Risk Factors for Ectopic Pregnancy: Comparison of Fresh and Warmed Transfers. Analysis of a 10 Years, a Single Center Experience.

Ectopic pregnancy (EP) remain a leading cause of maternal death during the first trimester of pregnancy. Previous studies have reported an increased incidence of EP in Assisted reproductive technologies techniques (ART) (Clayton et al., 2006), and in particular with fresh blastocyst embryo transfer compared with warmed embryo transfer (Londra et al., 2015). However a metanalysis on the topic argued that the results of many studies vary significantly within years of publishing and center locations; therefore, an accurate management strategy for patients at risk of ectopic gestation after invitro fertilization and embryo transfer (IVF-ET) procedure has not been established(V. Muller et al., 2016). In addition literature on I level ART procedures appears to be lacking. In consideration of the widespread use of ART techniques in gynaecology and the high morbidity and mortality associated with EP, providing further insight into the risk factors associated with EPs in ART appears of great relevance. Indeed, revising EP risk factors may help in reducing EP incidence in ART through the stratification of women according to their characteristics and the employment of special measures.

The objective of this study is to compare the incidences of EPs in all ART procedures (both I and II level) in a single, third level ART center throughout a 10-year period. In addition, we also aim to revise recognized EP's risk factors among patients undergoing these procedure and to evaluate their impact in determining extrauterine implantation.