Effects of laser polar-body biopsy on embryo quality.

OBJECTIVE

To evaluate the effect of laser polar-body biopsy (PBB) for preimplantation genetic diagnosis on embryo quality.

STUDY DESIGN

Retrospective case-control analysis. The quality of 145 embryos after PBB was compared to 276 embryos of the same group of women without biopsy.

SETTING

University-based tertiary-care medical center.

PATIENT(S): Women with inherited genetics disease.

INTERVENTION(S): Laser PBB of IVF embryos for genetic diagnosis.

MAIN OUTCOME MEASURE(S): 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.

RESULT(S): 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 ± 2.1 vs. 6.6 ± 1.9) compared with control embryos.

CONCLUSION(S): Polar-body biopsy may have a negative effect on embryo quality.