Delayed fertilization and poor embryonic development associated with impaired semen quality

Area of Science:

• Reproductive Biology
• Infertility Research
• Embryology

Background:

• Delayed fertilization is a frequent occurrence in cycles involving immature oocytes.
• Sperm autoantibodies can complicate the assessment of fertilization issues.
• Understanding factors contributing to fertilization failure is crucial for improving IVF outcomes.

Purpose of the Study:

• To investigate the relationship between impaired sperm parameters and delayed fertilization.
• To compare fertilization and embryonic outcomes in cycles with delayed fertilization versus no fertilization and controls.
• To assess the clinical and prognostic significance of poor sperm quality in assisted reproductive technology.

Main Methods:

• Comparative analysis of sperm parameters (specifically normal forms) across three groups: delayed fertilization (Group A), no fertilization (Group B), and control (Group C).
• Evaluation of fertilization rates and embryonic morphology in relation to sperm quality.
• Exclusion of cycles with sperm autoantibodies to isolate the impact of sperm parameters.

Main Results:

• Group A (delayed fertilization) showed significantly lower percentage of normal sperm forms (24%) compared to controls (51%).
• Fertilization rates in Group A (32%) were substantially lower than in Group C (81%).
• Group A exhibited a high incidence of poor embryonic morphology (82%) compared to Group C (29%).

Conclusions:

• Impaired sperm quality, characterized by reduced normal forms, is strongly associated with delayed fertilization.
• Delayed fertilization and poor embryonic morphology are linked, underscoring the prognostic importance of sperm parameters in IVF.
• These findings emphasize the need for thorough sperm analysis in infertility evaluations to predict and potentially improve treatment success.