Intracytoplasmic sperm injection increases embryo fragmentation without affecting clinical outcome

Area of Science:

• Reproductive Medicine
• Embryology
• Infertility Treatment

Background:

• Conventional in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) are assisted reproductive technologies.
• Embryo quality, specifically fragmentation, is a critical factor in successful implantation.
• Understanding the impact of different fertilization methods on embryo development is essential for optimizing treatment outcomes.

Purpose of the Study:

• To compare the effects of ICSI versus conventional IVF on embryo fragmentation.
• To evaluate the impact of ICSI on implantation rates compared to IVF.
• To determine if ICSI influences the proportion of nonfragmented embryos suitable for transfer.

Main Methods:

• A comparative study involving 253 infertility patients undergoing either ICSI (71 patients) or IVF (182 patients).
• Key parameters analyzed included patient age, semen analysis, number of embryos transferred, embryo fragmentation, implantation rate, and pregnancy rate.
• Embryo fragmentation was consistently assessed by a single observer throughout the study period.

Main Results:

• A statistically significant difference in mean embryo grade was observed between IVF (2.2 +/- 0.84) and ICSI (2.5 +/- 0.77), with P = 0.01.
• The IVF group exhibited a significantly higher proportion of nonfragmented (grade I) embryos compared to the ICSI group (P < 0.01).
• Despite differences in embryo fragmentation, implantation and pregnancy rates were comparable between the two groups.

Conclusions:

• ICSI may be associated with increased embryo fragmentation, regardless of semen parameters.
• The ICSI procedure may result in a lower yield of nonfragmented (grade I) embryos.
• Both ICSI and conventional IVF demonstrate similar implantation and pregnancy rates in the studied patient population.