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• W2976475210 abstract "To identify the blastulation rate (BR) of pre-blastocysts between days 5 (D5) and 6 (D6) of embryo culture and its determinants. Retrospective cohort We analyzed in vitro fertilization (IVF) cycles occurring between 2016 and 2018 at a single academic center. Due to embryo culture being performed in a grouped fashion, only fresh IVF cycles where the total embryo numbers in culture were equal on D5 (after embryo transfer [ET] or cryopreservation) and D6 were included. Blastulation was defined as the presence of a new blastocyst on D6 (number of D6 blastocysts minus number of D5 blastocysts, divided by the number of embryos). Good blastulation was defined as the presence of a good/excellent grade expanded or further developed blastocyst on D6 (number of good/excellent grade expanded or further developed blastocysts on D6 divided by the number of embryos). Frozen ET and donor cycles were excluded. Patient and cycle characteristics were extracted from our IVF database and are listed in Table 1. Generalized estimating equations with logistic regression were used in iterative fashion to calculate adjusted odds ratios (OR) with 95% confidence intervals (CI) for selected parameters. We analyzed 1037 cycles from 859 patients, characteristics of which are listed in Table 1. BR between D5 and D6 was 24.57% (1639/6670). Good BR was 23.18% (1546/6670). Determinants of blastulation were; number of pre-blastocysts on D5 (OR: 1.70, 95% CI: 1.51-1.92), number of good/excellent blastocysts on D5 (OR: 1.15, 95% CI: 1.08-1.23), and fresh ET on D5 (OR: 1.52, 95% CI: 1.07-2.16). Determinants of good blastulation included; number of embryos (OR: 1.17, 95% CI: 1.09-1.26) and existence of good/excellent blastocysts on D5 (OR: 17.25, 95% CI: 10.91-27.26) and age (OR: 0.95, 95% CI: 0.90-1.00). The BR between D5 and D6 is important for patients considering fresh ET with a pre-blastocyst on D5. The good BR would guide about their odds of having an embryo for PGT and/or cryopreservation on D6. Number of pre-blastocysts, grading of their sibling blastocysts and fresh ET on D5 positively predict new blastocysts on D6. Older patients with few cultured embryos and no good/excellent blastocyst on D5 are unlikely to have an advanced stage good/excellent blastocyst on D6.Table 1Patient and cycle characteristics.VariableMean ± SD or n (%)*Cultured Embryo Cohort9.80 ± 6.15Age33.54 ± 4.56BMI28.02 ± 6.82White Race914 (90)Gravidity1.03 ± 1.40Parity0.40 ± 0.68AFC24.32 ± 12.86Male Factor Diagnosis351 (34)History of Smoking180 (17)Current Smoker27 (3)Sum of Metaphase 1 & 2 Oocytes13.93 ± 8.21ICSI use600 (58)Pre-Blastocysts on D53.78 ± 3.51Good/Excellent Blastocysts on D52.59 ± 2.99Fresh ET on D5771 (75)*SD: standard deviation Open table in a new tab" @default.
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• W2976475210 date "2019-09-01" @default.
• W2976475210 modified "2023-10-18" @default.
• W2976475210 title "Blastulation and good blastulation between days 5 and 6 of extended embryo culture" @default.
• W2976475210 doi "https://doi.org/10.1016/j.fertnstert.2019.07.446" @default.
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