Embryo transfer based on previous uterine length measurement enhances ICSI outcomes when compared to standard ultrasonographic-guided embryo transfer

OBJECTIVE: To test the hypothesis that embryo transfer based on previous uterine length measurement is a better method to improve pregnancy rates when compared to the standard ultrasonographic- guided embryo transfer method. METHODS: Patients undergoing Controlled Ovarian Stimulation (COS) for Intracytoplasmic Sperm Injection (ICSI) cycles were allocated into two groups based on embryo transfer method used. Cycles in which embryo transfer was performed based on previous uterine length measurement (ULM group, n=50) and cycles in which embryo transfer was performed though standard ultrasonographic- guidance (Control group, n=150). The easiness of transfer, implantation and pregnancy rates were compared among the groups using the Student's t test and Chi-squared or Fisher exact tests as appropriate. RESULTS: Similar results were found between groups regarding the easiness of transfer. Both implantation (11.9% vs 30.7% for Control and ULM groups respectively, p<0,001) and pregnancy rates (26.0% vs 54.0% for Control and ULM groups respectively, p<0,001) were significantly higher in the ULM group. CONCLUSION: Ultrasound guided embryo transfer based on previous uterine length measurement is useful to increase the pregnancy and implantation rates in patients submitted to COS and ICSI cycles.