evaluation the effect of low?dose aspirin on endothelial dysfunction in preeclamptic patients

background: preeclampsia complicates up to 3% of pregnancies in developing countries. endothelial dysfunction plays an important role in pathogenesis of preeclampsia. in this study, we aim to evaluate the effect of low?dose aspirin on endothelial dysfunction in preeclamptic patients. materials and methods: in this triple?blind randomized clinical trial, enrolled patients were divided randomly into two groups. acetylsalicylic acid (asa) 80 mg or placebo will be taken daily by oral administration from the initiation of diagnosis until 2 months after delivery. every patient’s flow?mediated dilation (fmd) were evaluated at the beginning of study and 2 months after delivery with the same experienced operator at a same period of the time (3–5 pm) by high?resolution b?mode ultrasonographic. t ?test or  mann–whitney test was used in the comparison of means between the intervention and placebo groups. to compare fmd in each group, before and after the intervention, paired t ?test was used. results: mean value of fmd in intervention (9.61 ± 5.58) and control group (9.40 ± 4.33) have no significant differences before drug consumption ( p = 0.089). fmd in intervention group significantly increased after asa consumption ([9.61 ± 5.58 vs. 13.65 ± 7.91] [ p = 0.044]). conclusion: increase mean of fmd in intervention group shows that this supplement can improve endothelial function.