Research from the 2010 Annual European Society of Human Reproduction and Embryology (ESHRE).
My comment is that this information adds to the data suggesting that often the condition causing infertility is what leads to poor outcomes rather than the treatment itself.
So often infertility treatments take the fall for causing pregnancy complications when it may be the disease itself that is the issue.
We saw this play out in the early 1990s with the research suggesting that fertility drugs caused cancer of the ovary. After follow-up research showed that infertile women who did not take fertility drugs also had an increased risk of ovarian cancer, then we realized that infertility was the true risk factor – not the fertility drugs.
Associations are not always the cause of the problems.
The researchers investigated the association between adverse pregnancy outcome, ART, and a previous diagnosis of endometriosis in 1,442,675 single births to Swedish women.
Compared with women without endometriosis, they had a 1.33 greater risk of preterm birth. Women with endometriosis were also more likely to have difficulty in conceiving and need to receive ART.
Among women with endometriosis, the risk of preterm birth was 1.24 with ART, and 1.37 without ART.
Women with endometriosis were also more likely to suffer from pre-eclampsia, and antepartum bleeding the researchers say.