London: Women who become pregnant through In vitro fertilisation (IVF) may be more likely to develop life-threatening blood clots, scientists have found in a first-of-its-kind study. The risk rose fivefold in early pregnancy compared with women who conceived naturally, researchers found. IVF is linked to more cases of pulmonary embolism, in which a blood clot causes a blockage in the main artery of the lung, and venous thromboembolism - blood clots which form elsewhere but can break off and become life threatening. The researchers believe doctors should be aware of the danger, saying the number of cases remains small but blood clots on the lung are a leading cause of death in pregnant women, the `Daily Mail` reported. They suggest the reason may be a huge rise in oestrogen levels triggered by IVF drugs, with the effect diminishing later in pregnancy.
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