Risk factors for delayed embryo development - Course ID:59 -
Looking at a cohort of freee-all cycles at a single clinic, a numbe of independent risk factors can be identified to predict whether all the embros cryo-stored were either on time (day 5) or delayed (day 6)in their development.
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References related to Delayed Embryo Development
Additional References related to Delayed Embryo Development - 
Mathilde Bourdon, Lucile Ferreux, Chloé Maignien, Catherine Patrat, Louis Marcellin, Khaled Pocate-Cheriet, Charles Chapron, Pietro Santulli (2020)
Tobacco consumption is associated with slow-growing day-6 blastocysts
F&S Reports, Vol. 1, Issue 1. https://doi.org/10.1016/j.xfre.2020.04.006
Irani M, O'Neill C, Palermo GD, et al. Blastocyst development rate influences implantation and live birth rates of similarly graded euploid blastocysts. Fertil Steril. 2018,110(1):95-102.e1. doi:10.1016/j.fertnstert.2018.03.032
Ferreux L, Bourdon M, Sallem A, et al. Live birth rate following frozen-thawed blastocyst transfer is higher with blastocysts expanded on Day 5 than on Day 6. Hum Reprod. 2018,33(3):390-398. doi:10.1093/humrep/dey004
Tannus S, Cohen Y, Henderson S, et al. Fresh transfer of Day 5 slow-growing embryos versus deferred transfer of vitrified, fully expanded Day 6 blastocysts: which is the optimal approach?. Hum Reprod. 2019,34(1):44-51. doi:10.1093/humrep/dey351