In Vitro Fertilization Pregnancy Outcomes and Effect of Atosiban Among Women With Endometriosis in Presence or Absence of Adenomyosis
Abstract BackgroundThe use of atosiban during embryo transfer (ET), an oxytocin receptor antagonist, has been demonstrated to enhance pregnancy rate among infertile patients with endometriosis. However, its efficacy has not been assessed among those with concurrent adenomyosis, which may further affect pregnancy rate.MethodsThis retrospective cohort study assessed in vitro fertilization (IVF) pregnancy, and the effect of atosiban among 34 women with both endometriosis and adenomyosis (with 66 ET cycles), compared to 34 endometriosis patients without adenomyosis (with 54 ETs) and 38 patients with tubal factor (with 56 ETs). Multivariable logistic generalized estimating equation analyses were performed to assess pregnancy outcomes with adjustment for maternal and treatment characteristics.ResultsSignificantly higher chances of biochemical pregnancy and live birth among endometriosis patients without adenomyosis versus those with both endometriosis and adenomyosis were found (odds ratios [95% confidence intervals]: 2.981 [1.307, 6.803]; p=0.009, 2.694 [1.151, 6.304]; p=0.022). A significant positive association between atosiban use and biochemical pregnancy existed among endometriosis cases without adenomyosis (a 2.43-fold [1.01, 5.89] increase in successful pregnancy; p<0.05), but not for the other groups. An insignificant increase in pregnancy rates was found for atosiban-treated extensive adenomyosis cases (i.e., ≥50%) versus non-treated cases (biochemical pregnancy, ongoing pregnancy, and live birth: 42.9% versus 33.3%, 37.5% versus 14.3%, and 25.0% versus 14.3%, respectively).ConclusionsPoor pregnancy outcomes among adenomyosis-affected women were confirmed. The use of atosiban significantly enhanced IVF pregnancy among endometriosis patients without adenomyosis. Atosiban use might benefit those with more extensive adenomyosis.