Clinical outcome of treatment cycles using preimplantation genetic diagnosis for structural chromosomal abnormalities

Objectives To explore oocyte recovery, embryo quality, the number of transf erable embryos and pregnancy rate after preimplantation genetic diagnosis ( PGD) in patients with structural chromosomal aberrations. Methods PGD was performed in seven couples with Robertsonian translocations (Rob), eight couples with reciprocal translocations (Rec), two couples wit h inversions and one couple with a deletion. A total of 43 treatment cycles were carried out. Results A total of 14.2 oocytes per cycle were retrieved. Fertilisation and cleavage rates were 63% and 58%, respectively. Of the biopsied embryos 20% were transferable. Comparison of the Rob and Rec group revealed no signifi cant differences in number of oocytes, fertilisation or cleavage rates. The number of transferable embryos after biopsy was significantly higher in th e Rob group than in the Rec group. When embryo transfer (ET) was performed the pregnancy rate did not differ between the Rob and the Ree groups. Twent y-eight embryo transfers (one or two embryos) were carried out leading to e ight clinical pregnancies (29% per ET): two twins, four singletons, one mis carriage and one ectopic pregnancy. All the children are carriers of balanc ed chromosomal aberrations. Conclusion An acceptable pregnancy rate can be achieved among couples with structural chromosomal abnormalities. Copyright (C) 2001 John Wiley & Sons, Ltd.