Retrospective case-control analysis. The quality of 145 embryos after PBB was compared to 276 embryos of the same group of women without biopsy.
University-based tertiary-care medical center.
Women with inherited genetics disease.
Laser PBB of IVF embryos for genetic diagnosis.
The study and control embryos were compared for fertilization rate, pronuclear grading, and cleavage-stage parameters on days 1, 2, and 3 after oocyte retrieval.
The study embryos demonstrated higher rates of cleavage arrest (3.6 % vs. 0.7 % ), higher rate of significant fragmentation on day 2 (9.5 % vs. 3.0 % ), and lower rate of good cleavage embryos on day 2 (69.1 % vs. 78.4 % ) compared with control embryos. On day 3, the study embryos had lower cleavage rates (six or more blastomeres; 56.5 % vs. 74.5 % ), higher fragmentation (11.7 % vs. 3.9 % ), higher rate of embryos presenting inferior cleavage pattern (57.2 % vs. 38.5 % ), and lower mean blastomere number (5.8 ¡À 2.1 vs. 6.6 ¡À 1.9) compared with control embryos.
Polar-body biopsy may have a negative effect on embryo quality.