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- Title
Elective single embryo transfer: Comparison of blastocyst and cleavage-stage embryo transfer.
- Authors
KAWAMURA, TOSHIHIRO; MORI, MICHIKO; ARICHI, AKANE; TAJIMA, YUKO; KARASAWA, YASUHIRO; SUGA, KAHORI; IKUMI, SACHIKO; ISHIKAWA, SEIKA; KAWAMURA, MAKIKO
- Abstract
Blastocysts are reportedly suitable for preventing multiple pregnancies as a result of the high implantation rate per embryo. The present study compared clinical results for elective single embryo transfer (ET) between blastocysts and cleavage-stage embryos in order to ascertain the usefulness of blastocyst culturing in single ET. Between January 2002 and December 2004, conventional in vitro fertilization ET and/or intracytoplasmic sperm injection was carried out for single ET in 86 cycles, to prevent multiple pregnancies (for medical reasons or because of patient wishes). Among the 80 cycles in which a fresh embryo was transferred, pregnancy/implantation rates per ET were 35.3% for day 2/3 ET and 50.0% for day 5 ET, and pregnancy/implantation rates per oocyte retrieval were 35.3% for day 2/3 ET and 44.2% for day 5 ET. Ongoing pregnancy/delivery rates per oocyte retrieval were 32.4% for day 2/3 ET and 38.5% for day 5 ET. Monozygotic twinning occurred in one case of day 5 ET. Pregnancy rates per single ET tended to be higher for day 5 ET than for day 2/3 ET. However, no marked differences were identified in ongoing pregnancy/delivery rates per oocyte retrieval between groups. (Reprod Med Biol 2005; 4: 197–201)
- Subjects
EMBRYO transfer; REPRODUCTIVE technology; HUMAN embryo transfer; HUMAN reproductive technology; BLASTOCYST; PLACENTA
- Publication
Reproductive Medicine & Biology, 2005, Vol 4, Issue 3, p197
- ISSN
1445-5781
- Publication type
Article
- DOI
10.1111/j.1447-0578.2005.00105.x