Covid-19 may increase risk of blood clots in pregnant women, say scientists

Covid-19 may increase the risk of blot clots in pregnant women, or in those taking estrogen with birth control or hormone replacement therapy, say scientists who call for the development of innovative animal experiment models to further study this association.

According to the researchers, including those from the Tufts University School of Medicine in the US, one of the many complications of Covid-19 is the formation of blood clots in previously healthy people.

They said the female hormone estrogen also increases the chance of blood clots during pregnancy and in women taking birth control pills or hormone replacement therapy.

If infected with Covid-19, the risk of blood clotting could be even higher, and these women may need to undergo anticoagulation therapy, or discontinue their estrogen medicines, noted the research, published in the journal Endocrinology.

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The scientists believe further research is needed to understand the effects of the novel coronavirus on coagulation, answering if the virus aggravates the risk of blood clots and strokes associated with oral contraceptive pills, other estrogen therapies, and pregnancy-associated risks.

"During this pandemic, we need additional research to determine if women who become infected with the coronavirus during pregnancy should receive anticoagulation therapy, or if women taking birth control pills or hormone replacement therapy should discontinue them," said Daniel Spratt, the study's corresponding author from Tufts University School of Medicine in Boston, US.

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"Research that helps us understand how the coronavirus causes blood clots may also provide us with new knowledge regarding how blood clots form in other settings and how to prevent them," Spratt said.

However, the scientists said understanding the cause of blood clotting in Covid-19, including the intersecting effects of estrogen therapy or pregnancy, has several hurdles and will require innovative animal and tissue models.

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"The emergence of this pandemic and the curious impact of this virus on hypercoagulability emphasise the continuing need for additional research into coagulation pathology in women," they wrote in the study.

According to the researchers, collaborative efforts between clinicians and basic researchers, and between endocrinologists and haematologists are necessary to understand the interactions between the novel coronavirus and pregnancy or estrogen therapy that could guide clinical management.