R Azambuja, L Okada, V Reig, A Tagliani- Ribeiro, D Kvitko, M Badalotti
JBRA Assist. Reprod. 2013; 17 (2):129-130
Received November 16, 2013
Accepted November 16, 2013
Abstract
OBJECTIVE: This is a retrospective cohort study with only cycles transferring blastocysts embryos from fresh (150) or frozen (69) cycles, from 2012 to 2013. The objective was to compare the pregnancy rates of transferred blastocysts derived from fresh or frozen cycles.
METHODS: The results of blastocyst transfer cycles were evaluated. The mean age of patients in the fresh cycle and FET (frozen embryo transfer) were 34.2 and 34.6, respectively. The technique of cryopreservation was vitrification (Kuwayama et al. 1998). Statistical analysis was performed using Fisher’s exact test (p <0.05).
RESULTS: The number of embryos transferred in both groups (fresh and FET) were 313 and 125, respectively, with an average of 2.1 and 1.8 per patient. The rates of pregnancies and clinical pregnancies were 49.3% and 44.7% for fresh embryos and 52.0% and 46.4% when transferring frozen/thawed blastocysts respectively. No statistically significant difference (p> 0.05) was observed.
CONCLUSION: Our data suggest that frozen blastocyst transfer does not reduce the chances of pregnancy.
