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• W2014724103 abstract "ObjectiveTo evaluate embryo development after oocyte vitrification from a morphokinetic stand point.DesignObservational cohort study from January 2010 to July 2012.Materials and MethodsOvum donation cycles with either vitrified (n=631 cycles; n=3794 embryos) or fresh oocytes (n=1359 cycles; n=9936 embryos) where embryo development was analyzed with time-lapse imaging. Variables studied were: timing to two cells(t2), three cells(t3), four cells(t4), five cells(t5), morula(tM) and cavited, early and hatching blastocyst(tB, tEB,tHB) and the length of the second cell cycle (cc2). Embryos were classified according to hierarchical tree model. Statistics:ANOVA or X2 including CI95% (expresed within parentheses in results section).ResultsA delay of approximately 1 hour in t2: 27.7h (27.6-27.8) vs. 28.7h (28.5-28.9), t3: 37.8h (37.6-37.9) vs. 38.9 (38.5-38.9), t4: 40.2h (40.1-40.3) vs. 41.4h (41.2-41.7), t5: 50.5h (50.3-50.7) vs. 51.7h (51.4-52.1), tM: 86.6h (86.1-87.1) vs. 88.5h (87.5-89.4) and tB: 103.4h (103-103.9) vs. 104.5h (103.7-105.4) was observed in the vitrified group(P<0.05). No differences were observed in tEB: 114.4h (113.8-114.9) vs. 114.8h (113.7-115.9), tH: 114.9h (113.4-116.4) vs. 116.9 (113.8-120) and cc2: 10.2h (10.1-10.3) vs. 10.2h (10.0-10.4) between fresh and vitrified groups respectively (NS). The proportion of embryos allocated in categories A-E in the hierarchical tree was similar between groups (NS). Implantation rate was 51.3% (47.1-55.7) and 46.4 (38.4-54.4) in fresh and vitrified groups(NS).ConclusionEmbryo quality of vitrified oocytes was not impaired since the duration of the 2nd cell cycle, the quality according to our hierarchical morphokinetic model and the implantation rate were similar between fresh and vitrified oocytes, although morphokinetic differences were observed from t2 to tB. The delay in timing for cell division may be due to a delay in rearming oocytes’ machinery responsible for these events, caused by the intermediate step of vitrification/warming. ObjectiveTo evaluate embryo development after oocyte vitrification from a morphokinetic stand point. To evaluate embryo development after oocyte vitrification from a morphokinetic stand point. DesignObservational cohort study from January 2010 to July 2012. Observational cohort study from January 2010 to July 2012. Materials and MethodsOvum donation cycles with either vitrified (n=631 cycles; n=3794 embryos) or fresh oocytes (n=1359 cycles; n=9936 embryos) where embryo development was analyzed with time-lapse imaging. Variables studied were: timing to two cells(t2), three cells(t3), four cells(t4), five cells(t5), morula(tM) and cavited, early and hatching blastocyst(tB, tEB,tHB) and the length of the second cell cycle (cc2). Embryos were classified according to hierarchical tree model. Statistics:ANOVA or X2 including CI95% (expresed within parentheses in results section). Ovum donation cycles with either vitrified (n=631 cycles; n=3794 embryos) or fresh oocytes (n=1359 cycles; n=9936 embryos) where embryo development was analyzed with time-lapse imaging. Variables studied were: timing to two cells(t2), three cells(t3), four cells(t4), five cells(t5), morula(tM) and cavited, early and hatching blastocyst(tB, tEB,tHB) and the length of the second cell cycle (cc2). Embryos were classified according to hierarchical tree model. Statistics:ANOVA or X2 including CI95% (expresed within parentheses in results section). ResultsA delay of approximately 1 hour in t2: 27.7h (27.6-27.8) vs. 28.7h (28.5-28.9), t3: 37.8h (37.6-37.9) vs. 38.9 (38.5-38.9), t4: 40.2h (40.1-40.3) vs. 41.4h (41.2-41.7), t5: 50.5h (50.3-50.7) vs. 51.7h (51.4-52.1), tM: 86.6h (86.1-87.1) vs. 88.5h (87.5-89.4) and tB: 103.4h (103-103.9) vs. 104.5h (103.7-105.4) was observed in the vitrified group(P<0.05). No differences were observed in tEB: 114.4h (113.8-114.9) vs. 114.8h (113.7-115.9), tH: 114.9h (113.4-116.4) vs. 116.9 (113.8-120) and cc2: 10.2h (10.1-10.3) vs. 10.2h (10.0-10.4) between fresh and vitrified groups respectively (NS). The proportion of embryos allocated in categories A-E in the hierarchical tree was similar between groups (NS). Implantation rate was 51.3% (47.1-55.7) and 46.4 (38.4-54.4) in fresh and vitrified groups(NS). A delay of approximately 1 hour in t2: 27.7h (27.6-27.8) vs. 28.7h (28.5-28.9), t3: 37.8h (37.6-37.9) vs. 38.9 (38.5-38.9), t4: 40.2h (40.1-40.3) vs. 41.4h (41.2-41.7), t5: 50.5h (50.3-50.7) vs. 51.7h (51.4-52.1), tM: 86.6h (86.1-87.1) vs. 88.5h (87.5-89.4) and tB: 103.4h (103-103.9) vs. 104.5h (103.7-105.4) was observed in the vitrified group(P<0.05). No differences were observed in tEB: 114.4h (113.8-114.9) vs. 114.8h (113.7-115.9), tH: 114.9h (113.4-116.4) vs. 116.9 (113.8-120) and cc2: 10.2h (10.1-10.3) vs. 10.2h (10.0-10.4) between fresh and vitrified groups respectively (NS). The proportion of embryos allocated in categories A-E in the hierarchical tree was similar between groups (NS). Implantation rate was 51.3% (47.1-55.7) and 46.4 (38.4-54.4) in fresh and vitrified groups(NS). ConclusionEmbryo quality of vitrified oocytes was not impaired since the duration of the 2nd cell cycle, the quality according to our hierarchical morphokinetic model and the implantation rate were similar between fresh and vitrified oocytes, although morphokinetic differences were observed from t2 to tB. The delay in timing for cell division may be due to a delay in rearming oocytes’ machinery responsible for these events, caused by the intermediate step of vitrification/warming. Embryo quality of vitrified oocytes was not impaired since the duration of the 2nd cell cycle, the quality according to our hierarchical morphokinetic model and the implantation rate were similar between fresh and vitrified oocytes, although morphokinetic differences were observed from t2 to tB. The delay in timing for cell division may be due to a delay in rearming oocytes’ machinery responsible for these events, caused by the intermediate step of vitrification/warming." @default.
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• W2014724103 title "Time-lapse analysis of vitrified oocytes: morphokinetic evaluation of embryo quality" @default.
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