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Sperm retrieval for intra-cytoplasmic sperm injection in non-obstructive azoospermia
G M Colpi1, G Piediferro, F Nerva
1Andrology Unit, San Paolo Hospital, Polo Universitario, Via A. di Rudinì 8, 20142 Milan, Italy. gmcolpi@yahoo.com
Summary
Surgical testicular sperm retrieval offers biological fathering for non-obstructive azoospermia (NOA). Microsurgical TESE improves success rates, but ICSI outcomes in NOA are less favorable than in obstructive azoospermia.
Area of Science:
- Reproductive Medicine
- Andrology
- Genetics
Background:
- Non-obstructive azoospermia (NOA) presents a significant challenge for biological fathering.
- Intra-cytoplasmic sperm injection (ICSI) is the primary assisted reproductive technology for NOA patients.
- Surgical testicular sperm retrieval (TESE) is the sole option for sperm acquisition in NOA.
Purpose of the Study:
- To evaluate the efficacy of TESE techniques for sperm retrieval in NOA patients.
- To compare the success rates of conventional TESE versus microsurgical TESE (mTESE).
- To analyze the impact of testicular histology and genetic factors on TESE outcomes.
- To assess the subsequent ICSI success and abortion rates in NOA couples.
Main Methods:
- Review of literature data on TESE and mTESE success rates across different histological patterns.
- Analysis of factors influencing sperm retrieval, including FSH levels, testicular volume, and microdeletions (AZFa, AZFb).
- Comparison of ICSI outcomes (birth and abortion rates) between NOA and obstructive azoospermia (OA) groups.
Main Results:
- Successful sperm retrieval in NOA is histology-dependent, not correlated with FSH or testicular volume.
- Concurrent AZFa and AZFb microdeletions predict retrieval failure.
- mTESE demonstrates higher retrieval rates compared to conventional TESE.
- Hypospermatogenesis shows the highest success rates (up to 100%), while Sertoli cell-only syndrome has the lowest (25%).
- ICSI from NOA yields lower birth rates (19%) and significantly higher abortion rates (11.5%) compared to OA (28% and 2.5%, respectively).
Conclusions:
- Testicular sperm extraction (TESE), particularly microsurgical TESE (mTESE), is crucial for achieving biological fatherhood in NOA.
- Histology, specifically the presence of spermatids, is the key predictor of TESE success.
- Genetic microdeletions (AZFa/AZFb) are associated with failed sperm retrieval.
- Couples with NOA have lower overall fertility prognosis due to reduced ICSI success and increased abortion rates.