Giving low dose aspirin to high-risk women reduced their risk of pre-eclampsia before 37 weeks of pregnancy. Preterm pre-eclampsia developed in 1.6% of women given 150mg aspirin daily compared with 4.3% who took a placebo.
Pre-eclampsia is a condition which can harm mother and baby. In the mother, it causes high blood pressure and protein in the urine, which can show in pregnancy after 20 weeks. Women with risk factors, such as previous pre-eclampsia, diabetes or high blood pressure, are often prescribed 75mg aspirin from 12 weeks onwards. This study aimed to test double this dose (still classified as a `low dose’) after using a new risk assessment with additional clinical tests to better identify those at high risk of the condition. Aspirin did not affect other pregnancy outcomes and didn’t increase the risk of adverse effects.
This research adds to current knowledge about the range of doses that is effective and refines the definition and detection of women at high risk. The research did not compare 75mg with 150mg doses.
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