Time-lapse videography of human oocytes following intracytoplasmic sperm injection: Events up to the first cleavage division |
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| Institution: | 1. Fertility North, Joondalup Health Campus, Joondalup, Western Australia, Australia;2. School of Medical Sciences, Edith Cowan University, Joondalup, Western Australia, Australia;3. Department of Obstetrics and Gynaecology, University of Malaya, Kuala Lumpur, Malaysia;1. Reproductive Medicine Unit, GynePro Medical Centers, Bologna, Italy;2. Department of Life, Health, and Environmental Sciences, University of L’Aquila, L’Aquila, Italy;1. The Reproductive Center of Huzhou Maternity and Child Health Care Hospital, Huzhou 313000, China;2. Center for Reproductive Medicine, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, China;1. Norwegian National Advisory Unit on Women''s Health, Women and Children''s Division, Oslo University Hospital Rikshospitalet, Oslo, Norway;2. Department of Obstetrics, Women and Children''s Division, Oslo University Hospital Rikshospitalet, Oslo, Norway;3. Section of Reproductive Medicine, Department of Gynecology, Oslo University Hospital Rikshospitalet, Oslo, Norway;4. Institute of Clinical Medicine, University of Oslo, Oslo, Norway;1. IVI Madrid, Madrid, Spain;2. Igenomix, Valencia, Spain;1. Aiiku Ladies Clinic, Kagoshima, Japan;2. Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University, Kagoshima, Japan |
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| Abstract: | A total of 341 fertilized and 37 unfertilized oocytes from 63 intracytoplasmic sperm injection (ICSI) treatment cycles were included for retrospective assessment using the Embryoscope? time-lapse video system. The second polar body (pb2) extrusion occurred at 2.9 ± 0.1 h (range 0.70–10.15 h) relative to sperm injection. All oocytes reduced in size following sperm injection (p < 0.05) with shrinkage ceasing after 2 h in the unfertilized and at pb2 extrusion in the fertilized oocytes. Pb2 extrusion was significantly delayed for women aged >38 years compared to those <35 years (3.4 ± 0.2 vs. 2.8 ± 0.1, p < 0.01) or 35–38 years (3.4 ± 0.2 vs. 2.8 ± 0.1, p < 0.01), but timing was not related to the Day 3 morphological grades (1–4) of subsequent embryos (2.9 ± 0.1, 2.9 ± 0.1, 2.8 ± 0.2 and 3.0 ± 0.1; p > 0.05 respectively). A shorter time of first cleavage division relative to either sperm injection or pb2 extrusion is associated with both top grade (AUC = 0.596 or 0.601, p = 0.006 or 0.004) and usable embryos (AUC = 0.638 or 0.632, p = 0.000 respectively) on Day 3. In summary, (i) pb2 of human oocytes extrudes at various times following sperm injection, (ii) the timing of pb2 extrusion is significantly delayed when female age >38 years, but not related to subsequent embryo development, (iii) all human oocytes reduce in size following sperm injection, (iv) completion of pb2 extrusion in the fertilized oocytes is a pivotal event in terminating shrinkage of the vitellus, and (v) time to first cleavage division either from sperm injection or pb2 extrusion is a significant predictive marker for embryo quality on Day 3. |
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| Keywords: | Oocyte Fertilization ICSI Second polar body Time-lapse |
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