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Human Reproduction, Vol. 17, No. 3, 741-743, March 2002
© 2002 European Society of Human Reproduction and Embryology

Transfer at the blastocyst stage of embryos derived from testicular round spermatid injection

Bulent Urman,1, Cengiz Alatas, Senai Aksoy, Ramazan Mercan, Alp Nuhoglu, Alper Mumcu, Aycan Isiklar and Basak Balaban

The Assisted Reproduction Unit, American Hospital of Istanbul

BACKGROUND: Intracytoplasmic injection of testicular round spermatids has been suggested as a salvage treatment in couples when testicular sperm extraction does not yield any mature sperm. However, the success of the procedure is debatable, and controversy surrounds issues such as the presence and (if present) identification of spermatids in testicular tissue. Progression rate to the blastocyst stage of spermatid-derived embryos appears to be low. METHODS: In this study, we investigated the feasibility and outcome of blastocyst stage embryo transfer after round spermatid injection (ROSI). ROSI was undertaken in 58 couples who did not yield mature or elongated sperm to testicular sperm extraction. RESULTS: The incidence of blastocyst formation from two pronuclear oocytes was 7.6%. A total of 16 blastocysts were transferred in 12 patients (20.7%). None of the patients conceived. CONCLUSIONS: The results of this study indicate that the blastocyst stage is reached by only very few ROSI-derived embryos and these embryos do not implant.

Key words: blastocyst/spermatid/ICSI/IVF

1 To whom correspondence should be addressed at: VKV American Hospital, Guzelbahce sok. No:20, Nisantasi 80200, Istanbul, Turkey. E-mail: burman{at}superonline.com

Submitted on February 16, 2001


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