OBJECTIVE: This study was undertaken to see if embryo transfer containing early cleavage embryos resulted in better clinical pregnancy rate. METHODS: The treatment outcomes of IVF-ET were retrospectively reviewed. Out of 258 transfer cycles, 160 cycles contained no early cleavage embryos (Group I) and 98 cycles contained at least one early cleavage embryo (Group II). The definition of early cleavage embryo is the presence of two blastomeres 24-26 h after insemination. The implantation rate, clinical pregnancy rate were compared between two groups. Student's t-test and the Mann-Whitney U-test were used for continuous variables, and the Chi-squared (chi(2)) test was used for binary variables. Differences were considered statistically significant at P<0.05. RESULT: The implantation rate and clinical pregnancy rate were 11.6% and 25.6% in Group I, 18.6% and 38.8% in Group II (P<0.05). CONCLUSION: Early cleavage embryos possess greater implantation potential. Embryo transfer containing early cleavage embryos had a better clinical pregnancy rate.
OBJECTIVE: This study was undertaken to see if embryo transfer containing early cleavage embryos resulted in better clinical pregnancy rate. METHODS: The treatment outcomes of IVF-ET were retrospectively reviewed. Out of 258 transfer cycles, 160 cycles contained no early cleavage embryos (Group I) and 98 cycles contained at least one early cleavage embryo (Group II). The definition of early cleavage embryo is the presence of two blastomeres 24-26 h after insemination. The implantation rate, clinical pregnancy rate were compared between two groups. Student's t-test and the Mann-Whitney U-test were used for continuous variables, and the Chi-squared (chi(2)) test was used for binary variables. Differences were considered statistically significant at P<0.05. RESULT: The implantation rate and clinical pregnancy rate were 11.6% and 25.6% in Group I, 18.6% and 38.8% in Group II (P<0.05). CONCLUSION: Early cleavage embryos possess greater implantation potential. Embryo transfer containing early cleavage embryos had a better clinical pregnancy rate.