Previous abortion is a positive predictor for ongoing pregnancy in the next cycle in women with repeated IVF failures

Early pregnancy loss is common among women treated with assisted reproduction treatment, but whether it is a prognostic factor for success in subsequent IVF cycles is not well established. The aim of this study was to determine whether a biochemical pregnancy (BP) or spontaneous abortion (SA) affects the pregnancy rates in the following cycle. A retrospective study of 2687 women undergoing 6678 cycles between January 1998 and March 2010 was performed. Ongoing pregnancy rate (PR) per cycle was compared between patients with a pregnancy loss versus a negative β-HCG in their previous cycles. Multivariate analysis of factors affecting ongoing pregnancy rate was performed. BP and/or SA in the first three cycles did not significantly alter the chances to conceive (16.9% patients with BP and/or SA in the previous cycle versus 16.5% patients with no previous pregnancy). From cycle 4 onwards, the presence of a previous abortion (either BP or SA) was associated with better ongoing PR (23.0% versus 11.2%, P<0.001). In conclusion, BP and/or SA in a previous cycle appears to be a positive marker for success in subsequent cycles in patients with repeated IVF failures. These results should be further investigated in this challenging group of patients.