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[Morphology in intracytoplasmic sperm injection]

W Küpker¹, S al-Hasani, W Schulze

¹Universitäts-Frauenklinik, Medizinischen Universität Lübeck.

Gynakologisch-Geburtshilfliche Rundschau

|January 1, 1995

Summary

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Severe sperm defects in Oligo-Astheno-Teratozoospermia (OAT) do not impede fertilization via intracytoplasmic sperm injection (ICSI). The study found that failed ICSI is linked to poor sperm-oocyte interaction, not sperm morphology.

Area of Science:

Reproductive Biology
Andrology
Cell Biology

Context:

Oligo-Astheno-Teratozoospermia (OAT) is a common cause of male infertility.
Intracytoplasmic sperm injection (ICSI) is a key assisted reproductive technology for treating severe male factor infertility.
Understanding factors affecting ICSI success is crucial for improving fertility outcomes.

Purpose:

To investigate the impact of severe sperm morphological defects in OAT on ICSI fertilization rates.
To identify specific ultrastructural characteristics of unfertilized oocytes following ICSI.

Summary:

Transmission electron microscopy was used to examine ejaculates from males with OAT and unfertilized oocytes post-ICSI.
A 66% fertilization rate was achieved with ICSI despite severe sperm defects, particularly head and neck abnormalities.

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Unfertilized oocytes showed no signs of activation or sperm chromatin decondensation.

Impact:

The findings suggest that sperm-oocyte interaction, rather than severe sperm defects alone, is the critical factor in ICSI fertilization failure.
This research provides insights into the mechanisms of fertilization failure in ICSI, guiding future research and clinical practice.
Highlights the importance of evaluating sperm-oocyte interaction dynamics in cases of recurrent ICSI failure.