[In vitro maturation, fertilization and embryo transfer of human immature oocyte]

To try a new method for treating infertile women by in vitro maturation technique.

To set up in vitro maturation (IVM) program, including stimulating regimen, oocyte retrieval technique, and culture system of the immature oocytes with the medium consisted of essential supplements and human mature follicular fluid. IVM was performed in 30 infertile patients (35 cycles), (1) with polycystic ovary syndrome (POCS) (14/30), (2) ovary hyperstimulation syndrome (OHSS) in the previous stimulating cycles (6/30), and (3) retardation of the oocyte growth in conventional IVF cycles (10/30).

Totally 203 oocytes were obtained, with a mean of 5.8 oocytes each cycle. First polar bodies were observed in 156 oocytes, maturation rate was 76.8%. There were 120 oocytes getting into pronucleus stage, normal fertilization rate was 76.9%. Embryo transfer was performed in 33 cycles. Eight pregnancies were established, pregnancy rate was 24%. Five patients have delivered 7 healthy babies.

The result of our study indicated that IVM is one of the new assisted reproductive technologies for the infertile women with PCOS, poor response to stimulation and the history of OHSS. Human mature follicular fluid would be an ideal component in the maturation medium for oocyte maturation in vitro and provides a much simplified and practical method for clinical use.