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Comparison of a fixed and dynamic protocol for embryo replacement in an IVF/ET programme
D Feldberg1, J A Goldman, M Shelef
1Sherman Fertility Institute, Department of Obstetrics and Gynaecology, Golda Meir Medical Centre, (Hasharon Hospital), Petach-Tikva, Israel.
Human Reproduction (Oxford, England)
|August 1, 1988
Summary
Optimizing embryo replacement timing in in-vitro fertilization (IVF) significantly boosts pregnancy success. A flexible, dynamic approach based on embryo development, rather than fixed hours post-retrieval, markedly improved implantation and pregnancy rates.
Area of Science:
- Reproductive Medicine
- Embryology
- In-Vitro Fertilization
Background:
- Embryo implantation is a critical factor limiting pregnancy rates in in-vitro fertilization (IVF).
- The optimal stage for embryo transfer, typically the four- to eight-cell stage, is crucial for successful implantation.
- Current embryo replacement protocols often use fixed timings post-ovum retrieval.
Purpose of the Study:
- To investigate the impact of flexible embryo replacement timing on pregnancy rates in IVF.
- To compare pregnancy outcomes between fixed-time (48h, 72h) and dynamic embryo replacement strategies.
- To explore the relationship between embryo development stage and uterine receptivity for improved implantation.
Main Methods:
- 120 infertile patients underwent ovarian stimulation (HMG or HMG/FSH).
- Three embryo replacement groups were studied: 48h post-retrieval (Group I), 72h post-retrieval (Group II), and dynamic replacement based on embryonic cleavage (Group III).
- Hormonal levels (oestradiol) and pregnancy rates per transfer were analyzed.
Main Results:
- Pregnancy rates per transfer were 21.8% (Group I), 24.2% (Group II), and 38.7% (Group III).
- The dynamic embryo replacement group (Group III) showed a statistically significant higher pregnancy rate (P < 0.001).
- No significant differences were observed in the average number of embryos transferred or oestradiol levels across groups.
Conclusions:
- A dynamic, flexible approach to embryo replacement, timed with embryonic development, significantly enhances IVF pregnancy rates.
- This strategy may improve pregnancy outcomes by optimizing the interaction between the embryo and the maternal uterus.
- Further research is warranted to fully elucidate the benefits of dynamic embryo replacement protocols.