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Immaturity and aneuploidy in human oocytes after different stimulation protocols.
M H Pieters1, J C Dumoulin, C M Engelhart
1Academische Ziekenhuis Maastricht, The Netherlands.
Fertility and Sterility
|August 1, 1991
Summary
The gonadotropin-releasing hormone agonist (GnRH-a)/human menopausal gonadotropin (hMG) stimulation protocol resulted in fewer immature oocytes compared to clomiphene citrate (CC)/hMG, suggesting improved oocyte maturation and fertilization potential.
Area of Science:
- Reproductive Endocrinology
- In Vitro Fertilization (IVF)
Background:
- Oocyte immaturity and aneuploidy are critical factors affecting IVF success.
- Different ovarian stimulation protocols may influence oocyte quality and developmental potential.
Purpose of the Study:
- To compare oocyte immaturity and aneuploidy rates between two distinct ovarian stimulation protocols: clomiphene citrate/human menopausal gonadotropin (CC/hMG) and gonadotropin-releasing hormone agonist/human menopausal gonadotropin (GnRH-a/hMG).
Main Methods:
- A retrospective study was conducted on 143 patients undergoing IVF.
- Patients were divided into two groups based on stimulation protocol: CC/hMG (n=65) or GnRH-a/hMG (n=78).
- Analysis focused on unfertilized oocytes to assess immaturity and aneuploidy rates.
Main Results:
- GnRH-a/hMG stimulation yielded significantly more oocytes and higher fertilization rates than CC/hMG.
- Oocyte immaturity was significantly lower with GnRH-a/hMG (17.8%) compared to CC/hMG (33.9%).
- Aneuploidy rates were comparable between the two stimulation protocols.
Conclusions:
- The GnRH-a/hMG protocol leads to oocytes that are closer to the natural ovulation timing, potentially enhancing maturation.
- This protocol may offer improved oocyte maturation, fertilization, and subsequent pregnancy rates in IVF treatments.