RESUMEN
Objective To explore the clinical value of second polar body (Pb2) exclusion monitoring by timelapse in predicting the fertilization and embryo development efficiency for intracytoplasmic sperm injection ( ICSI). Methods A retrospective research was performed on 278 patients treated with ICSI, the clinical data and Time-lapse monitoring embryo culture data were collected and analyzed, to explore the exclusion of Pb2 after ICSI and the relationship between the specific exclusion time and the outcome of fertilization and embryo development. Results The average time of Pb2 exclusion after ICSI was ( 3. 03 ± 1. 21) hours; The fertilization rate, 2 pronucleus(PN) fertilization rate and 5 days ( D5) blastocyst formation rate in the Pb2 exclusion group were significantly higher than those in the without Pb2 exclusion group (99.95% vs f. 75%, P 3-4 hours group was significantly higher than that in 0-2 hours group and >5 hours group (98.80% vs 9 3 . 8 1 % , P 2-3 hours group ( 56. 23% vs 67. 23%, P 4-5 hours group was significantly lower than 0-2 hours group and >2-3 hours group ( 46. 6f % vs 62. 30% , P5 hours group was 7. f 4 % , which were significantly lower than that of the other four groups (P 2-3 hours group ( 9. 92% vs 16. 39% , P 4-5 hours group was significantly lower than that in > 2-3 hours group (11. 02% vs 20.72%, P<0. 05). Conclusion Monitoring Pb2 exclusion by Time-lapse can accurately predict fertilization outcome. The time of Pb2 exclusion is significantly correlated with embiyo development potential. It is a valuable morphological index to predict fertilization and embiyo development outcome in ICSI.