Influence of sperm parameters on embryo quality

Area of Science:

• Reproductive medicine and embryology.
• In vitro fertilization (IVF) and assisted reproductive technologies (ART).
• Male infertility and its impact on reproductive outcomes.

Background:

• Embryo quality is a critical determinant of successful pregnancy following in vitro fertilization (IVF).
• The contribution of male factor infertility to overall IVF success rates requires further investigation.
• Understanding the relationship between sperm characteristics and embryo development is essential for optimizing fertility treatments.

Purpose of the Study:

• To investigate the correlation between specific sperm defects and the resulting embryo morphology.
• To assess the influence of semen quality parameters on the quality of embryos developed during IVF.
• To determine the impact of male infertility on embryo quality compared to tubal disease.

Main Methods:

• Retrospective analysis of 710 embryo transfers from IVF cycles.
• Patient groups included those with tubal disease (626) and male infertility (84).
• Embryo morphology was assessed and classified, correlating with semen parameters and follicular growth.

Main Results:

• Embryos with good morphology were associated with significantly higher pregnancy rates (34%) compared to intermediate (24%) and poor (10%) morphology.
• Poor embryo morphology was more frequent in male infertility cases (26/84) than in tubal disease (114/626).
• Sperm defects, including lower percentages of morphologically normal sperm and higher rates of postacrosomal abnormalities, were linked to poor embryo quality. Sperm counts below 10 x 10(6)/mL were associated with a lower percentage of good morphology embryos.

Conclusions:

• Semen quality, particularly sperm head abnormalities, significantly influences embryo quality.
• The male gamete plays a crucial role in the early stages of embryogenesis.
• Addressing male factor infertility is vital for improving IVF outcomes and embryo development.