• Zhiqin Bu, Yujing Xiong, Keyan Wang, and Yingpu Sun.
• Reproductive Medical Center, First Affiliated Hospital of Zhengzhou University, Zhengzhou, People's Republic of China.
• Fertil. Steril. 2016 Jul 1; 106 (1): 90-94.

ObjectiveTo explore factors affecting the incidence of ectopic pregnancy (EP) in assisted reproductive technology (ART).DesignA retrospective cohort study on the incidence of EPs in IVF/intracytoplasmic sperm injection (ICSI) and IUI cycles from June 2009 to August 2015. Age of patients, tubal factor infertility, type of cycle (fresh or thawed), embryo being transferred (cleavage embryo or blastocyst), and number of embryos transferred were analyzed to explore their relationship with the incidence of EP.SettingTeaching hospital.Patient(S)A total of 18,432 pregnancies resulting from ART treatment were retrospectively analyzed.Intervention(S)None.Main Outcome Measure(S)Ectopic pregnancy rate.Result(S)For IVF/ICSI cycles, the incidence of EP was different between cycles transferred with cleavage embryo and blastocyst (3.45% vs. 2.47%). In multivariate logistic regression analysis, tubal infertility was associated with EP (adjusted odds ratio 1.716, 95% confidence interval 1.444-2.039). For IUI cycles, EP was significantly higher in stimulated cycles compared with natural cycles (2.62% vs. 0.99%). The EP rate in cycles with sperm from donor and husband was 1.08% and 3.54%, respectively. However, when patients were stratified according to tubal infertility, the EP rate increased with level of peak estrogen. In thawed embryo transfer cycles, the EP rate was lower in blastocyst transfer cycles and in cycles transferred with fewer embryos.Conclusion(S)Irrespective of tubal infertility, for fresh IVF/ICSI cycles the rate of EP is positively associated with ovarian stimulation; for thawed IVF/ICSI cycles, blastocyst transfer or transfer with fewer embryos reduces the EP rate. In IUI cycles, EP is associated with sperm source.Copyright © 2016 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.

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