Comparison of fertilization and embryonic development in sibling in vivo matured oocytes retrieved from different sizes follicles from in vitro maturation cycles

Abstract

Purpose: To examine the fertilization and developmental potential of sibling mature oocytes collected from different follicle sizes on day of retrieval in in vitro maturation (IVM) cycles. Methods: Two hundred thirty eight hCG-primed IVM cycles were performed in 213 patients with polycystic ovaries. If sibling mature oocytes were retrieved on day of collection, they were divided into two groups, Group 1 (n = 78): M-II oocytes obtained from follicles size 10-14 mm; Group 2 (n = 192): M-II oocytes obtained from follicles size <10 mm. Results: Of the 238 cycles, 63 cycles had more than one M-II oocytes retrieved (total M-II oocytes = 270) both from Groups 1 and 2. There were no significant differences between the two groups for oocyte diameter (117.2 mm vs. 116.9 mm), fertilization (79.5% vs. 72.4%) and good quality embryo on day 3 (66.1% vs. 56.8%). Conclusions: The M-II oocytes retrieved from the cohort of follicles (<10 mm diameter) can produce the same quality of embryos as that from large follicles, likely contributing to improve the clinical outcome. © 2010 Springer Science+Business Media, LLC.