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Clinical efficacy of spermatid conception: analysis using a new spermatid classification scheme
M Sousa1, A Barros, K Takahashi
1Laboratory of Cell Biology, Institute of Biomedical Sciences, Department of Medical Genetics, Faculty of Medicine, University of Porto, Centre for Reproductive Genetics, Porto, Portugal.
Human Reproduction (Oxford, England)
|May 15, 1999
Summary
Elongated spermatid injection (ELSI) shows higher fertilization and pregnancy success than round spermatid injection (ROSI). Spermatid developmental stage significantly impacts outcomes, with ELSI leading to ongoing pregnancies and live births.
Area of Science:
- Reproductive Medicine
- Andrology
- Infertility Treatment
Background:
- Spermatogenesis is a complex process with potential for developmental arrest.
- Round spermatid injection (ROSI) and elongated spermatid injection (ELSI) are assisted reproductive technologies for severe male infertility.
- The developmental stage of spermatids used in these procedures may influence outcomes.
Purpose of the Study:
- To evaluate fertilization and pregnancy outcomes of ROSI and ELSI cycles.
- To correlate outcomes with spermatid developmental stage using a specific classification scheme.
- To compare the efficacy of ROSI versus ELSI.
Main Methods:
- Analysis of 50 ROSI and 20 ELSI treatment cycles.
- Classification of spermatid developmental stages (Sa1, Sb2, Sd1, Sd2) to identify arrest points.
- Tracking of fertilization rates, pregnancy establishment, and pregnancy outcomes.
Main Results:
- Spermiogenesis arrest predominantly occurred at early (Sa1) or late (Sd1, Sd2) stages.
- ELSI cycles demonstrated higher fertilization rates compared to ROSI cycles.
- No pregnancies were achieved with ROSI; nine pregnancies resulted from ELSI, including ongoing singleton and twin pregnancies, and live births.
Conclusions:
- ELSI is more effective than ROSI, yielding successful pregnancies and live births.
- Spermatid developmental stage is a critical factor influencing the success of spermatid injection techniques.
- Further research into spermatid maturation and selection is warranted for optimizing these fertility treatments.