after embryo transfer (ET). About 80% of embryos remain in the deposited area, while 20% migrate.
Area of Science:
- Reproductive Medicine
- Embryology
- Ultrasound Imaging
Background:
- Understanding human embryo implantation post-embryo transfer (ET) is crucial for improving pregnancy rates.
- Previous studies have not precisely located embryo deposition and subsequent implantation sites.
Purpose of the Study:
- To investigate the precise location of human embryo implantation following embryo transfer.
- To correlate initial embryo deposition with the final implantation site.
Main Methods:
- Prospective analysis of 60 infertile women undergoing embryo transfer.
- Utilized three-dimensional transabdominal and transvaginal ultrasound to track air bubbles from ET and locate gestational sacs.
Main Results:
- Twenty-two pregnancies resulted from 60 embryo transfers, with 32 gestational sacs identified.
- Twenty-six of 32 embryos (81.25%) were located within or between the catheter tip site and the air bubble spread area immediately post-ET.
Conclusions:
- Approximately 80% of embryos implant in the vicinity of the initial transfer site.
- Around 20% of embryos implant in areas different from their initial deposition, suggesting potential embryo migration.