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Prophylactic Aspirin Dose and Preeclampsia.

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This study found no difference in preeclampsia incidence or bleeding complications between pregnant women taking 150-160 mg or 75 mg of aspirin. Both aspirin doses appear equally effective for preeclampsia prevention.

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Area of Science:

  • Obstetrics and Gynecology
  • Pharmacology
  • Epidemiology

Background:

  • Preeclampsia is a significant cause of maternal and fetal morbidity.
  • Low-dose aspirin is commonly used for preeclampsia prevention, but optimal dosage remains debated.
  • Higher aspirin doses (150-160 mg) are sometimes used, but their efficacy and safety compared to lower doses (75 mg) are not well-established.

Purpose of the Study:

  • To compare the incidence of preeclampsia and postpartum hemorrhage between pregnant women receiving 150-160 mg of aspirin versus 75 mg of aspirin.
  • To evaluate the safety and efficacy of different low-dose aspirin regimens for preeclampsia prevention.

Main Methods:

  • A nationwide cohort study in Sweden included 13,828 women receiving low-dose aspirin (75-160 mg) from 2017-2020.
  • Preeclampsia diagnosis and postpartum hemorrhage were the primary outcomes.
  • Doubly robust inverse probability-weighted regression adjustment was used to estimate relative risks.

Main Results:

  • No significant difference in preeclampsia incidence was observed between the 150-160 mg aspirin group (9.5%) and the 75 mg group (8.9%).
  • Postpartum hemorrhage rates were also similar between the groups (6.9% vs. 6.4%).
  • Adjusted relative risks for preeclampsia and postpartum hemorrhage showed no significant difference between the two aspirin doses.

Conclusions:

  • This study suggests that both 150-160 mg and 75 mg doses of aspirin are comparable in preventing preeclampsia and do not significantly differ in causing postpartum hemorrhage.
  • Either dose may be a reasonable choice for aspirin prophylaxis in pregnancy.
  • Further large-scale randomized controlled trials are warranted to definitively establish the optimal aspirin dosage for preeclampsia prevention.