Comparison of Doses of Acetylsalicylic Acid in Women With Previous History of Preeclampsia
Placental insufficiency is the source of preeclampsia (PE) and intrauterine growth retardation (IUGR). Current data demonstrate a significant beneficial effect of prophylactic use of aspirin on the recurrence of placental insufficiency and its complications, mainly preeclampsia, when started early in pregnancy. However, there is a significant heterogeneity in medical practice in Canada and around the world in terms of the dose of aspirin used.
The objectives of this study are: 1) Evaluate whether a dose of 160 mg of aspirin is associated with greater improvement in placental function assessed by biochemistry (sFlt-1 and endoglin) and ultrasound (uterine artery Doppler) than a dose of 80 mg in women with a history of PE, 2) Assess whether the change is dependent on platelet aggregation measured by a test used in several Canadian centers (PFA-100).
|Pre-Eclampsia Fetal Growth Retardation Premature Birth Placental Insufficiency||Drug: Acetylsalicylic Acid||Phase 4|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
|Official Title:||Evaluation of Dose-response Effect of Acetylsalicylic Acid on Placental Development, Preterm Birth, Fetal Growth and Hypertension in Pregnancy in Women With Previous History of Preeclampsia|
- Placental function [ Time Frame: 22nd week of gestation ]We chose a continuous intermediate variable focused on the aetiology, the placental function, assessed by Doppler ultrasound: the average pulsatility index of uterine arteries (UTAP - primary outcome) at 22 weeks of gestation
- Rates of pregnancy complications related to placental insufficiency (preeclampsia, IUGR, premature birth) [ Time Frame: At delivery ]The effectiveness of treatment on the rate of preterm delivery, hypertensive disorders of pregnancy and IUGR will also be measured by reviewing medical records. All cases with a diagnosis of preterm labor, gestational hypertension or IUGR <10th percentile will be reviewed by a specialist in maternal fetal medicine at blindness for allocation.
|Study Start Date:||September 2011|
|Study Completion Date:||March 2015|
|Primary Completion Date:||December 2014 (Final data collection date for primary outcome measure)|
Experimental: Group A
Acetylsalicylic Acid 160mg administered at bedtime
Drug: Acetylsalicylic Acid
Capsule containing Acetylsalicylic Acid 160mg pill with lactose
Active Comparator: Group B
Acetylsalicylic Acid 80mg administered at bedtime
Drug: Acetylsalicylic Acid
Capsule containing Acetylsalicylic Acid 80mg pill with lactose
Many studies suggest that aspirin (acetylsalicylic acid) at low dose significantly reduces the incidence of preeclampsia. More recent data have shown that, when administered before 16 weeks of pregnancy, aspirin can prevent over 50% of preeclampsia, severe preeclampsia, and IUGR but also a significant proportion of the rate of preterm births. Current data also demonstrate a beneficial effect of prophylactic use of aspirin when started early in pregnancy in populations composed of high-risk patients with a history of preeclampsia and / or other pregnancy complications related to poor placental function.
Beside, many clinicians are already using aspirin in the context of a proven benefit. However, the usual dose prescribed in Canada today is 80 mg while the most favorable studies have used a slightly higher dose of aspirin (100 mg).
Moreover, it has been demonstrated that the time of day during which aspirin was administered was also a very important factor regarding the effect on blood pressure and adverse outcomes of the majority of pregnancy. Yet the majority of studies in this context have not specified the time of day at which aspirin was or had been taken, possibly underestimating the effect thereof.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01352234
|Centre Hospitalier Universitaire de Québec (CHUQ)/Pavillon CHUL|
|Québec, Quebec, Canada, G1V 4G2|
|Principal Investigator:||Emmanuel Bujold, MD, MSc||CHU de Quebec-Universite Laval|